Bay Area Air Quality Management District December 2, 2009 

8-50-1 

REGULATION 8 

ORGANIC COMPOUNDS 

RULE 50 

POLYESTER RESIN OPERATIONS 

INDEX 

8-50-100 GENERAL 

8-50-101 Description 

8-50-110 Deleted December 2, 2009 

8-50-200 DEFINITIONS 

8-50-201 Air-assisted Airless Spray 

8-50-202 Airless Spray 

8-50-203 Approved Emission Control System 

8-50-204 Boat Manufacturing 

8-50-205 Catalyzing Agent 

8-50-206 Cleaning Products 

8-50-207 Close-mold System 

8-50-208 Composite Materials 

8-50-209 Composite Products 

8-50-210 Compression Molding 

8-50-211 Corrosion-resistant Resin 

8-50-212 Cross-linking 

8-50-213 Electrostatic Air Spray 

8-50-214 Filament Application 

8-50-215 Filler 

8-50-216 Fire Retardant Material 

8-50-217 Gel Coat 

8-50-218 High Strength Resin 

8-50-219 High-Volume, Low-pressure Spray 

8-50-220 Hopper Spray Gun 

8-50-221 Inhibitor 

8-50-222 Injection Molding 

8-50-223 Key System Operating Parameter 

8-50-224 Lamination Resin 

8-50-225 Manual Application 

8-50-226 Marble Resin 

8-50-227 Monomer 

8-50-228 Non-atomizing Mechanical Application 

8-50-229 Open-mold System 

8-50-230 Overall Efficiency 

8-50-231 Polyester 

8-50-232 Polyester Resin 

8-50-233 Polyester Resin Operations 

8-50-234 Polymer 

8-50-235 Polymerize 

8-50-236 Primer Gel Coat 

8-50-237 Pultrusion 

8-50-238 Reinforcement Fiber 

8-50-239 Repair 

8-50-240 Resin 

8-50-241 Resin Bath 

8-50-242 Solid Surface Resin 

8-50-243 Specialty Gel Coat 
Bay Area Air Quality Management District December 2, 2009 

8-50-2 

8-50-244 Tooling Resin 

8-50-245 Touch-up 

8-50-246 Tub/Shower Resin 

8-50-247 Vapor Suppressant 

8-50-248 Vinyl Ester Resin 

8-50-249 Volatile Organic Compound (VOC) 

8-50-300 STANDARDS 

8-50-301 Process Material Requirements 

8-50-302 Application Requirements 

8-50-303 Emission Control Requirement 

8-50-304 Corrosion-resistant Materials 

8-50-305 Surface Preparation and Clean-up Solvent 

8-50-306 Equipment Requirements 

8-50-307 Gel Coat Requirement 

8-50-308 Prohibition of Specification Requirement 

8-50-309 Compliance Statement Requirement 

8-50-400 ADMINISTRATIVE REQUIREMENTS (not included) 

8-50-500 MONITORING AND RECORDS 

8-50-501 Recordkeeping Requirements 

8-50-502 Approved Emission Control System, Recordkeeping Requirements 

8-50-503 Emission Control System Monitoring 

8-50-600 MANUAL OF PROCEDURES 

8-50-601 Analysis of Samples 

8-50-602 Determination of Emissions 
Bay Area Air Quality Management District December 2, 2009 

8-50-3 

REGULATION 8 

ORGANIC COMPOUNDS 

RULE 50 

POLYESTER RESIN OPERATIONS 

(Adopted December 5, 1990) 

8-50-100 GENERAL 

8-50-101 Description: The purpose of this Rule is to limit organic compound emissions from 

the manufacturing, fabrication, rework, repair, and touch-up of composite products 

made of polyester resin and gel coat. 

8-50-110 Deleted December 2, 2009 

8-50-200 DEFINITIONS 

8-50-201 Air Assisted Airless Spray: Equipment used to apply materials by means of fluid 

pressure to atomize coating and air pressure at between 0.1 and 10 psig of air 

pressure in order to adjust the spray pattern. 

(Amended, Renumbered December 2, 2009) 

8-50-202 Airless Spray: Equipment used to apply materials by use of fluid pressure without 

atomizing air, including heated airless spray. 

