25 Pa. Code § 129.52 - Surface coating processes
VOC = (Wo)(Dc)/Vn
Where:
VOC = VOC content in lb VOC/gal of coating solids
Wo = Weight percent of VOC (Wv-Ww-Wex)
Wv = Weight percent of total volatiles (100%-weight percent solids)
Ww = Weight percent of water
Wex = Weight percent of exempt solvent(s)
Dc = Density of coating, lb/gal, at 25°C
Vn = Volume percent of solids of the as applied coating
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Where:
VOCA = VOC content in lb VOC/gal of coating solids for a dip coating, calculated on a 30-day rolling average basis
Woi = Percent VOC by weight of each as supplied coating (i) added to the dip coating process, expressed as a decimal fraction (that is 55% = 0.55)
Dci = Density of each as supplied coating (i) added to the dip coating process, in pounds per gallon
Qi = Quantity of each as supplied coating (i) added to the dip coating process, in gallons
Vni = Percent solids by volume of each as supplied coating (i) added to the dip coating process, expressed as a decimal fraction
WoJ = Percent VOC by weight of each thinner (J) added to the dip coating process, expressed as a decimal fraction
DdJ = Density of each thinner (J) added to the dip coating process, in pounds per gallon
QJ = Quantity of each thinner (J) added to the dip coating process, in gallons
VOCB = (Wo)/(Wn)
Where:
VOCB = VOC content in lb VOC/lb of coating solids
Wo = Weight percent of VOC (Wv-Ww-Wex)
Wv = Weight percent of total volatiles (100%-weight percent solids)
Ww = Weight percent of water
Wex = Weight percent of exempt solvents
Wn = Weight percent of solids of the as applied coating
O = (1 - E/V) x 100
Where:
V = The VOC content of the as applied coating, in lb VOC/gal of coating solids or lb VOC/lb of coating solids.
E = Table I limit in lb VOC/gal of coating solids or lb VOC/lb of coating solids.
O = Overall control efficiency.
Table I
Emission Limits of VOCs in Surface Coatings by Process Category Weight of VOC per Volume of Coating Solids
Surface Coating Process Category | lbs VOC per gal coating solids | kg VOC per liter coating solids |
1. Can coating | ||
(a) sheet basecoat | 4.62 | 0.55 |
(b) can exterior | 4.62 | 0.55 |
(c) interior body spray | 10.05 | 1.20 |
(d) two piece can end exterior | 10.05 | 1.20 |
(e) side-seam spray | 21.92 | 2.63 |
(f) end sealing compound | 7.32 | 0.88 |
2. Coil coating | 4.02 | 0.48 |
3. Fabric coating | 4.84 | 0.58 |
4. Vinyl coating | 7.69 | 0.92 |
5. Paper coating | 4.84 | 0.58 |
6. Automobile and light duty truck coating | ||
(a) prime coat | 2.60 | 0.31 |
(b) top coat | 4.62 | 0.55 |
(c) repair | 14.14 | 1.69 |
7. Metal furniture coating | 5.06 | 0.61 |
8. Magnet wire coating | 2.16 | 0.26 |
9. Large appliance coating | 4.62 | 0.55 |
Categories 1-9 were adopted on April 17, 1979 | ||
10. Miscellaneous metal parts & products | ||
(a) top coats for locomotives and heavy-duty trucks | 6.67 | 0.80 |
(b) hopper car and tank car interiors | 6.67 | 0.80 |
(c) pail and drum interiors | 10.34 | 1.24 |
(d) clear coatings | 10.34 | 1.24 |
(e) air-dried coatings | 6.67 | 0.80 |
(f) extreme performance coatings | 6.67 | 0.80 |
(g) all other coatings | 5.06 | 0.61 |
Category 10 was adopted on April 21, 1981 |
Weight of VOC per Weight of Coating Solids
lbs VOC per lb coating solids | kg VOC per kg coating solids | |
11. Wood furniture manufacturing operations | ||
(a) Topcoats and enamels | 3.0 | 3.0 |
(b) Washcoat | 14.3 | 14.3 |
(c) Final repair coat | 3.3 | 3.3 |
(d) Basecoats | 2.2 | 2.2 |
(e) Cosmetic specialty coatings | 14.3 | 14.3 |
(f) Sealers | 3.9 | 3.9 |
Category 11 was adopted on May 7, 1988 | ||
12. Shipbuilding and ship repair coatings |
Weight of VOC per Volume of Coating Less Water and Exempt Compoundsa b
lbs VOC per gallon coating less water and exempt compounds | grams VOC per liter coating less water and exempt compounds | |
(i) General use, including coal tar epoxy coatings | 2.83 | 340 |
(ii) Specialty coating | ||
(a) Air flask | 2.83 | 340 |
(b) Antenna | 4.42 | 530 |
(c) Antifoulant | 3.33 | 400 |
(d) Heat resistant | 3.50 | 420 |
(e) High-gloss | 3.50 | 420 |
(f) High-temperature | 4.17 | 500 |
(g) Inorganic zinc high build primer | 2.83 | 340 |
(h) Military exterior | 2.83 | 340 |
(i) Mist | 5.08 | 610 |
(j) Navigational aids | 4.58 | 550 |
(k) Nonskid | 2.83 | 340 |
(l) Nuclear | 3.50 | 420 |
(m) Organic zinc | 3.00 | 360 |
(n) Pretreatment wash primer | 6.50 | 780 |
