

[Federal Register: March 29, 2006 (Volume 71, Number 60)]
[Rules and Regulations]               
[Page 15589-15597]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr29mr06-11]                         


[[Page 15589]]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 82

[EPA-HQ-OAR-2003-0118; FRL-8050-9]
RIN 2060-AG12

 
Protection of Stratospheric Ozone: Notice 20 for Significant New 
Alternatives Policy Program

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of acceptability.

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SUMMARY: This Notice of Acceptability expands the list of acceptable 
substitutes for ozone-depleting substances (ODS) under the U.S. 
Environmental Protection Agency's (EPA) Significant New Alternatives 
Policy (SNAP) program. The substitutes are for use in the following 
sectors: refrigeration and air conditioning, foam blowing, and fire 
suppression and explosion protection. The determinations concern new 
substitutes.

DATES: This notice of acceptability is effective on March 29, 2006.

ADDRESSES: EPA has established a docket for this action under Docket ID 
No. EPA-HQ-OAR-2003-0118 (continuation of Air Docket A-91-42). All 
electronic documents in the docket are listed in the index at http://www.regulations.gov.
 Although listed in the index, some information is 

not publicly available, i.e., CBI or other information whose disclosure 
is restricted by statute. Publicly available docket materials are 
available either electronically at http://www.regulations.gov or in hard copy 

at the EPA Air Docket (No. A-91-42), EPA/DC, EPA West, Room B102, 1301 
Constitution Ave., NW., Washington, DC. The Public Reading Room is open 
from 8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal 
holidays. The telephone number for the Public Reading Room is (202) 
566-1744, and the telephone number for the Air Docket is (202) 566-
1742.

FOR FURTHER INFORMATION CONTACT: Evelyn Swain by telephone at (202) 
343-9956, by facsimile at (202) 343-2342, by e-mail at 
swain.evelyn@epa.gov, or by mail at U.S. Environmental Protection 

Agency, Mail Code 6205J, 1200 Pennsylvania Avenue, NW., Washington, DC 
20460. Overnight or courier deliveries should be sent to the office 
location at 1310 L Street, NW., 8th floor, Washington, DC 20005.
    For more information on the Agency's process for administering the 
SNAP program or criteria for evaluation of substitutes, refer to the 
original SNAP rulemaking published in the Federal Register on March 18, 
1994 (59 FR 13044). Notices and rulemakings under the SNAP program, as 
well as other EPA publications on protection of stratospheric ozone, 
are available at EPA's Ozone Depletion World Wide Web site at http://www.epa.gov/ozone/ including the SNAP portion at http://www.epa.gov/

ozone/snap/.

SUPPLEMENTARY INFORMATION:

I. Listing of New Acceptable Substitutes
    A. Refrigeration and Air Conditioning
    B. Foam Blowing
    C. Fire Suppression and Explosion Protection
II. Section 612 Program
    A. Statutory Requirements
    B. Regulatory History
Appendix A--Summary of Decisions for New Acceptable Substitutes

I. Listing of New Acceptable Substitutes

    This section presents EPA's most recent acceptable listing 
decisions for substitutes in the following industrial sectors: 
refrigeration and air conditioning, foam blowing, and fire suppression 
and explosion protection. For copies of the full list of ODS 
substitutes in all industrial sectors, visit EPA's Ozone Depletion Web 
site at http://www.epa.gov/ozone/snap/lists/index.html.

    The sections below discuss each substitute listing in detail. 
Appendix A contains a table summarizing today's listing decisions for 
new substitutes. The statements in the ``Further Information'' column 
in the table provide additional information, but are not legally 
binding under section 612 of the Clean Air Act. In addition, the 
``further information'' may not be a comprehensive list of other legal 
obligations you may need to meet when using the substitute. Although 
you are not required to follow recommendations in the ``further 
information'' column of the table to use a substitute, EPA strongly 
encourages you to apply the information when using these substitutes. 
In many instances, the information simply refers to standard operating 
practices in existing industry and/or building-code standards. Thus, 
many of these statements, if adopted, would not require significant 
changes to existing operating practices.
    Submissions to EPA for the use of the substitutes listed in this 
document may be found under category VI-D of EPA air docket A-91-42 at 
the address described above under ADDRESSES. You can find other 
materials supporting the decisions in this action under category IX-B 
of EPA docket A-91-42 and in e-docket EPA-HQ-OAR-2003-0118 at http://www.regulations.gov
.


A. Refrigeration and Air Conditioning

1. ICOR AT-22
    EPA's decision: ICOR AT-22 [R-125/290/134a/600a (55.0/1.0/42.5/
1.5)] is acceptable for use in new and retrofit equipment as a 
substitute for HCFC-22 in:

 Chillers (centrifugal, screw, reciprocating)
 Industrial process refrigeration
 Industrial process air conditioning
 Retail food refrigeration
 Cold storage warehouses
 Refrigerated transport
 Commercial ice machines
 Ice skating rinks
 Household refrigerators and freezers
 Vending machines
 Water coolers
 Residential dehumidifiers
 Non-mechanical heat transfer
 Household and light commercial air conditioning and heat pumps
 Very low temperature refrigeration