(Renumbered December 2, 2009) 

8-50-203 Approved Emission Control System: A system for reducing emissions of VOC to 

the atmosphere, consisting of a control device and a collection system that achieves 

the overall abatement efficiency specified in Section 8-50-303 at all times during 

operation of the equipment. 

(Adopted 6/15/94; Amended and Renumbered 12/2/09) 

8-50-204 Boat Manufacturing: The manufacturing of boat hulls or decks from fiberglass, or 

the construction of boats from pre-manufactured hulls or decks, or the fabrication of 

molds to manufacture fiberglass hulls or decks. For the purposes of this rule, a 

polyester resin operation that manufactures only boat parts, such as hatches, seats, 

or lockers, or boat trailers, or a polyester resin facility that repairs boats and boat 

parts, is not considered a boat manufacturing facility. 

(Adopted December 2, 2009) 

8-50-205 Catalyzing Agent: A substance added to a resin to initiate or increase the rate of a 

chemical reaction such as polymerization. Catalyzing agents include, but are not 

limited to, peroxide initiators, amines, amides, and anhydrides. 

(Amended, Renumbered December 2, 2009) 

8-50-206 Cleaning Products: Materials used to clean hands, tools, molds, application 

equipment, work area, and other process-related equipment in connection with 

polyester resin operations. 

(Amended, Renumbered December 2, 2009) 

8-50-207 Closed-mold System: A system of forming composite products from by placing 

composite materials in a confining cavity and applying pressure and/or heat to shape 

the product. Compression molds, liquid-injection molds, pultrusion (when using 

closed resin baths, preform, or direct die injection), Resin Transfer Molding and 

vacuum infusion molding are examples of closed-mold systems. 

(Amended, Renumbered December 2, 2009) 

8-50-208 Composite Materials: Individual components that, combined, make up the 

composite product. Composite materials include resins, gel coats, molding 

compounds, thinners, catalyzing agents, binders, fillers, reinforcement fibers, other 

reinforcement materials, and any other material added to enhance the properties of 

the composite product. 

(Adopted December 2, 2009) 

8-50-209 Composite Products: For the purposes of this Rule, composite products are 

products that are fabricated from polyester resins and composite materials. 

(Adopted December 2, 2009) 
Bay Area Air Quality Management District December 2, 2009 

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8-50-210 Compression Molding: A method of forming an object in which composite 

materials, such as molding compounds, are placed in an open, heated mold cavity. 

The mold is closed and pressure is applied to force the polyester resin into contact 

with all mold areas. Heat and pressure are maintained until the material has cured. 

(Adopted December 2, 2009) 

8-50-211 Corrosion-Resistant Resin: A resin or composite material used to manufacture a 

product that is required to meet a corrosion resistant industry standard, as defined in 

40 CFR 63.5935, or a food contact industry standard or used to manufacture a 

product with corrosion resistant end use applications involving continuous or 

temporary chemical exposure. 

(Amended, Renumbered December 2, 2009) 

8-50-212 Cross-linking: The process of chemically linking two or more polymer chains to 

create a three-dimensional or network polymer. 

(Amended, Renumbered December 2, 2009) 

8-50-213 Electrostatic Air Spray: Equipment used to apply materials by charging atomized 

coating particles that are deposited to a grounded substrate by electrostatic 

attraction. 

(Amended, Renumbered December 2, 2009) 

8-50-214 Filament Application: A method of applying resin to an open mold that involves 

feeding reinforcement fibers through a resin bath and winding the resin-impregnated 

fibers on a rotating mandrel. 

(Adopted December 2, 2009) 

8-50-215 Filler: A non-reactive constituent of a composite product. Fillers include hollow glass 

spheres, fibers, particulates, clays, silicates, talcs, carbonates, carbon black, chalk, 

titanium dioxide, graphite, molybdenum disulfide, PTFE, barium sulfate, aluminum, 

and copper, and may impart properties such as color, magnetic, smoothness, 

lubrication, thermal or electric properties. 

(Adopted December 2, 2009) 

8-50-216 Fire Retardant Resin: Resin that is used to make composite products specifically 

designed to be a low flame spread/low smoke product, as defined in 40 CFR 

63.5935. 

(Adopted December 2, 2009) 

8-50-217 Gel Coat: A pigmented or clear resin material that functions as a surface coating to 

provide cosmetic enhancement or resistance to degradation, ultraviolet radiation, or 

water or chemical adsorption. 

