Margaret I forwarded your questions to the individual who conducted the

test for us.  Attached is his response to your questions.  Please let us

know if you need anything else.  Steve

(See attached file: Answer to EPA nPB Questions.doc)

                                                                        
                                                                   

                      Sheppard.Margaret@epam                            
                                                                   

                      ail.epa.gov                   To:      
cook@techspray.com                                                      
     

                                                    cc:      
scook@techspray.com                                                     
     

                      11/05/2003 11:31 AM           Subject:  Questions
about TechSpray's exposure testing for nPB                          

                                                                        
                                                                   

                                                                        
                                                                   

Dear Steve,

I have been going over the public comments on the nPB rule, including

TechSpray's testing of aerosol exposures.  I have a few questions about

the testing, and I'd appreciate your help in answering them.

1) How much nPB was emitted for each sample?

I saw the following information in the study:

sample 1, approximately 205 g of nPB were sprayed;

sample 2, 355 g;

sample 4, 178 g;

and for the six samples over the course of a work day, an estimated

daily amount of 310 g.

What was the amount for samples 3 and 5?

2) How did you determine the amount of nPB sprayed?  Was the can weighed

before and after, or was there a different method?

3) What is the composition of a typical aerosol formulation using nPB?

The study mentioned that HFC-134a and CO2 would be present as

propellants.  What weight percent of the formulation would be nPB, and

how much would be other components?  What was the composition that

TechSpray tested?

4) How did you determine the amount of nPB used over 8 hours?

This information will help us better understand the testing that

TechSpray performed.  Thanks for your time and consideration.

Sincerely,

Margaret Sheppard

USEPA/Global Programs Division

SNAP Program

Tel. 202-343-9163

Fax 202-343-2338

email: sheppard.margaret@epa.gov