    ICOR AT-22 is a blend of 55.0% by weight HFC-125 
(pentafluoroethane, Chemical Abstracts Service Registry Number (CAS) ID 
354-33-6), 1.0% by weight R-290 (propane, CAS ID 74-
98-6), 42.5% by weight HFC-134a (1,1,1,2-tetrafluoroethane, CAS ID 
811-97-2), and 1.5% by weight isobutane (2-methyl propane, CAS 
ID 75-28-5). You may find the submission under EPA Air Docket 
A-91-42, item VI-D-310.
    Environmental information: The ozone depletion potential (ODP) of 
ICOR AT-22 is zero. The global warming potentials (GWPs) of HFC-125 and 
HFC-134a are 3450 and 1320, respectively (relative to carbon dioxide, 
using a 100-year time horizon (United Nations Environment Programme 
(UNEP)) and World Meteorological Organization ((WMO) Scientific 
Assessment of Ozone Depletion: 2002). The atmospheric lifetimes of 
these constituents are 29 and 14 years, respectively.
    HFC-125 and HFC-134a are excluded from the definition of volatile 
organic compound (VOC) under Clean Air Act regulations (see 40 CFR 
51.100(s)) addressing the development of State implementation plans 
(SIPs) to attain and maintain the national ambient air quality 
standards.
    EPA is concerned with the relatively high GWP of this substitute. 
The contribution of this blend to greenhouse gas emissions will be 
minimized through the implementation of the venting prohibition under 
section 608 (c)(2) of the Clean Air Act (see 40 CFR, part 82, subpart 
F). This section and EPA's implementing regulations

[[Page 15590]]

prohibit venting or release of substitutes for class I or class II 
ozone ODSs used in refrigeration and air conditioning and require 
proper handling, such as recycling or recovery, and disposal of these 
substances.
    Flammability information: While two of the blend components, 
isobutane and propane, are flammable, the blend as formulated and under 
worst case fractionated formulation scenarios is not flammable.
    Toxicity and exposure data: HFC-125 and HFC-134a have 8 hour/day, 
40 hour/week workplace environmental exposure limits (WEELs) of 1000 
ppm established by the American Industrial Hygiene Association (AIHA). 
Isobutane and propane have an 8 hour/day, 40 hour/week threshold limit 
value (TLV) established by the American Conference of Governmental 
Industrial Hygienists (ACGIH) of 1000 ppm and 2500 ppm, respectively. 
EPA recommends that users follow all requirements and recommendations 
specified in the Material Safety Data Sheet (MSDS) for the blend and 
the individual components and other safety precautions common in the 
refrigeration and air conditioning industry. EPA also recommends that 
users of ICOR AT-22 adhere to the AIHA's WEELs and the ACGIH's TLV.
    Comparison to other refrigerants: ICOR AT-22 is not an ozone 
depleter; thus, it poses a lower risk for ozone depletion than HCFC-22, 
the ozone-depleting substance (ODS) it replaces. ICOR AT-22 has a GWP 
of about 2500, slightly higher than other substitutes for HCFC-22. For 
example, the GWP of R-407C is about 1700 and the GWP of R-410A is about 
2000. Flammability and toxicity risks are low, as discussed above. 
Thus, we find that ICOR AT-22 is acceptable because it does not pose a 
greater overall risk to public health and the environment in the end 
uses and applications listed above.
2. ICOR XLT1 (R-422C)
    EPA's decision: ICOR XLT1 [R-125/134a/600a (82/15/3)] is acceptable 
for use in new and retrofit equipment as a substitute for HCFC-22, R-
502, R-402A, R-402B, and R-408A in:
 Chillers (centrifugal, screw, reciprocating)
 Industrial process refrigeration
 Industrial process air conditioning
 Retail food refrigeration
 Cold storage warehouses
 Refrigerated transport
 Commercial ice machines
 Ice skating rinks
 Household refrigerators and freezers
 Vending machines
 Water coolers
 Residential dehumidifiers
 Non-mechanical heat transfer
 Household and light commercial air conditioning and heat pumps
 Very low temperature refrigeration

    ICOR XLT1 is a blend of 82% by weight HFC-125 (pentafluoroethane, 
CAS ID  354-33-6), 15% by weight HFC-134a (1,1,1,2-
tetrafluoroethane, CAS ID 811-97-2), and 3% by weight 
isobutane (2-methyl propane, CAS ID 75-28-5). The American 
Society of Heating, Refrigerating, and Air Conditioning Engineers 
(ASHRAE) Standard 34 has designated this blend as R-422C. You may find 
the submission under EPA Air Docket A-91-42, item VI-D-313.
    Environmental information: The ODP of ICOR XLT1 is zero. For 
environmental information on the components of this blend see the 
section on environmental information above for ICOR AT-22.
    HFC-125 and HFC-134a are excluded from the definition of volatile 
organic compound (VOC) under Clean Air Act regulations (see 40 CFR 
51.100(s)) addressing the development of State implementation plans 
(SIPs) to attain and maintain the national ambient air quality 
standards.
    EPA is concerned with the relatively high GWP of this substitute. 
The contribution of this blend to greenhouse gas emissions will be 
minimized through the implementation of the venting prohibition under 
section 608 (c)(2) of the Clean Air Act (see 40 CFR, part 82, subpart 
F). This section and EPA's implementing regulations prohibit venting or 
release of substitutes for class I or class II ozone ODSs used in 
refrigeration and air conditioning and require proper handling, such as 
recycling or recovery, and disposal of these substances.
    Flammability information: While one component of the blend, 
isobutane, is flammable, the blend as formulated and under worst case 
fractionated formulation scenarios is not flammable.
    Toxicity and exposure data: For information on the workplace 
exposure limits for the components of this blend see the section 
toxicity and exposure data above for ICOR AT-22. EPA recommends that 
users follow all requirements and recommendations specified in the 
Material Safety Data Sheet (MSDS) for the blend and the individual 
components and other safety precautions common in the refrigeration and 
air conditioning industry. EPA also recommends that users of ICOR XLT1 
adhere to the AIHA's WEELs and the ACGIH's TLV.
    Comparison to other refrigerants: ICOR-XLT1 is not an ozone 
depleter; thus, it poses a lower risk for ozone depletion than the ODSs 
it replaces. ICOR XLT1 has a GWP of about 3000, comparable to other 
substitutes for the ODSs listed above. For example, the GWP of R-407C 
is about 1700, the GWP of R-410A is about 2000, and the GWP of R-404A 
and R-507 are about 3900. Flammability and toxicity risks are low, as 
discussed above. Thus, we find that ICOR XLT1 is acceptable because 
there are no other substitutes that are currently or potentially 
available and that provide a substantially reduced risk to public 
health and the environment in the end uses listed.
3. ICOR XAC1 (R-422B)
    EPA's decision: ICOR XAC1 [R-125/134a/600a (55/42/3)] is acceptable 
for use in new and retrofit equipment as a substitute for HCFC-22 in:

 Chillers (centrifugal, screw, reciprocating)
 Industrial process refrigeration
 Industrial process air conditioning
 Retail food refrigeration
 Cold storage warehouses
 Refrigerated transport
 Commercial ice machines
 Ice skating rinks
 Household refrigerators and freezers
 Vending machines
 Water coolers
 Residential dehumidifiers
 Non-mechanical heat transfer
 Household and light commercial air conditioning and heat pumps
 Very low temperature refrigeration
 Motor vehicle air conditioning (buses and passenger trains 
only)

    ICOR XAC1 is a blend of 55% by weight HFC-125 (pentafluoroethane, 
CAS ID  354-33-6), 42% by weight HFC-134a (1,1,1,2-
tetrafluoroethane, CAS ID 811-97-2), and 3% by weight 
isobutane (2-methyl propane, CAS ID 75-28-5). ASHRAE Standard 
34 has designated this blend as R-422B. You may find the submission 
under EPA Air Docket A-91-42, item VI-D-312.
    Environmental information: The ODP of ICOR XAC1 is zero. For 
environmental information on the components of this blend see the 
section on environmental information above for ICOR AT-22.
    HFC-125 and HFC-134a are excluded from the definition of volatile 
organic compound (VOC) under Clean Air Act (see 40 CFR 51.100(s)) 
regulations addressing the development of State implementation plans 
(SIPs) to attain and maintain the national ambient air quality 
standards.
    EPA is concerned with the relatively high GWP of this substitute. 
The contribution of this blend to greenhouse

[[Page 15591]]

gas emissions will be minimized through the implementation of the 
venting prohibition under section 608 (c)(2) of the Clean Air Act (see 
40 CFR, part 82, subpart F). This section and EPA's implementing 
regulations prohibit venting or release of substitutes for class I or 
class II ODSs used in refrigeration and air conditioning and require 
proper handling, such as recycling or recovery, and disposal of these 
substances.
    Flammability information: While one component of the blend, 
isobutane, is flammable, the blend as formulated and under worst case 
fractionated formulation scenarios is not flammable.
    Toxicity and exposure data: For information on the workplace 
exposure limits for the components of this blend see the section 
toxicity and exposure data above for ICOR AT-22. EPA recommends that 
users follow all recommendations specified in the Material Safety Data 
Sheet (MSDS) for the blend and the individual components and other 
safety precautions common in the refrigeration and air conditioning 
industry. EPA also recommends that users of ICOR XAC1 adhere to the 
AIHA's WEELs and the ACGIH's TLV.
    Comparison to other refrigerants: ICOR XAC1 is not an ozone 
depleter; thus, it poses a lower risk for ozone depletion than HCFC-22, 
the ODS it replaces. ICOR XAC1 has a GWP of about 2500, slightly higher 
than other substitutes for HCFC-22. For example, the GWP of R-407C is 
about 1700 and the GWP of R-410A is about 2000. Flammability and 
toxicity risks are low, as discussed above. Thus, we find that ICOR 
XAC1 is acceptable because it does not pose a greater overall risk to 
public health and the environment in the end uses listed.
4. R-417A
    EPA's decision: R-417A [R-125/134a/600 (46.6/50.0/3.4)] is 
acceptable for use in new and retrofit equipment as a substitute for R-
22 in:

 Motor vehicle air conditioning (busses and passenger trains 
only)