(Amended, Renumbered December 2, 2009) 

8-50-218 High Strength Resin: Resin used to manufacture composite products requiring a 

tensile strength of 10,000 psi or more for a minimal casting thickness of one-eighth 

inch. 

(Adopted December 2, 2009) 

8-50-219 High-Volume Low-Pressure (HVLP) Spray: Equipment used to apply materials by 

means of a gun that operates at between 0.1 and 10 psig of air pressure. 

(Amended, Renumbered December 2, 2009) 

8-50-220 Hopper Spray Gun: Equipment which uses air pressure and an internal mix 

atomization process to apply a blend of thick, viscous, crushed or pulverized material 

mixed with resin or gel coat. 

(Adopted December 2, 2009) 

8-50-221 Inhibitor: A substance used to slow down or prevent a chemical reaction, such as 

polymerization. 

(Amended, Renumbered December 2, 2009) 

8-50-222 Injection Molding: A high-volume method of forming an object by forcing composite 

material from an external heated chamber through a sprue, runner, or gate into a 

cavity of a closed mold by means of a pressure gradient. 

(Adopted December 2, 2009) 

8-50-223 Key System Operating Parameter: An emission control system operating 

parameter, such as temperature, flow rate or pressure, that ensures operation of the 

abatement equipment within manufacturer specifications and compliance with the 

standard in Section 8-50-303. 

(Adopted 6/15/94; Renumbered 12/2/09) 
Bay Area Air Quality Management District December 2, 2009 

8-50-5 

8-50-224 Lamination Resin: A resin used to fabricate a composite product made up of layers 

of reinforcement fibers and resins. Boats hulls, surfboards, and automotive panels 

are typically made of lamination resins. 

(Adopted December 2, 2009) 

8-50-225 Manual Application: The application of resin to an open mold using a hand lay-up 

technique. Components of successive plies of resin-impregnated reinforcement 

fibers are applied using hand tools such as brushes and rollers. 

(Adopted December 2, 2009) 

8-50-226 Marble Resin: Resin filled with additives to create a polymer matrix that is cast 

(poured) over a mold. This cultured marble process is used to fabricate composite 

products resembling natural stone such as marble, onyx, or granite. 

(Adopted December 2, 2009) 

8-50-227 Monomer: A small molecule used as a cross-linking agent. Monomers partially 

combine with themselves or with other compounds chemically, to become part of a 

cured resin (polymer). Monomers include, but are not limited to, styrene and methyl 

methacrylate. 

(Amended, Renumbered December 2, 2009) 

8-50-228 Non-atomizing Mechanical Application: An application technique, other than a 

manual application technique, to apply resins or gel coats to molds. Methods include 

flow coaters, pressure fed rollers, impingement spray, or any other mechanical 

techniques described in 40 CFR 63.5935. 

(Adopted December 2, 2009) 

8-50-229 Open-mold System: A process of manufacturing composite products by applying 

composite materials in a one-sided cavity. The product being manufactured is 

exposed to the ambient air. 

(Adopted December 2, 2009) 

8-50-230 Overall Efficiency: The efficiency of an approved emission control system, 

measured by the collection system’s efficiency multiplied by the destruction efficiency 

of the control device, expressed as a percentage. 

(Adopted December 2, 2009) 

8-50-231 Polyester: A synthetic, long-chain polymeric ester produced mainly by reaction of 

dibasic acids with dihydric alcohols. 

(Amended, Renumbered December 2, 2009) 

8-50-232 Polyester Resin: A resin used to fabricate composite products. Polyester resins 

include but are not limited to, unsaturated polyester resins, such as orthophthalic, 

isopthalic, halogenated, dicyclopentadiene, bisphenol A and furans. For the 

purposes of this rule, vinyl ester resins are polyester resins. 

(Amended, Renumbered December 2, 2009) 

8-50-233 Polyester Resin Operations: The fabrication, rework, repair, or touch-up of 

composite products for commercial, military, or industrial uses by mixing, pouring, 

manual application, molding, impregnating, injecting, forming, spraying, pultrusion, 

filament winding, centrifugally casting, or corn-forming with polyester resins. 

(Amended, Renumbered December 2, 2009) 

8-50-234 Polymer: Chemical compounds that consist of a large number of repeating 

monomers. 

