SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 67.12 - POLYESTER RESIN OPERATIONS
(Effective 3/14/89: Rev. Adopted & Effective 5/15/96)
Except as otherwise provided in Section (b), this rule is applicable to polyester resin operations. Polyester
resin operations subject to this rule shall not be subject to Rule 66.
- Except for marine vessel repair operations, the provisions of this rule shall not apply to any polyester resin
operations where the combined consumption of polyester resins, including corrosion resistant resin, fire retardant
resin, gel coat, and cleaning materials is less than 1 gallon for each operating day.
- The provisions of this rule shall not apply to any marine vessel repair operation using polyester resin materials
where the combined consumption of polyester resins, including corrosion resistant resin, fire retardant resin,
gel coat, and cleaning materials is less than 0.5 gallon for each operating day.
It shall be the responsibility of any person claiming either of the exemptions specified in Subsections (b)(1)
or (b)(2) to maintain daily records necessary for the District to determine the applicability of such an exemption.
The records shall be maintained on site for at least three years and shall be made available to the District upon
- The provisions of this rule shall not apply to coatings subject to Rules 67.3, 67.0 or 67.11.
(c) DEFINITIONS (Rev. Effective 5/15/96)
For the purpose of this rule, the following definitions shall apply:
- "Catalyst" means a substance added to the resin to accelerate the rate of curing.
- "Cleaning Materials" means materials containing volatile organic compounds (VOCÕs)
used for the cleaning of hands, tools, molds and spray equipment associated with polyester resin operations.
- "Closed Mold Operation" means a method of forming objects from polyester resins by placing
the material in a confining mold cavity and applying pressure and/or heat.
- "Controlled Enclosure" means a structure having at least three sides and a roof and which
is designed to capture process emissions to meet the requirements of all District prohibitory standards (e.g.,
Rules 50, 51, 52, 71, etc.).
- "Controlled Process" means a modification to a dry sanding, grinding or cutting operation
which uses water sprays, vacuum devices or other techniques to control the emission of particulates to the atmosphere
to meet the requirements of all District prohibitory standards (e.g., Rules 50, 51, 52, 71, etc.).
- "Corrosion Resistant Resin" means a halogenated, furan, bisphenol A, vinyl ester, or isophthalic
resin which is used to make products for exposure to corrosive, caustic and/or acidic agents.
- "Cross-Linking" means the process of joining two or more polymer chains together.
- "Cure" means the polymerization, i.e. the transformation from a liquid to a solid state, to
achieve desired product physical properties, including hardness.
- "Exempt Compound" means the same as defined in Rule 2. (Rev. Effective 5/15/96)
(i) cyclic, branched, or linear, completely fluorinated alkanes;
(ii) cyclic, branched, or linear, completely fluorinated ethers with no unsaturations;
(iii) cyclic, branched, or linear, completely fluorinated tertiary amines with no unsaturations; and
(iv) sulfur containing perfluorocarbons with no unsaturations and with sulfur bonds only to carbon and fluorine.
- "Fiberglass" means a fiber similar in appearance to wool or cotton fiber but made from glass.
- "Fire Retardant Resin" means a resin designed for the purpose of delaying the spread of combustion.
- "Gel Coat" means a polyester resin surface coat, either colored or clear, providing a cosmetic
enhancement and improvement to exposure resistance.
- "High-Volume Low-Pressure (HVLP) Spray" means a coating application method using pressurized
air at a permanent pressure between 0.1 and 10.0 psig, not to exceed 10.0 psig, measured at the air cap of the
coating application system, and a permanent liquid coating pressure of not more than 50 psig.
- "Inhibitor" means a substance designed to slow down or prevent a chemical reaction.
- "Monomer" means an organic compound that combines with itself or other similar compounds by
a cross-linking reaction to become a part of a cured thermosetting resin.
- "Polyester" means a complex polymeric ester, derived from difunctional acids and alcohols,
which is dissolved in a monomer.
- "Polyester Resin Operation" means any of the following: mixing, pouring, hand lay-up, injection,
forming, spraying, and curing of polyester resin materials excluding injection molding.
- "Polyester Resin Materials" means unsaturated polyesters, cross-linking agents, catalysts,
gel coats, inhibitors, and any other material containing VOC used in a polyester resin operation.
- "Polymer" means a large chemical chain composed of identical cross-linked groups, such as
- "Reclamation System" means equipment capable of reclaiming spent cleaning materials for reuse.
Reclamation may be done onsite or by using an offsite commercial reclamation facility.
- "Repair" means the addition of polyester resin to portions of a previously fabricated product
in order to mend mechanical damage which occurs after the normal fabrication process.
- "Resin" means any of a class of organic polymers of natural or synthetic origin used in reinforced
products to surround and hold fibers, and is solid or semi-solid in the cured state.
- "Touch-up" means that portion of the polyester resin operation that is necessary to cover
- "Vapor Suppressed Resin" means a resin which has been modified to minimize the weight loss
from VOC emissions during polymerization.
- "Volatile Organic Compound (VOC)" means any compound of carbon, which may be emitted to the
atmosphere during polyester resin operations, except methane, carbon monoxide, carbon dioxide, carbonic acid, metallic
carbides or carbonates, ammonium carbonate, and exempt compounds. For purposes of calculating VOC content of polyester
resin material to determine compliance with this rule, any water or any exempt compounds shall not be considered
to be part of the polyester resin material. VOC content of cleaning materials is expressed in grams of VOC per
liter of material.
- "Waste Material" means any waste material containing VOC including, but not limited to, any
paper or cloth used for cleaning operations, waste resins, and any spent cleaning materials containing VOC.