    R-417A is a blend of 46.6 percent HFC-125 (pentafluoroethane, CAS 
ID 354-33-6), 50.0 percent HFC-134a (1,1,1,2-
tetrafluoroethane, CAS ID 811-97-2), and 3.4 percent n-butane 
(CAS ID 106-97-8). You can find the most recent submission in 
EPA Air Docket A-91-42, item VI-D-286.
    In SNAP Notice of Acceptability 16 (March 22, 2002; 67 FR 
13272), EPA noted that the composition of NU-22 was changed to match 
that of ISCEON 59, also known as R-417A, and that EPA previously found 
ISCEON 59 acceptable as a substitute for R-22 in a number of end uses 
in SNAP Notice of Acceptability 11 (December 6, 1999; 64 FR 
68039). R-417A is sold under the trade names NU-22 and ISCEON 59. In 
SNAP Notice of Acceptability 17 (December 20, 2002; 67 FR 
77927), EPA found R-417A acceptable as a substitute for R-502 in 
several end uses. Today's decision adds this refrigerant to the 
acceptable list for HCFC-22 in bus and passenger train motor vehicle 
air conditioners.
    Environmental information: For environmental information on HFC-125 
and HFC-134a, see above in section I.A.1. for ICOR AT-22. The ozone 
depletion potential (ODP) of R-417A is zero. The GWP of butane is less 
than 10 (relative to carbon dioxide, using a 100-year time horizon). 
Butane is a VOC under Clean Air Act regulations (see 40 CFR 51.100(s)) 
concerning the development of SIPs.
    Flammability information: While butane, one component of the blend, 
is flammable, the blend is not flammable.
    Toxicity and exposure data: HFC-125 and HFC-134a have guidance 
level WEELs of 1000 ppm established by the AIHA. Butane has a threshold 
limit value (TLV) of 800 ppm established by the American Conference of 
Government Industrial Hygienists (ACGIH). EPA recommends that users 
follow all recommendations specified in the Material Safety Data Sheet 
(MSDS) for the blend and the individual components and other safety 
precautions common in the refrigeration and air conditioning industry. 
EPA also recommends that users of R-417A will adhere to the AIHA's 
WEELs and the ACGIH's TLVs.
    Comparison to other refrigerants: R-417A is not an ozone depleter; 
thus, it reduces risk from ozone depletion compared to R-22, the ODS it 
replaces. R-417A has a comparable or lower GWP than the other 
substitutes for R-22. Flammability and toxicity risks are low, as 
discussed above. Thus, we find that R-417A is acceptable because it 
does not pose a greater overall risk to public health and the 
environment in the end uses listed.
5. HFC-245fa (Genetron[supreg] 245fa)
    EPA's decision: HFC-245fa[Genetron[supreg] 245fa] is acceptable for 
use in new and retrofit equipment as a substitute for CFC-11, CFC-113, 
CFC-114, HCFC-21, HCFC-123, and HCFC-141b in:

 Low pressure centrifugal chillers
 Non-mechanical heat transfer
 Very low temperature refrigeration
 Industrial process air conditioning
 And industrial process refrigeration

    Refer to the table in Appendix A for specific information as to 
which ODS HFC-245fa substitutes for in each end use. HFC-245fa is sold 
under the trade name of Genetron[supreg] 245fa. HFC-245fa is also known 
as 1,1,1,3,3-pentafluoropropane, Chemical Abstracts Service Registry 
Number (CAS ID ) 460-73-1. You may find the submission under 
EPA Air Docket A-91-42, item VI-D-316.
    Environmental information: ODP of HFC-245fa is zero. The GWP of 
HFC-245fa is 950. The atmospheric lifetime of HFC-245fa is 7.2 years.
    HFC-245fa is excluded from the definition of a VOC under Clean Air 
Act regulations (see 40 CFR 51.100(s)) addressing the development of 
SIPs to attain and maintain the national ambient air quality standards.
    Flammability information: HFC-245fa is nonflammable.
    Toxicity and exposure data: EPA recommends that users follow all 
requirements and recommendations specified in the Material Safety Data 
Sheet (MSDS) for the blend and the individual components and other 
safety precautions common in the refrigeration and air conditioning 
industry. EPA also recommends that users of HFC-245fa adhere to the 
AIHA's WEEL of 300 ppm (time weighted average for 8 hour/day, 40 hour/
week).
    Comparison to other refrigerants: HFC-245fa is not an ozone 
depleter; thus, it poses a lower risk for ozone depletion than the ODSs 
it replaces. HFC-245fa has a lower GWP than the CFC refrigerants it 
replaces. HFC-245fa is non-flammable. HFC-245fa exhibits moderate to 
low toxicity and guidance is available from the AIHA and the ACGIH on 
its use in the workplace. Thus, we find that HFC-245fa is acceptable 
because it does not pose a greater overall risk to public health and 
the environment in the end uses listed.
6. R-420A
    EPA's decision: R-420A is acceptable for use, subject to use 
conditions, in retrofit equipment as a substitute for CFC-12 in motor 
vehicle air conditioning.
    R-420A is a blend of 88% by weight HFC-134a (1,1,1,2-
tetrafluoroethane, CAS ID 811-97-2), and 12% by weight HCFC-
142b (1-chloro-1,1-difluoroethane, CAS ID 75-68-3). Note that 
HCFC-142b is an ozone-depleting substance (ODS). Regulations regarding 
recycling and prohibiting venting issued under section 609 of the Clean 
Air Act apply to this blend. A common trade name for this refrigerant 
blend is Choice refrigerant. You may find the submission under EPA Air 
Docket A-

[[Page 15592]]

91-42, item VI-D-302 (or see e-docket EPA-HQ-OAR-2003-0118). R-420A was 
previously approved as a substitute refrigerant in other refrigeration 
and air conditioning end-uses in SNAP Notice 19 (69 FR 58905, October 
4, 2004).
    Conditions for use in motor vehicle air conditioning systems: On 
October 16, 1996 (61 FR 54029), EPA promulgated a final rule that 
prospectively applied certain conditions on the use of any refrigerant 
used as a substitute for CFC-12 in motor vehicle air conditioning 
systems (Appendix D of subpart G of 40 CFR part 82). That rule provided 
that EPA would list new refrigerants in future notices of 
acceptability. Therefore, the use of R-420A as a CFC-12 substitute in 
motor vehicle air conditioning systems must follow the standard 
conditions imposed on previous refrigerants, including:

 The use of unique fittings designed by the refrigerant 
manufacturer,
 The application of a detailed label,
 The removal of the original refrigerant prior to charging with 
R-420A, and
 The installation of a high-pressure compressor cutoff switch 
on systems equipped with pressure relief devices.