(Amended, Renumbered December 2, 2009) 

8-50-235 Polymerize: Transformation from a liquid to a solid or semi-solid state to achieve 

desired product physical properties, including hardness. 

(Renumbered December 2, 2009) 

8-50-236 Primer Gel Coat: A gel coat that functions as a primer for subsequent coating on 

the product after it is removed from the mold. 

(Adopted December 2, 2009) 

8-50-237 Pultrusion: A continuous manufacturing process for composite products that have a 

uniform cross-sectional shape. Continuous strands of fiber-reinforcing material are 

pulled through a strand-tensioning device into a resin impregnation chamber or bath 

and then pulled through a shaping die. 

(Adopted December 2, 2009) 

8-50-238 Reinforcement Fiber: A multifilament material of glass or other fibrous material, 

such as carbon, boron, metal, kevlar, and amid polymer, that is used to reinforce 

composite products. 

(Amended, Renumbered December 2, 2009) 
Bay Area Air Quality Management District December 2, 2009 

8-50-6 

8-50-239 Repair: A process that requires the addition of polyester resin or other composite 

material to portions of a previously-fabricated product in order to mend minor 

structural damage. 

(Amended, Renumbered December 2, 2009) 

8-50-240 Resin: Any class of organic polymers of natural or synthetic origin used to 

encapsulate and bind together reinforcement fibers and/or fillers in the formulation of 

composite products. 

(Amended, Renumbered December 2, 2009) 

8-50-241 Resin Bath: A tray or chamber that contains initiated resin for a pultrusion or 

impregnating process. 

(Adopted December 2, 2009) 

8-50-242 Solid Surface Resin: A resin containing fillers and additives that is used to fabricate 

products that are non-porous and have a homogeneous composition throughout. 

Solid surface resins are used primarily in the cast polymer segment of the composite 

industry. 

(Adopted December 2, 2009) 

8-50-243 Specialty Gel Coat: A gel coat that is used in conjunction with a composite product 

that is required to have fire retardant properties, is corrosion-resistant, is a highstrength resin, or is used in a tooling application. 

(Adopted December 2, 2009) 

8-50-244 Tooling Resin: Resin used to produce a mold, or a gel coat to form a surface layer 

on a mold, for the fabrication of a composite product. 

(Adopted December 2, 2009) 

8-50-245 Touch-up: The application of resin or gel coat to cover minor cosmetic imperfections 

that occur during fabrication or field installations. 

(Amended, Renumbered December 2, 2009) 

8-50-246 Tub/Shower Resin: Resins used to fabricate tubs, showers, and bathware fixtures. 

(Adopted December 2, 2009) 

8-50-247 Vapor Suppressant: A substance that is added to resin to minimize the outward 

diffusion of monomer vapor into the atmosphere. 

(Amended, Renumbered December 2, 2009) 

8-50-248 Vinyl Ester Resin: Resins produced from the esterification of an epoxy with a 

monocarboxylic acid. 

(Adopted December 2, 2009) 

8-50-249 Volatile Organic Compound (VOC): Any organic compound (excluding methane, 

carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates and 

ammonium carbonate) that could be emitted during use, application, curing or drying 

of a cleaning product, gel coat, or polyester resin. 

249.1 For purposes of calculating the VOC content of a polyester resin or gel coat, 

neither water nor any of the following non-precursor organic compounds: 

acetone 

parachlorobenzotrifluoride (PCBTF)

cyclic, branched or linear completely methylated siloxanes (VMS) 

shall be considered to be part of the polyester resin or gel coat. 

249.2 For the purposes of calculating the VOC content of a cleaning product 

subject to Section 8-50-305.4, water and any of the non-precursor organic 

compounds listed in subsection 8-50-249.1, shall neither be considered part 

of the volume of the cleaning product, nor shall be considered to be part of 

the VOC content of the cleaning product. 

(Amended 12/20/95; 11/6/96; Amended, Renumbered 12/2/09) 

8-50-300 STANDARDS 

8-50-301 Process Material Requirements: Until October 1, 2010, a polyester resin operation 

shall use one or more of the following emission reducing methods except as provided 

in Section 8-50-304: 

301.1 Use polyester resin material with a monomer content of no greater than 35 

percent by weight. 

