Page
1
of
3
January
11,
2005
MEMORANDUM
Subject:
Product
Chemistry
Science
Chapter
for
Didecyl
Dimethyl
Ammonium
Chloride
(
DDAC)

To:
A
.
Najm
Shamim,
Risk
Assessor
for
DDAC
Regulatory
Management
Branch
II
Antimicrobials
Division
(
7510C)

And
Tracy
Lantz,
CRM
for
DDAC
RED
Regulatory
Management
Branch
I
Antimicrobials
Division
(
7510C)

From:
Chris
Jiang,
Chemist
Product
Science
Branch
Antimicrobials
Division
(
7510C)

Thru:
Karen
P.
Hicks,
CTT
Team
Leader
Product
Science
Branch
Antimicrobials
Division
(
7510C)

Michele
Wingfield,
Branch
Chief
Product
Science
Branch
Antimicrobials
Division
(
7510C)

DP
Barcode:
D323311
Chemical
Code:
069149
EPA
Reg.
No.:
3377­
42
MRID
#=
s:
44520301
44520302
44520303
Enclosed
is
the
Science
Chapter
for
Didecyl
Dimethyl
Ammonium
Chloride
Reregistration
Eligibility
Decision
(
RED).
Page
2
of
3
Science
Chapter
on
for
Didecyl
Dimethyl
Ammonium
Chloride
(
MRID
#=
s:
44520301,
44520302,
44520303)
Product
Chemistry
Case
Overview
Chemical
Overview
The
main
ingredient
covered
for
this
Science
Chapter
is:
Didecyl
Dimethyl
Ammonium
Chloride
Chemical
Name:
Didecyl
dimethyl
ammonium
chloride
Common/
Trade
Names:
Di­
n­
decyl
dimethyl
ammonium
chloride,
DDAC
Chemical
Family:
Quaternary
amines
CAS
Registry
Number:
7173­
51­
5
OPP
Chemical
Code:
069149
Molecular
Formula:
R2C2H6NCl
(
R
=
n­
decyl)

Molecular
Weight:
362.08
SCIENCE
ASSESSMENT
The
Agency
thoroughly
reviewed
the
registrants
=

submissions
(
in­
house
literature)
for
the
purpose
of
determining
the
reregistration
eligibility
of
didecyl
dimethyl
ammonium
chloride
for
use
in
wood
preservatives,
in
agricultural
premises
and
equipment,
in
industrial
processes
and
water
systems,
and
in
commercial,
institutional,
and
residential
premises.

Product
Chemistry
Assessment
The
physical
and
chemical
characteristics
of
didecyl
dimethyl
ammonium
chloride
are
described
below.

Technical
Grade
Active
Ingredient
(
TGAI):

Chemical
Name:
Didecyl
dimethyl
ammonium
chloride
Molecular
Wt.
362.08
Color:
100
APHA
units
Physical
State:
Liquid
Odor:
Ethanolic
*
Melting
Point:
228.81
oC
Boiling
Point:
Please
provide
boiling
point
data
Could
not
be
established
because
test
article
is
a
multi­
component
system
with
each
component
boiling
at
a
different
temperature?
Density:
0.9216
g/
cm3
at
25
oC
Water
Solubility:
Completely
soluble
*
Vapor
Pressure:
2.33
x
10­
11
mm
Hg
Dissociation
Constant:
Not
applicable
*
log
Kow:
4.6581
Page
3
of
3
pH:
6.31
Stability:
Stable
with
respect
to
metal,
nonmetal,
temperature,
and
light
Oxidizing/
Reducing
Potential:
Not
applicable
as
product
does
not
contain
oxidizers
or
reducers
Flash
Point:
38.0
o
C
Explodability:
Not
applicable
for
liquids
which
are
not
potentially
explosive
Viscosity:
28.35
cSt
at
25
oC
Miscibility:
Not
applicable
as
product
is
not
to
be
mixed
with
petroleum
solvents
Corrosion
Characteristics
Corrosive
to
stainless
steel
and
no
corrosion
to
HDPE
Dielectric
breakdown
voltage:
Not
applicable
as
product
is
not
to
be
used
near
electrical
equipment
*­
Values
obtained
from
EpiSuite
Didecyl
Dimethyl
ammonium
chloride
PRODUCT
CHEMISTRY
BIBLIOGRAPHY
US
EPA
=

s
MRID
#:
44520301,
Albemarle
DAQ­
1010­
5
Biocide 
Product
Chemistry,
(
1998)
Albemarle
Corp.,
Lab
Project
Number
8382­
139
Quat
10,
Albemarle
Corporation.

US
EPA
=

s
MRID
#:
44520302,
Tolbert,
A.,
Product
Chemistry
Chemical
Characterization
for
Determining
Identity
and
Purity
of
50%
Di­
N­
Decyl
Dimethyl
Ammonium
Chloride,
(
1998),
Lab
Project
Number
Quat
10B,
Albemarle
Corporation.

US
EPA
=

s
MRID
#:
44520303,
Tolbert,
A.,
Product
Chemistry
Chemical
Characterization
for
Determining
the
Physical
and
Chemical
Properties,
and
Accelerated
Storage
Stability
of
50%
Di­
N­
Decyl
Dimethyl
Ammonium
Chloride,
(
1998),
Lab
Project
Number
Quat
10A,
Albemarle
Corporation.

EPISuite
Property
Assessment
Program
Appendix
I:
Impurities
evolved
during
the
manufacture
of
Didecyl
dimethyl
ammonium
chloride
Chemical
name
Methyl
chloride
Di­
n­
decylmethyl
amine
Di­
n­
decylmethyl
amine­
hydrochloride
Methanol
No
percentages
of
these
impurities
are
given.