    The October 16, 1996 rule gives full details on these use 
conditions.
    You must use the following fittings to use R-420A in motor vehicle 
air conditioning systems:

----------------------------------------------------------------------------------------------------------------
                                                  Diameter      Thread pitch
                 Fitting type                     (inches)     (threads/inch)          Thread  direction
----------------------------------------------------------------------------------------------------------------
Low-side service port........................    .5625 (9/16)              18  Left.
High-side service port.......................    .5625 (9/16)              18  Right.
Large containers (>20 lb.)...................    .5625 (9/16)              18  Left.
Small Cans...................................    .5625 (9/16)              18  Right.
----------------------------------------------------------------------------------------------------------------

    The labels will have a dark green background (PMS 347) and 
white text.
    Environmental information: The ODP of HCFC-142b is 0.065 and HFC-
134a has an ODP of zero. The GWPs of HCFC-142b and HFC-134a are 2400 
and 1320, respectively. The atmospheric lifetimes of these constituents 
are 17.9 and 14.0 years, respectively.
    Because R-420A contains an ODS, regulations on its use apply, 
including the requirements for technician certification, mandatory 
recovery of refrigerant during service of equipment containing R-420A, 
a requirement that sales of the refrigerants be made only to EPA-
certified technicians, and the statutory prohibition under section 
608(c) of the Clean Air Act against knowingly venting refrigerants. 
Production and/or import of HCFC-142b is currently restricted to 
persons holding production and/or consumption allowances under 40 CFR 
part 82 subpart A. Hence, manufacturers and importers of R-420A may 
have difficulty obtaining adequate supply of the HCFC-142b component 
necessary to formulate the blend. HCFC-142b will be subject to further 
control beginning in 2010 when the next major milestone in the HCFC 
phaseout occurs and supplies may be further limited. As of January 1, 
2010, production and import of HCFC-22 or HCFC-142b will be limited to 
the purposes of use in equipment manufactured before January 1, 2010, 
transformation or destruction of the HCFC, or for export in accordance 
with 40 CFR Part 82 Subpart A. Thus, blends containing HCFC-142b such 
as R-420A are only transitional substitutes. EPA has proposed a rule 
prohibiting the use of HCFC-142b and HCFC-22 as ODS substitutes for 
foam blowing (70 FR 67120), and is considering similar action 
restricting HCFC-142b and HCFC-22 in other industrial sectors.
    HCFC-142b and HFC-134a are excluded from the definition of VOC 
under Clean Air Act regulations (see 40 CFR 51.100(s)) addressing the 
development of SIPs to attain and maintain the national ambient air 
quality standards.
    Flammability information: Although the component HCFC-142b is 
moderately flammable, the blend is not flammable as formulated or under 
worst-case fractionated formulation scenarios.
    Toxicity and exposure data: HCFC-142b and HFC-134a have 8 hour/day, 
40 hour/week WEELs of 1000 ppm established by the AIHA. EPA recommends 
that users follow all recommendations specified in the MSDS for the 
blend and the individual components and other safety precautions common 
in the refrigeration and air conditioning industry. EPA also recommends 
that users of R-420A adhere to the AIHA's WEELs.
    Comparison to other refrigerants: R-420A has a lower ODP than that 
of the Class I ODS it replaces, CFC-12, and lower than that of other 
blends containing Class II ODS in this end use. R-420A has a comparable 
GWP to that of most other substitutes for CFC-12. Flammability and 
toxicity risks are low, as discussed above. Thus, we find that R-420A 
is acceptable as a substitute for CFC-12 in the end use listed.
    Although this substitute has an ozone depleting potential, the 
contribution of this blend to ozone depletion will be minimized through 
the implementation of the venting prohibition under section 608 (c) of 
the Clean Air Act (see 40 CFR, part 82, subpart F). This section and 
EPA's implementing regulations prohibit venting or release of 
substitutes for class I or class II ozone ODS used in refrigeration and 
air conditioning and require proper handling, such as recycling or 
recovery, and disposal of these substances.

B. Foam Blowing

1. TranscendTM Technologies
    EPA's decision: Transcend(TM) Technologies is 
acceptable, as an additive to other SNAP-approved foam blowing agents, 
in blends making up to 5% by weight of the total foam formulation, as a 
substitute for CFCs and HCFCs in the following end-uses:

 Rigid polyurethane and polyisocyanurate laminated boardstock;
 Rigid polyurethane appliance;
 Rigid polyurethane, spray, commercial refrigeration, and 
sandwich
 Rigid polyurethane slabstock and other foams;
 Polyurethane integral skin foam;
 Polyurethane: extruded sheet

    For the spray foam application within the rigid polyurethane, 
spray, commercial refrigeration, and sandwich end use, 
TranscendTM Technologies may only be used with other blowing 
agents that are SNAP-approved specifically for spray foam. It is not 
acceptable to use TranscendTM Technologies for saturated 
light hydrocarbons or for other blowing agents that are not SNAP-
approved specifically for use in spray foam. The blowing agent blended 
with TranscendTM Technologies must be SNAP-approved for that 
specific end use.
    The submitter, Arkema Inc, claims that the composition of 
TranscendTM Technologies is confidential business 
information (see docket A-91-42, item VI-D-311).