301.2 Use a resin containing vapor suppressant, such that weight loss from VOC 

emissions do not exceed 60 grams per square meter of exposed surface 

area during resin polymerization. 
Bay Area Air Quality Management District December 2, 2009 

8-50-7 

301.3 Use a closed-mold system. 

 Effective October 1, 2010, an owner or operator shall use one or more of the 

following VOC emission reduction methods: 

301.4 A closed-mold system, 

301.5 A resin containing vapor suppressant, that prevents weight loss from VOC 

emissions to no more than 50 grams per square meter of exposed surface 

area during resin polymerization; or, 

301.6 Except as provided in Section 8-50-301.7, a polyester resin or gel coat in an 

open mold with a monomer content no greater than the applicable limit 

specified in Table 1. 

TABLE 1 

Gel Coats and Resins Monomer Percentage 

by Weight

Gel Coats 

Clear Gel Coats 

Marble Resin Gel Coats 42% 

Boat Manufacturing Gel Coats 48% 

All Other Clear Gel Coats 44% 

Pigmented Gel Coats 

White and Off-White Gel Coats 30% 

Non-White Boat Manufacturing Gel Coats 33% 

Other Non-White Gel Coats 37% 

Primer Gel Coats 28% 

Specialty Gel Coats 48% 

Resins 

Marble Resins 10% with fillers or 

32% without fillers*

Solid Surface Resins 17% 

Tub/Shower Resins 24% with fillers or 

35% without fillers*

Boat Manufacturing (atomized) 28% 

Boat Manufacturing (non-atomized) 35% 

Lamination Resins 31% with fillers or 

35% without fillers*

Fire Retardant Resins 38% 

Corrosion Resistant, High Strength and Tooling 

Resins 

Non-atomizing Mechanical Application 46%**

Filament Application 42%**

Manual Application 40%**

Other Resins 35% 
Bay Area Air Quality Management District December 2, 2009 

8-50-8 

Monomer percent by weight includes the addition of any VOC-containing materials. 

* An owner or operator of a polyester resin operation may meet the monomer content limits by 

adding filler to a resin to reduce the monomer content to the applicable limit or by using resin with 

a monomer content that complies with the applicable limit without the addition of fillers. 

**If the owner or operator manufactures a composite product by using more than one technology 

to apply corrosion-resistant, high strength or tooling resins, the highest permissible resin 

monomer content is the applicable limit. 

301.7 Resins and gel coats used to touch up, repair or install a composite product, 

may have a monomer content limit up to 10% more than the applicable limit 

set forth in Table 1 provided the resins or gel coats are applied by hand-held 

atomized spray technologies that operate with a container that is part of the 

gun with a maximum capacity of 1 quart. 

(Amended December 2, 2009) 

8-50-302 Application Requirements: A polyester resin operation shall only apply resins and 

gel coats to open molds by one or more of the following techniques:

302.1 Until October 1, 2011: 

1.1 Atomized spray techniques: Airless Spray, Air-assisted Airless Spray, 

Electrostatic Air Spray, High-Volume, Low-pressure Spray; 

1.2 Non-atomizing mechanical application techniques; 

1.3 Hopper guns; 

1.4 Non-spray techniques: Filament Application, Pressure-fed Roller, 

Resin Impregnation; 

1.5 Manual application techniques. 

302.2 Effective October 1, 2011, an owner or operator may only apply a resin by 

the techniques listed in Sections 1.2 through 1.5, above. 

302.3 An owner or operator may use a resin to touch up, repair or install a 

composite product using any of the above application techniques. 

(Amended December 2, 2009) 

8-50-303 Approved Emission Control System Requirements: The requirements of 

Sections 8-50-301 and 302 shall not apply to polyester resin operations controlled by 

an emission control system that is installed and properly operated, meets the 

requirements of Regulation 2, Rule 1, and has an overall efficiency of at least 85 

percent overall on a mass basis. 

 (Amended 6/15/94; 12/2/09) 

8-50-304 Corrosion-Resistant Materials: Until October 1, 2010, polyester resin operations 

using corrosion-resistant materials to manufacture products for corrosive or fire 

retardant service shall use a polyester resin material with a monomer content of no 

greater than 50 percent by weight. Effective October 1, 2010, the applicable limit in 

Section 8-50-301, Table 1 applies. 

