Document ID: EPA-HQ-OAR-2002-0064-0202
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2007-03-28T04:00Z

11/12/03,	 Response to EPA Questionnaire on 11/5/03 11:31am.

Margaret Sheppard 	USEPA/SNAP Program

EPA Question 1. 

How much nPB was emitted for each sample? How much was emitted for
samples 3 and 5?

EPA Question 2.

How did you determine the amount of nPB sprayed? Was the can weighed
before and after, or was there a different method?

EPA Question 3.

 What is the composition of a typical aerosol formulation using nPB?
What was the composition that TechSpray tested?

EPA Question 4. 

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

TechSpray answer to EPA Questions 1.

The following table illustrates the amount of nPB emitted during each
sampling event. 

Samples 3 and 5 were taken at the same time as samples 2 and 4
respectively therefore the amount emitted is the same as the reported
amounts for samples 2 and 4.  Samples 6 through 11 were taken during the
8 hour workday period and the average emissions for the three six
samples taken was 310 grams.

Test	Sample (s)	Time	# of cans used	  Total used contents	Total nPB
emitted

No. 1	1	      	15min		1.2		250grams	205g n-PB

No. 1	2 and 3   	15min		2.1		433 grams	355g n-PB 

No. 1	4 and 5  	15min		1.1		217 grams	178g n-PB

No. 2	6 and 7   	480min	1.8		375 grams	308g n-PB

No. 3	8 and 9     	480min	1.85		377 grams	309g n-PB 

No. 2	10 and 11 	480min	2.0		382g grams	313g n-PB

TechSpray answer to EPA Questions 2.

Weighing the can at the beginning and end of each test and calculating
the difference determined the amount of n-PB used in aerosol form. This
weight in grams was then multiplied by 82% to determine actual n-PB
usage. 

TechSpray answer to EPA Questions 3.

Each sample product was comprised of 82% n-PB, 15% 134a, and 3% CO2.
Typical aerosol formulations usually contain one main active ingredient
and may contain variable amounts of additional components i.e. acetone
at 3% and ethanol at 2.5%.

TechSpray answer to EPA Questions 4.

Please see TechSpray answer to EPA Question 2.