[[Page 15593]]

    Environmental information: TranscendTM Technologies has 
no ODP and very low or zero GWP. Users should be aware that 
TranscendTM Technologies is considered a VOC under Clean Air 
Act regulations (see 40 CFR 51.100(s)) addressing the development of 
State implementation plans (SIPs) to attain and maintain the national 
ambient air quality standards. For more information refer to the 
manufacturer of TranscendTM Technologies, EPA regulations at 
40 CFR part 51, and your state or local air quality agency.
    Flammability information: TranscendTM Technologies is 
flammable and should be handled with proper precautions. Use of 
TranscendTM Technologies will require safe handling and 
shipping as prescribed by OSHA and DOT (for example, using personal 
safety equipment and following requirements for shipping hazardous 
materials at 49 CFR parts 170 through 173). However, when blended with 
fire retardant and/or other SNAP-approved alternatives, the 
flammability of TranscendTM Technologies can be reduced to 
make a formulation that is either combustible or non-flammable (contact 
the manufacturer of TranscendTM Technologies for more 
information). For example, in blowing-agent blends of 50% 
TranscendTM Technologies and 50% HFC-134a, or in blends of 
less than 97% TranscendTM Technologies and 3% or more HFC-
245fa, the resultant formulation is nonflammable.
    For information on the safety training requirements for use of 
flammable blowing agents in spray foam, refer to SNAP Notice of 
Acceptability 11 (64 FR 68039, December 6, 1999) or contact the EPA 
SNAP program.
    Toxicity and exposure data: TranscendTM Technologies 
should be handled with proper precautions. EPA recommends that users 
follow all recommendations specified in the MSDS for 
TranscendTM Technologies. OSHA has established a permissible 
exposure limit for the main component of TranscendTM 
Technologies of 200 ppm for a time-weighted average over an eight-hour 
work shift.
    Comparison to other foam blowing agents: TranscendTM 
Technologies is not an ozone depleter; thus, it reduces risk overall 
compared to the ODSs it replaces. TranscendTM Technologies 
has a comparable or lower GWP than the other substitutes for CFCs and 
HCFCs in these end uses. Thus, we find that TranscendTM 
Technologies is acceptable because it reduces overall risk to public 
health and the environment in the end uses listed.

C. Fire Suppression and Explosion Protection

1. Uni-light Advanced Fire Fighting Foam 1% (Uni-light AFFF 1%)
    EPA's decision: Uni-light AFFF 1% is acceptable for use as a 
substitute for halon 1301 in the total flooding end use in both 
normally occupied and unoccupied spaces.
    Uni-light AFFF 1% is a water mist system with 1 percent (by mass) 
foam enhancement mixed with water. It is intended for use in machinery 
spaces onboard ships and off-shore installations. You may find the 
submission under Docket A-91-42, item VI-D-315 (or see e-docket EPA-HQ-
OAR-2003-0118-116).
    EPA previously found water mist systems with potable water or 
natural sea water acceptable in total flooding (July 28, 1995; 60 FR 
38729). In the same listing, EPA required that water mist systems 
containing additives different than those in potable water, and water 
mist systems comprised of mixtures in solution must be submitted to EPA 
for SNAP review on a case-by-case basis. With regard to a water mist 
and foam system, any changes to the foam mixture may constitute a new 
formulation and is, therefore, subject to SNAP review.
    Environmental information: All of the components of Uni-light AFFF 
1% have an ozone depletion potential of zero. Its components have a 
negligible atmospheric lifetime and global warming potential.
    One component of Uni-light's foam mixture, 2-(2-Butoxyethoxy) 
ethanol (also called diethylene glycol monobutyl ether, or DGBE, CAS 
ID 112-34-5), is defined as a hazardous air pollutant (HAP) 
under the Clean Air Act.
    The component DGBE is also regulated as a controlled substance by 
the Toxic Substance Control Act (TSCA). Therefore, all materials used 
to clean spaces after an accidental should be handled and disposed of 
as hazardous waste in accordance with federal, state, or local 
requirements.
    Flammability: The blend is non-flammable.
    Toxicity and exposure data: The most toxic component of the foam 
blend, DGBE, has an occupational exposure limit, 8-hour time-weighted 
average, of 100 mg/m\3\ as a Maximum Concentration Value in the 
Workplace set by the Federal Republic of Germany. All but two 
components of the foam blend are classified as ``generally recognized 
as safe'' by the U.S. Food and Drug Administration.
    As with other fire suppressants, EPA recommends that users minimize 
exposure to this agent. In order to keep exposure levels as low as 
possible, EPA recommends the following for establishments installing 
and maintaining total flooding systems:

     Make self-contained breathing apparatus (SCBA) available 
in normally occupied areas;
     Wear proper personal protection equipment (impervious 
butyl gloves, eye protection, and SCBA);
     Clean up all spills immediately in accordance with good 
industrial hygiene practices; and
     Provide training for safe handling procedures to all 
employees that would be likely to handle the containers of foam 
additive.
    Use of this agent should conform to relevant Occupational Safety 
and Health Administration (OSHA) requirements, including 29 CFR part 
1910, subpart L, Sec. 1910.160 for fixed fire extinguishing systems, 
Sec. 1910.163 for water spray and foam systems and Sec. 1910.165 for 
predischarge employee alarms. Per OSHA requirements, protective gear 
(SCBA) should be available in the event of a discharge.
    Comparison to other fire suppressants: Uni-light AFFF 1% has no 
ODP; thus, its use will be less harmful to the atmosphere than the 
continued use of halon 1301. The components of Uni-light AFFF 1% have a 
GWP comparable with or lower than that of many other acceptable 
substitutes for halon 1301. Thus, we find that Uni-light AFFF 1% 
acceptable because it does not pose a greater overall risk to human 
health and the environment than other acceptable substitutes in the end 
uses and applications listed above.