- Any person operating a polyester resin operation subject to this rule shall:
(i) Use polyester resin material which contains no more than 35 percent by weight of monomer, as applied and as
indicated in the manufacturer's specifications for application, or use a vapor suppressed resin such that the weight
loss from VOC emissions does not exceed 60 grams per square meter of exposed surface area during resin polymerization,
or use a closed mold system. The provisions of this subsection shall not apply to the use of gel coats, corrosion
resistant resins or fire retardant resins; and, (ii) Use gel coats with a monomer content of not more than 45 percent
by weight for pigmented gel coats or 50 percent by weight for clear gel coats, as applied and as indicated in the
manufacturer's specifications for application; and, (iii) Use a corrosion-resistant or fire retardant resin with
a monomer content of no more than 50 percent by weight, as applied and as indicated in the manufacturer's specifications
for application; and, (iv) Use self-closing containers for storing, except during the transfer of resin or solvent,
all polyester resin, VOC containing cleaning materials and solvent-laden rags, including waste materials; and,
(v) Conduct all dry sanding, grinding and cutting operations of polyester resin which contains fiberglass either
inside a controlled enclosure or using a controlled process. For marine vessel repair operations this requirement
shall apply only for sanding, grinding or cutting operations conducted on the exterior of a vessel hull. This requirement
shall not apply to any portable drilling operations; and, (vi) Use a VOC reclamation system for cleaning materials,
(A) the materials contain less than 200 grams of VOC per liter (1.7 lb/gal); or (B) the materials have initial
boiling points greater than 190¡ C (374¡ F); or (C) the combined usage of materials not complying with
(A) or (B) above, is less than 0.5 gallons average per operating day, calculated from monthly records maintained
in accordance with Section (f). The solvent residue from the reclamation system shall not contain more than 20
percent VOC by weight; and,
(vii) Use only airless, air-assisted airless, high-volume low-pressure spray equipment or electrostatic spray equipment
for spray operations except for touch-up and repair operations using a hand held air atomized spray gun which has
a container for the resin as part of the gun; and, (viii) Not use a polyester resin or cleaning material subject
to this rule that, after December 4, 1990, was newly formulated to contain or reformulated to increase the content
of, methylene chloride, trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), trichlorotrifluoroethane
(CFC-113), dichlorotetrafluoroethane (CFC-114) or chloropentafluoroethane (CFC-115).
- A person shall not sell or, offer for sale, a polyester resin or cleaning material subject to this rule that,
after December 4, 1990, was newly formulated to contain or reformulated to increase the content of, methylene chloride,
trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), trichlorotrifluoroethane (CFC-113), dichlorotetrafluoroethane
(CFC-114) or chloropentafluoroethane (CFC-115).
- A person shall not manufacture, sell, offer for sale, or supply any coating or cleaning materials for use in
polyester resin operations unless polyester resin or cleaning material container displays the content of methylene
chloride, trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), trichlorotrifluoroethane (CFC-113),
dichlorotetrafluoroethane (CFC-114), or chloropentafluoroethane (CFC-115).
Any person subject to the requirements of Subsection
s (d)(1) of this rule shall maintain records
of VOC-containing materials in accordance with the following:
a current records of polyester resin materials and gel coats used, which provide
the manufacturer identification, material specifications, monomer content, content of any catalysts, fillers, and/or
diluents, including thinners, and type of each resin (i.e. regular, vapor-suppressed, corrosion-resistant, or fire
retardant) or gel coat (i.e. pigmented or clear). For vapor suppressed resins, also maintain records showing manufacturer's
information on the weight loss during resin polymerization.
- Maintain current records of the manufacturer's identification and VOC content of the cleaning materials used.
- Maintain records on a daily or monthly basis showing the manufacturer's identification and amount of each polyester
resin material and cleaning material used.
- Maintain records of the content of methylene chloride, trichlorofluoromethane (CFC-11), dichlorodifluoromethane
(CFC-12), trichlorotrifluoroethane (CFC-113), dichlorotetrafluoroethane (CFC-114) and chloropentafluoroethane (CFC-115)
contained in any polyester resin material or cleaning material used.
Such records shall be retained on site for at least three years, and shall be made available to the District
(g) TEST METHODS
- Measurement of the monomer content of resins subject to Subsections (d)(1)(i), (d)(1)(ii), or (d)(1)(iii) of
this rule shall be conducted and reported in accordance with SCAQMD Method 312-91 for determination of percent
monomer in polyester resin.
- Measurement of the polyester resin material weight loss per square meter subject to Subsection (d)(1)(i) of
this rule shall be conducted and reported in accordance with SCAQMD Method 309-91 for determination of static volatile
- Measurement of the VOC content of cleaning materials subject to Subsection (d)(1)(vi)(A) of this rule shall
be conducted and reported in accordance with EPA Method 24 (40 CFR 60, Appendix A) as it exists on April 6, 1993.
- Measurement of the initial boiling point of cleaning materials subject to Subsection (d)(1)(vi)(B) of this
rule shall be conducted and reported in accordance with ASTM test method D1078-86 (Distillation Range of Volatile
- Measurement of the VOC content in solvent residue subject to Subsection (d)(1)(vi) of this rule shall be conducted
and reported in accordance with EPA Method 25D as referenced in 56FR 33494.
- Perfluorocarbon compound(s) shall be recognized as exempt compounds pursuant to Subsection (c)(9) only if the
presence of such compounds is claimed by the manufacturer of the material containing the compound, and if the manufacturer
identifies a test method for quantifying the identified compounds which has been approved by the Air Pollution
Control Officer, the Air Resources Board, and the Environmental Protection Agency.