U. S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF AIR QUALITY PLANNING & STANDARDS

EMISSION STANDARDS DIVISION

RESEARCH TRIANGLE PARK, NC 27711

COVER SHEET

DATE	August 18, 1998

(Revised 8/20/98)

TO:	Persons Interested in the Surface Coating of Large Appliances Rule Development

FROM:	Dr. Mohamed Serageldin

VOICE PHONE:	919-541-2379	FAX PHONE: 919-541-5689

E-MAIL	serageldin.mohamed@epamail.epa.gov

OFFICE:	U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF AIR QUALITY PLANNING & STANDARDS

EMISSION STANDARDS DIVISION

RESEARCH TRIANGLE PARK, NC 27711

MESSAGE:	Coating Calculation Sheet for Use in Completing the Industry Questionnaire

The attached Coating Calculation Sheet is provided as an aid to the recipients of the industry questionnaire. The Coating Calculation Sheet may be used as a guide for determining the physical property data requested in the questionnaire for coatings used at the facility.

Coating Calculation Sheet for HAPs # ____

Date:____________

Component 1.	Coating	Manufacturer__________________________

Batch No.______________; ID____________

Type_______________
2.	Thinner	Manufacturer__________________________

Batch No.______________; ID____________

Steps	Instructions (see END NOTES before starting)
1	Input density of coating, Dc equals 1.60 kg/L

on line 1a. 1a. 1.6 kg/L

Determine total volatile HAP from Manufacturers information, input on line 1b.

108-88-3 Toluene 22 % (by mass)

100-41-4 Ethyl benzene 6 % (by mass)

133020-7 Xylene 23 % (by mass)

_______

51% (by mass) 1b. 51%

Hence, mass of volatile HAPs equals 0.51 x 1.6 kg/L = 0.816 kg/L

(Always use 3 significant figures)

Determine total nonvolatile HAP from Manufacturer's information, input on line 1c.

Compound A [% lead] 7% (by mass) [4% lead] Compound A [% Cr] 7% (by mass ) [0.8% Cr]

1c. 0.336%
2	Input volume fraction solids, Vs, as supplied

(liters solids/liter coating) on line 2a. 2a. 29.4% by vol.
3	Calculate the volume of volatiles in a coating (%)

by subtracting 2a from 100%, input on line 3a. 3a. 70.6% by vol

4	Determine the total mass of HAPs per liter of coating (as-supplied), MHAP,s

Add 1b and 1c and multiply by 1a,

input on line 4a. 4a. 0.821 kg HAP/L coating

5	Determine the MHAP per liter of coating (as-applied) MHAP,a

Define the thinning ratio, Rth, L thinner/L coating,

input on line 5a. 5a. 20% (by vol).

Input thinner density, Dth (kg /L) on line 5b 5b. 1.00 kg/L thinner

Determine % mass of HAPs in thinner as shown in 5b,

input on line 5c 5c. 100%

6	Determine mass HAPs in a liter of thinner

Thinner added to coating is 0.2L/L coating, therefore,

to determine kg HAP in 0.2L thinner:

multiplying 5a x 5b x 5c, input result on line 6a. 6a. 0.2 kg HAP/L thinner

Determine total volume of HAPs in the thinned

coating (0.706 + 0.200), input on line 6b. 6b. 0.906 L HAP/L coating

Determine total mass of HAPs in the

thinned coating (0.821 + 0.200), input on line 6c. 6c. 1.021 kg HAP

Determine the total volume of thinned coating,

input on line 6d. 6d. 1.2 L coating

7	Calculate the mass of HAP in a liter of thinned

coating (as-applied) by dividing 6c by 6d,

input on line 7a. 7a. 0.851 kg HAP/L coating

(as-applied)
8	Calculate the as-supplied mass of HAPs per volume solids

Divide 4a by 2a (0.821/0.294), input on line 8a. 8a. 2.79 kg HAP/L solids
9	Calculate the as-applied mass of HAPs per volume solids

Determine volume solids (%) for the thinned coating

100 (1L x 0.294 L)/1.2 L, input on line 9a. 9a. 24.5% by vol

Divide 7a by 9a (0.851/0.245), input on line 9b. 9b. 3.47 kg HAP/L solids
END	NOTES--

1. If the HAP percentage is provided as a range, use the mid-point of the range for each HAP.

2. To determine HAPs from multicomponent coatings, define the mix ratio (e.g., 4:1 ratio, 80% A and 20% B). Perform Step 1 for each component and determine percentage of total volatile HAPs and percentage of total nonvolatile HAPs .

3. We have assumed under Step # 3 that the volume of volatiles and volume of nonvolatiles (solids) in a liter of coating are additive. This may not be the case for your coating. However, the assumption is adequate for the purpose of this information collection request (ICR).

If the volume of volatiles in a coating is provided by the manufacturer, it should be used instead of the calculated value in Step#3.

4. If you know the volume of volatiles in a liter of coating and you do not know the volume of nonvolatiles (solids), you can determine the latter from the total volume of coating, by difference. This approximation is adequate for purposes of this ICR.