II. Section 612 Program

A. Statutory Requirements

    Section 612 of the Clean Air Act authorizes EPA to develop a 
program for evaluating alternatives to ozone-depleting substances. We 
refer to this program as the Significant New Alternatives Policy (SNAP) 
program. The major provisions of section 612 are:
     Rulemaking--Section 612(c) requires EPA to promulgate 
rules making it unlawful to replace any class I (chlorofluorocarbon, 
halon, carbon tetrachloride, methyl chloroform, and 
hydrobromofluorocarbon) or class II (hydrochlorofluorocarbon) substance 
with any substitute that the Administrator determines may present 
adverse effects to human health or the environment where the 
Administrator has identified an alternative that (1)

[[Page 15594]]

reduces the overall risk to human health and the environment, and (2) 
is currently or potentially available.
     Listing of Unacceptable/Acceptable Substitutes--Section 
612(c) also requires EPA to publish a list of the substitutes 
unacceptable for specific uses. EPA must publish a corresponding list 
of acceptable alternatives for specific uses.
     Petition Process--Section 612(d) grants the right to any 
person to petition EPA to add a substance to or delete a substance from 
the lists published in accordance with section 612(c). The Agency has 
90 days to grant or deny a petition. Where the Agency grants the 
petition, it must publish the revised lists within an additional six 
months.
     90-day Notification--Section 612(e) directs EPA to require 
any person who produces a chemical substitute for a class I substance 
to notify the Agency not less than 90 days before new or existing 
chemicals are introduced into interstate commerce for significant new 
uses as substitutes for a class I substance. The producer must also 
provide the Agency with the producer's unpublished health and safety 
studies on such substitutes.
     Outreach--Section 612(b)(1) states that the Administrator 
shall seek to maximize the use of federal research facilities and 
resources to assist users of class I and II substances in identifying 
and developing alternatives to the use of such substances in key 
commercial applications.
     Clearinghouse--Section 612(b)(4) requires the Agency to 
set up a public clearinghouse of alternative chemicals, product 
substitutes, and alternative manufacturing processes that are available 
for products and manufacturing processes which use class I and II 
substances.

B. Regulatory History

    On March 18, 1994, EPA published the final rulemaking (59 FR 13044) 
which described the process for administering the SNAP program. In the 
same notice, we issued the first acceptability lists for substitutes in 
the major industrial use sectors. These sectors include:
     Refrigeration and air conditioning;
     Foam blowing;
     Solvents cleaning;
     Fire suppression and explosion protection;
     Sterilants;
     Aerosols;
     Adhesives, coatings and inks; and
     Tobacco expansion.

These sectors compose the principal industrial sectors that 
historically consumed the largest volumes of ozone-depleting compounds.
    As described in this original rule for the SNAP program, EPA does 
not believe that rulemaking procedures are required to list 
alternatives as acceptable with no limitations. Such listings do not 
impose any sanction, nor do they remove any prior license to use a 
substance. Therefore, by this notice we are adding substances to the 
list of acceptable alternatives without first requesting comment on new 
listings.
    However, we do believe that notice-and-comment rulemaking is 
required to place any substance on the list of prohibited substitutes, 
to list a substance as acceptable only under certain conditions, to 
list substances as acceptable only for certain uses, or to remove a 
substance from the lists of prohibited or acceptable substitutes. We 
publish updates to these lists as separate notices of rulemaking in the 
Federal Register.
    The Agency defines a ``substitute'' as any chemical, product 
substitute, or alternative manufacturing process, whether existing or 
new, intended for use as a replacement for a class I or class II 
substance. Anyone who produces a substitute must provide EPA with 
health and safety studies on the substitute at least 90 days before 
introducing it into interstate commerce for significant new use as an 
alternative. This requirement applies to substitute manufacturers, but 
may include importers, formulators, or end-users, when they are 
responsible for introducing a substitute into commerce.
    You can find a complete chronology of SNAP decisions and the 
appropriate Federal Register citations from the SNAP section of EPA's 
Ozone Depletion World Wide Web site at http://www.epa.gov/ozone/snap/chron.html.
 This information is also available from the Air Docket (see 

ADDRESSES section above for contact information).

List of Subjects in 40 CFR Part 82

    Environmental protection, Administrative practice and procedure, 
Air pollution control, Reporting and recordkeeping requirements.

    Dated: March 17, 2006.
Brian J. McLean,
Director, Office of Atmospheric Programs.

Appendix A: Summary of Acceptable Decisions

----------------------------------------------------------------------------------------------------------------
               End-use                        Substitute                Decision           Further information
----------------------------------------------------------------------------------------------------------------
                                       Refrigeration and Air Conditioning
----------------------------------------------------------------------------------------------------------------
Motor vehicle air conditioning         R-420A as a substitute   Acceptable Subject to    Must be used with
 (retrofit).                            for CFC-12.              Use Conditions.          fittings and labels
                                                                                          specified above.
Motor vehicle air conditioning (new    ICOR XAC1 (R-422B) as a  Acceptable.............
 and retrofit) (busses and passenger    substitute for HCFC-22.
 trains only).
                                       R-417A as a substitute   Acceptable.............
                                        for HCFC-22.
Industrial process refrigeration       ICOR AT-22 as a          Acceptable.............
 (retrofit and new).                    substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
                                       HFC-245fa as a           Acceptable.............
                                        substitute for CFC-114.
Industrial process air conditioning    ICOR AT-22 as a          Acceptable.............
 (retrofit and new).                    substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.