(Amended December 2, 2009) 

8-50-305 Surface Preparation and Cleaning Products: The requirements of this section 

shall apply to any polyester resin operation using for surface preparation and the 

cleaning of application equipment, machinery, tools, parts, products, and general 

working areas. 

305.1 Polyester resin operations shall store all resin materials, gel coats, catalyzing 

agents, resin thinners, cleaning products and any unused VOC-containing 

materials in closed containers which may only be opened to access their 

contents. 

305.2 Polyester resin operations shall use self-closing containers for the disposal of 

all VOC containing composite materials, cleaning products, VOC-containing 

waste, and any other unused VOC containing materials in such a manner as 

to effectively control VOC emissions to the atmosphere. 

305.3 Polyester resin operations shall not use cleaning products to clean spray 

equipment including spray lines unless equipment for collecting the cleaning 

product material and minimizing their evaporation to the atmosphere is used. 

305.4 Effective October 1, 2010, polyester resin operations shall use cleaning 

products that contain no greater than 25 grams of VOC per liter of material. 
Bay Area Air Quality Management District December 2, 2009 

8-50-9 

305.5 Notwithstanding the provisions of Regulation 8, Rule 16, polyester resin 

operations may use acetone in a cold cleaner provided the following 

provisions are complied with: 

5.1 The cold cleaner and any emission control device associated with the 

cold cleaner shall be operated and maintained in proper working order. 

5.2 The cold cleaner shall be equipped with a self-closing cover, with no 

visible gaps, that minimizes evaporation. 

5.3 The cover must remain closed except when putting parts into or taking 

parts out of the cleaner. 

5.4 All liquid solvent shall be drained back into the container when 

removing parts. 

5.5 The cold cleaner may be used to soak parts, but parts must be wiped, 

brushed or otherwise worked on outside of the cleaner. 

5.6 Leaks shall be repaired before the end of the work day or the cold 

cleaner shall be drained and shut down until the leak is repaired. 

5.7 The cold cleaner shall not be heated. 

5.8 Solvent, including waste solvent, shall not be stored or disposed of in a 

manner that will cause or allow evaporation into the atmosphere. 

5.9 Cleaning of porous or absorbent materials in cold cleaners is 

prohibited. 

5.10 A permanent label listing the applicable operating requirements 

contained in this section, shall be posted in a conspicuous location 

near the cold cleaner. 

(Amended December 2, 2009) 

8-50-306 Equipment Requirements: All resin baths and wet baths shall be covered to reduce 

organic compound emissions. Pultrusion operations shall be covered, except as 

allowed by 40 CFR 63.5830. 

(Amended December 2, 2009) 

8-50-307 Gel Coat Requirement: Until October 1, 2010, an owner or operator of a polyester 

resin operation shall not use a gel coat that contains more than 250 grams of volatile 

compounds per liter of coating applied. 

(Amended December 2, 2009) 

8-50-308 Prohibition of Specification Requirement: No person shall solicit, require or 

specify use of a composite material if such use results in a violation of any of the 

provisions of this rule. The prohibition of the section shall apply to all oral and written 

contracts under the terms of which any use of any composite material that is subject 

to the provisions of this rule is to be used. 

(Adopted December 2, 2009) 

8-50-309 Compliance Statement Requirement: The manufacturer of any VOC-containing 

composite material sold or used in this District shall supply a designation of the 

percent monomer content by weight or the percent VOC content, as applicable, on 

data sheets, specification sheets or compliance certifications. 

(Adopted December 2, 2009) 

8-50-500 MONITORING AND RECORDS 

8-50-501 Recordkeeping Requirements: Polyester resin operations, including touch ups, 

repairs, and installations performed in the field, shall comply with the following 

recordkeeping requirements: 

501.1 Maintain a current list of gel coats, resins, resin thinners, catalyzing agents, 

and cleaning products used. 

501.2 Maintain a current list of: 

a. the monomer content percent by weight for each polyester resin and 

gel coat used; 

b. the VOC content in grams per liter for each cleaning product and VOCcontaining material added to a polyester resin and gel coat; and, 

c. manufacturer’s specifications on each type of application equipment 

used. 
Bay Area Air Quality Management District December 2, 2009 

8-50-10 

501.3 For all vapor suppressed resins, maintain a current list of certifications from 

the manufacturers that the resins are vapor-suppressed to meet the 

applicable standards in this rule. 