(o) Repair and maintenance of thermoplastic coating of commercial vessels | 4.58 | 550 |
(p) Rubber camouflage | 2.83 | 340 |
(q) Sealant for thermal spray aluminum | 5.08 | 610 |
(r) Special marking | 4.08 | 490 |
(s) Specialty interior | 2.83 | 340 |
(t) Tack | 5.08 | 610 |
(u) Undersea weapons systems | 2.83 | 340 |
(v) Weld-through preconstruction primer | 5.42 | 650 |
Weight of VOC per Volume of Coating Solidsc
At temperature less than 4.5°C (40°F)d | At temperature equal to or greater than 4.5°C (40°F) | |||
lbs VOC per gallon coating solids | grams VOC per liter coating solids | lbs VOC per gallon coating solids | grams VOC per liter coating solids | |
(i) General use, including coal tar epoxy coatings | 6.07 | 728 | 4.76 | 571 |
(ii) Specialty coating | ||||
(a) Air flask | 6.07 | 728 | 4.76 | 571 |
(b) Antenna | 12.01 | 1,439 | 12.01 | 1,439 |
(c) Antifoulant | 8.10 | 971 | 6.38 | 765 |
(d) Heat resistant | 8.92 | 1,069 | 7.02 | 841 |
(e) High-gloss | 8.92 | 1,069 | 7.02 | 841 |
(f) High-temperature | 13.33 | 1,597 | 10.32 | 1,237 |
(g) Inorganic zinc high build primer | 6.07 | 728 | 4.76 | 571 |
(h) Military exterior | 6.07 | 728 | 4.76 | 571 |
(i) Mist | 18.64 | 2,235 | 18.64 | 2,235 |
(j) Navigational aids | 13.33 | 1,597 | 13.33 | 1,597 |
(k) Nonskid | 6.07 | 728 | 4.76 | 571 |
(l) Nuclear | 8.92 | 1,069 | 7.02 | 841 |
(m) Organic zinc | 6.69 | 802 | 5.26 | 630 |
(n) Pretreatment wash primer | 92.58 | 11,095 | 92.58 | 11,095 |
(o) Repair and maintenance of thermoplastic coating of commercial vessels | 13.33 | 1,597 | 13.32 | 1,597 |
(p) Rubber camouflage | 6.07 | 728 | 4.76 | 571 |
(q) Sealant for thermal spray aluminum | 18.65 | 2,235 | 18.65 | 2,235 |
(r) Special marking | 9.83 | 1,178 | 9.83 | 1,178 |
(s) Specialty interior | 6.07 | 728 | 4.76 | 571 |
(t) Tack | 18.65 | 2,235 | 18.65 | 2,235 |
(u) Undersea weapons systems | 6.07 | 728 | 4.76 | 571 |
(v) Weld-through preconstruction primer | 24.07 | 2,885 | 24.07 | 2,885 |
a The limits are expressed in two sets of equivalent units: pounds (lbs) per gallon and grams per liter. Either set of limits may be used to demonstrate compliance.
b To convert from grams per liter to pounds (lbs) per gallon, multiply the limit by (3.785 liter/gallon) (1/453.6 pound/gram) or 1/120. For compliance purposes, metric units define the standards.
c VOC limits expressed in units of mass of VOC per volume of solids were derived from the VOC limits expressed in units of mass of VOC per volume of coating less water and exempt compounds by assuming the coating contains no water or exempt compounds and that the volumes of all components within the coating are additive.
d These limits apply during cold weather time periods, that is, temperatures below 4.5°C (40°F). Cold weather allowances are not given to coatings in categories that allow less than 40% solids (nonvolatiles) content by volume. These coatings are subject to the single limit regardless of weather conditions and temperatures.
Category 12 was adopted on January 21, 2023.
Notes
The provisions of this § 129.52 issued under section 1920-A of The Administrative Code of 1929 (71 P.S. § 510-20); and issued and amended under section 5 of the Air Pollution Control Act (35 P.S. § 4005).
This section cited in 25 Pa. Code § 121.1 (relating to definitions); 25 Pa. Code § 129.51 (relating to general); 25 Pa. Code § 129.52a (relating to control of VOC emissions from large appliance and metal furniture surface coating processes); 25 Pa. Code § 129.52b (relating to control of VOC emissions from paper, film and foil surface coating processes); 25 Pa. Code § 129.52d (relating to control of VOC emissions from miscellaneous metal parts surface coating processes, miscellaneous plastic parts surface coating processes and pleasure craft surface coatings); 25 Pa. Code § 129.54 (relating to seasonal operation of auxiliary incineration equipment); 25 Pa. Code § 129.66 (relating to compliance schedules and final compliance dates); 25 Pa. Code § 129.67 (relating to graphic arts systems); 25 Pa. Code § 129.73 (relating to aerospace manufacturing and rework); 25 Pa. Code § 129.75 (relating to mobile equipment repair and refinishing); 25 Pa. Code § 129.91 (relating to control of major sources of NOx and VOCs); 25 Pa. Code § 129.96 (relating to applicability); 25 Pa. Code § 129.101 (relating to general provisions and applicability); and 25 Pa. Code § 129.111 (relating to applicability).
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