[[Page 15595]]


                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
                                       HFC-245fa as a           Acceptable.............
                                        substitute for CFC-114.
Ice skating rinks (retrofit and new).  ICOR AT-22 as a          Acceptable.............
                                        substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Cold storage warehouses (retrofit and  ICOR AT-22 as a          Acceptable.............
 new).                                  substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Refrigerated transport (retrofit and   ICOR AT-22 as a          Acceptable.............
 new).                                  substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Retail food refrigeration (retrofit    ICOR AT-22 as a          Acceptable.............
 and new).                              substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Vending machines (retrofit and new)..  ICOR AT-22 as a          Acceptable.............
                                        substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Water coolers (retrofit and new).....  ICOR AT-22 as a          Acceptable.............
                                        substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Commercial ice machines (retrofit and  ICOR AT-22 as a          Acceptable.............
 new).                                  substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Household refrigerators and freezers   ICOR AT-22 as a          Acceptable.............
 (retrofit and new).                    substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Centrifugal chillers (retrofit and     ICOR AT-22 as a          Acceptable.............
 new).                                  substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
                                       HFC-245fa as a           Acceptable.............
                                        substitute for CFC-114
                                        and HCFC-123.
Centrifugal chillers (new)...........  HFC-245fa as a           Acceptable.............
                                        substitute for CFC-11.
Reciprocating chillers (retrofit and   ICOR AT-22 as a          Acceptable.............
 new).                                  substitute for HCFC-22.

[[Page 15596]]


                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Screw chillers (retrofit and new)....  ICOR AT-22 as a          Acceptable.............
                                        substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Residential dehumidifiers (retrofit    ICOR AT-22 as a          Acceptable.............
 and new).                              substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Non-mechanical heat transfer           ICOR AT-22 as a          Acceptable.............
 (retrofit and new).                    substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
                                       HFC-245fa as a           Acceptable.............
                                        substitute for CFC-11,
                                        CFC-113, HCFC-21, and
                                        HCFC-141b.
Very low temperature refrigeration     ICOR AT-22 as a          Acceptable.............
 (retrofit and new).                    substitute for HCFC-22.
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
Very low temperature refrigeration     HFC-245fa as a           Acceptable.............
 (new).                                 substitute for CFC-11,
                                        CFC-114, and HCFC-141b.
Household and light commercial air     ICOR AT-22 as a          Acceptable.............
 conditioning and heat pumps            substitute for HCFC-22.
 (retrofit and new).
                                       ICOR XLT1 (R-422C) as a  Acceptable.............
                                        substitute for HCFC-
                                        22, R-502, R-402A, R-
                                        402B, and R-408A.
                                       ICOR XAC1 (R-422B) as a  Acceptable.............
                                        substitute for HCFC-22.
----------------------------------------------------------------------------------------------------------------
                                                  Foam Blowing
----------------------------------------------------------------------------------------------------------------
Rigid polyurethane and                 TranscendTM              Acceptable.............  Decision only applies
 polyisocyanurate laminated             Technologies as an                                where the foam blowing
 boardstock.                            additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.
Rigid polyurethane appliance.........  TranscendTM              Acceptable.............  Decision only applies
                                        Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.
Rigid polyurethane, spray............  TranscendTM              Acceptable.............  Decision only applies
                                        Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for                            Follow manufacturers'
                                        CFCs and HCFCs.                                   safety guidance for
                                                                                          any flammable
                                                                                          components in the
                                                                                          blend.
Rigid polyurethane, commercial         TranscendTM              Acceptable.............  Decision only applies
 refrigeration and sandwich.            Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.

[[Page 15597]]


Rigid polyurethane slabstock and       TranscendTM              Acceptable.............  Decision only applies
 other foams.                           Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.
Polyurethane integral skin foam......  TranscendTM              Acceptable.............  Decision only applies
                                        Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.
Polyurethane: extruded sheet.........  Transcend\TM\            Acceptable.............  Decision only applies
                                        Technologies as an                                where the foam blowing
                                        additive to other SNAP-                           blend makes up to 5%
                                        approved foam blowing                             by weight of the total
                                        agents for this end                               foam formulation.
                                        use as substitutes for
                                        CFCs and HCFCs.
----------------------------------------------------------------------------------------------------------------
                                    Fire Suppression and Explosion Protection
----------------------------------------------------------------------------------------------------------------
Total flooding.......................  Uni-light AFFF 1% as a   Acceptable.............  This agent is intended
                                        substitute for Halon                              for use onboard ships
                                        1301.                                             and in off-shore
                                                                                          installations.
                                                                                         Appropriate personal
                                                                                          protective equipment
                                                                                          should be worn during
                                                                                          manufacture or in the
                                                                                          event of a release.
                                                                                          Personal protective
                                                                                          equipment should
                                                                                          include safety
                                                                                          goggles, protective
                                                                                          gloves, and a self-
                                                                                          contained breathing
                                                                                          apparatus.
                                                                                         Supply bottles for the
                                                                                          foam should be clearly
                                                                                          labeled with the
                                                                                          potential hazards
                                                                                          associated with the
                                                                                          use of the chemicals
                                                                                          in the foam, as well
                                                                                          as handling procedures
                                                                                          to reduce risk
                                                                                          resulting from these
                                                                                          hazards.
                                                                                         Use should conform with
                                                                                          relevant OSHA
                                                                                          requirements,
                                                                                          including 29 CFR part
                                                                                          1910, subpart L, Sec.
                                                                                          Sec.   1910.160 and
                                                                                          1910.163.
                                                                                         EPA has no intention of
                                                                                          duplicating or
                                                                                          displacing OSHA
                                                                                          coverage related to
                                                                                          the use of personal
                                                                                          protection equipment
                                                                                          (e.g., respiratory
                                                                                          protection), fire
                                                                                          protection, hazard
                                                                                          communication, worker
                                                                                          training or any other
                                                                                          occupational safety
                                                                                          and health standard
                                                                                          with respect to halon
                                                                                          substitutes.
----------------------------------------------------------------------------------------------------------------

[FR Doc. 06-3030 Filed 3-28-06; 8:45 am]

BILLING CODE 6560-50-P