501.4 Maintain records that specify on a daily basis: 

a. the type and amount of each of the polyester resin, gel coat, and 

cleaning products used. If VOC-containing materials (such as resin 

thinners) are added to a polyester resin or gel coat, the amount of 

materials added shall be recorded, 

b. the volume of resin and cleaning materials used for touch-up and 

repair. 

Alternatively, records may be kept on a monthly basis provided the polyester 

resin operation is not subject to a daily limit in any District rule or permit. Any 

violation shall be deemed to have occurred on each operating day of the 

month. 

501.5 The owner or operator shall retain all records and lists required by this 

Section and shall make them available for inspection by the APCO upon 

request, for the previous 36-month period. 

(Amended December 2, 2009) 

8-50-502 Approved Emission Control System, Recordkeeping Requirements: Any owner 

or operator subject to Section 8-50-303 shall: 

502.1 Record on a daily basis the type and amount of all resins, gel coats and 

cleaning products used. 

502.2 Record key system operating parameters, as defined in Section 8-50-224, on 

a daily basis. 

502.3 Retain and have such records available for inspection by the APCO for the 

previous 36-month period. 

(Adopted 6/15/94; Amended 12/2/09) 

8-50-503 Emission Control System Monitoring: Any owner or operator who uses an 

emission control system which is subject to the provisions of Section 8-50-303 shall 

install readily visible parametric monitoring devices to monitor the operating 

parameters of an emission control system at all times during operation. 

(Adopted December 2, 2009) 

8-50-600 MANUAL OF PROCEDURES 

8-50-601 Analysis of Samples: Samples from polyester resin operations shall be analyzed 

as follows: 

601.1 Samples of gel coat as specified in Sections 8-50-307 shall be analyzed as 

prescribed in the Manual of Procedures, Volume III, Method 26. 

601.2 Samples of cleaning products as specified in Section 8-50-305.4 shall be 

analyzed as prescribed in the Manual of Procedures, Volume III, Method 31 

or by South Coast Air Quality Management District Laboratory Method 313-

91. 

601.3 Samples of polyester resin material as specified in Sections 8-50-301 and 

304 shall be analyzed as prescribed in the Manual of Procedures, Volume III, 

Method 23: Determination of Volatile Emissions From Polyester Resins, or 

Method 39: Determination of Styrene Monomer Content of Polyester Resin 

Material, or by South Coast Air Quality Management District Laboratory 

Method 312-91. 

601.4 Samples containing parachlorobenzotrifluorides shall be analyzed as 

prescribed in the Manual of Procedures (MOP), Vol. III, Method 41. Samples 

containing volatile methylsiloxanes shall be analyzed as prescribed in the 

MOP, Vol. III, Method 43. The quantity of methyl acetate, acetone, 

parachlorobenzotriflouride shall be determined by using ASTM Method 

D6133-02: “Standard Test Method for Acetone, p-Chlorobenzotrifluoride, 

Methyl Acetate or t-Butyl Acetate Content of Solventborne and Waterborne 

Paints, Coatings, Resins, and Raw Materials by Direct Injection Into a Gas 

Chromatograph.” 

(Amended 11/6/96; 12/2/09) 
Bay Area Air Quality Management District December 2, 2009 

8-50-11 

8-50-602 Determination of Emissions, Operations with a Control Device: Emissions of 

volatile organic compounds and monomers from polyester resin operations controlled 

by an emission control system shall be determined as follows: 

602.1 Capture efficiency shall be determined as specified in 40 CFR 51, Appendix 

M, Test Methods 204 – 204F, as applicable. 

602.2 Control device destruction efficiency shall be determined as specified in the 

Manual of Procedures, Volume IV, ST-7 or EPA Method 25 or 25A. 

602.3 For the determination of control device destruction efficiency, any nonprecursor organic compound specified in Section 8-50-220 shall be included 

as a volatile organic compound. 

602.4 The overall efficiency of an emission control system, expressed as a 

percentage, shall be calculated according to the following equation: 

 OE = [CE x DE]/100 

 Where: 

OE = Overall efficiency 

CE = Capture efficiency 

DE = Control device destruction efficiency 

602.5 VOC or monomer emissions, as measured by any of the reference test 

methods, may be used as evidence of exceedances of standards of this rule. 

 (Amended 6/15/94; 11/6/96; 12/2/09)