(Adopted: 07/06/79; Amended: 5/07/82; Amended: 01/06/84; 

Amended: 06/01/84; Amended: 01/09/87; Amended: 2/06/87; 

Amended: 04/03/87; Amended 05/05/89; Amended: 03/02/90; 

Amended: 04/06/90; Amended: 06/01/90; Amended: 11/02/90; 

Amended: 12/07/90; Amended: 08/02/91; Amended 03/06/92; 

Amended: 12/04/92; Amended: 12/10/93; Amended: 1/13/95; 

Amended: 12/13/96; Amended: 03/20/07; Amended: 08/20/13) 

AVAQMD Rule 1124 1124-1

Aerospace Assembly and 

Component Manufacturing Operations 

RULE 1124 

Aerospace Assembly and 

Component Manufacturing Operations 

(A) General 

(1) Purpose 

(a) To reduce Volatile Organic Compounds (VOC) emissions from aerospace 

assembly and component manufacturing operations.

(2) Applicability 

(a) This rule applies to any operation associated with manufacturing and 

assembling products for Aircraft and Space Vehicles. The affected 

industries include commercial and military Aircraft, satellite, space shuttle 

and rocket manufacturers and their subcontractors.

(b) This rule also applies to maskant applicators, Aircraft refinishers, Aircraft 

Fastener Manufacturers, Aircraft operators, and Aircraft maintenance and 

service facilities. 

(B) Definitions 

For the purpose of this rule, the following definitions shall apply: 

(1) Ablative Coating – A Coating that chars when exposed to open flame or extreme 

temperatures, as would occur during the failure of an engine casing or during 

aerodynamic heating. The ablative char surface serves as an insulative barrier, 

protecting adjacent components from the heat or open flame.

(2) Adhesion Promoter Coating – A Coating that is used to promote wetting and 

forms a chemical bond with a subsequently applied Sealant or other elastomer. 

(3) Adhesive – Any substance that is used to bond one surface to another surface by 

attachment. 

(4) Adhesive Bonding Primer – A Primer applied in a thin film to Aerospace 

Components for the purpose of corrosion inhibition and increased adhesive bond 

strength by attachment. 
1124-2 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(5) Aerosol Coating Product – A pressurized Coating product containing pigments or 

resins that is dispensed by means of a propellant, and is packaged in a disposable 

can for hand-held application. 

(6) Aerospace Component – The raw material, partial or completed fabricated part, 

assembly of parts, or completed unit of any Aircraft or Space Vehicle and 

includes integral equipment such as models, mock-ups, prototypes, molds, jigs, 

tooling, hardware jackets, and test coupons. 

(7) Aerospace Material – Any Coating, Primer, Adhesive, Sealant, maskant, 

lubricant, Stripper or hand-wipe cleaning or clean-up solvent used during the 

manufacturing, assembly, refinishing, maintenance or service of an Aerospace 

Component. 

(8) Air Brush Operations – Application of Aerospace Material with equipment 

operating at air pressure between 25 psi and 116 psi and an air volume of 0.7 cfm 

and 1.75, respectively.

(9) Aircraft – Any machine designed to travel through the air, without leaving the 

earth's atmosphere, whether heavier or lighter than air, including airplanes, 

balloons, dirigibles, helicopters, and missiles. 

(10) Air Pollution Control Officer (APCO) – The person appointed to the position of 

Air Pollution Control Officer of the District pursuant to the provisions of 

California Health & Safety Code §40750 and his or her designee.

(11) Antichafe Coating – A Coating applied to areas of moving Aerospace 

Components which may rub during normal operation. 

(12) Anti-Wicking Wire Coating – The outer Coating of a wire which prevents fluid 

wicking into insulation of the wire. 

(13) Barrier Coating – A Coating applied in a thin film to Fasteners to inhibit 

dissimilar metal corrosion and to prevent galling. 

(14) Bearing Coating – A Coating applied to an antifriction bearing, a bearing housing, 

or the area adjacent to such bearing in order to facilitate bearing function or to 

protect be material from excessive wear. A material shall not be classified as a 

Bearing Coating if it can also be classified as a Dry Lubricative Material or a 

Solid-Film Lubricant.

(15) Bonding Maskant – A temporary Coating used to protect selected areas of 

aerospace parts from strong acid or alkaline solutions during processing for 

bonding.
AVAQMD Rule 1124 1124-3

Aerospace Assembly and 

Component Manufacturing Operations 

(16) Caulking and Smoothing Compound – Semi-solid materials which are applied by 

Hand Application Methods and are used to aerodynamically smooth exterior 

vehicle surfaces or fill cavities such as bolt hole accesses. A material shall not be 

classified as a Caulking and Smoothing Compound if it can also be classified as a 

Sealant.

(17) Chemical Agent-Resistant Coating (CARC) – An exterior Topcoat designed to 

withstand exposure to chemical warfare agents or the decontaminants used on 

these agents. 

(18) Chemical Milling – The removal of metal by chemical action of acids or alkalis. 

(19) Chemical Milling Maskant – A Coating applied directly to aluminum components 

to protect surface areas when Chemical Milling the component with a Type I or 

Type II Etchant. Type I Chemical Milling Maskants are used with a Type I 

Etchant and Type II Chemical Milling Maskants are used with a Type II Etchant. 

This definition does not include Bonding Maskants, Critical Use and Line Sealant 

Maskants, and Seal Coat Maskants. Additionally, maskants that must be used 

with a combination of Type I or II Etchants and any of the above types of 

maskants (i.e., Bonding, Critical Use and Line Sealer, and Seal Coat) are not 

included. Maskants that are defined as Specialty Coatings are not included in this 

definition. 

(20) Chemical Processing Maskant – A Coating applied directly to an Aerospace 

Component to protect surface areas when anodizing, aging, bonding, plating, 

etching, and/or performing other chemical surface operations on the component. 

(21) Clear Topcoat – A Topcoat that contains no visible pigments and is uniformly 

transparent when applied. 

(22) Coating – A material that is applied to the surface of an aerospace vehicle or 

component to form a decorative, protective, or functional solid film, or the solid 

film itself. 

(23) Coating Application Equipment – Equipment used for applying Coating to a 

substrate. Coating Application Equipment includes Coating distribution lines, 

Coating hoses, pressure-pots, spray guns, and hand-application equipment, such 

as hand-rollers, brushes, daubers, spatulas, and trowels. 

(24) Commercial Exterior Aerodynamic Structure Primer – A Primer used on 

aerodynamic components and structures that protrude from the fuselage, such as 

wings and attached components, control surfaces, horizontal stabilizers, vertical 

fins, wing-to-body fairings, antennae, and landing gear and doors, for the purpose 

of extended corrosion protection and enhanced adhesion. 

(25) Commercial Interior Adhesive – Materials used in the bonding of passenger cabin 

interior components. These components must meet the Federal Aviation 

Administration (FAA) fireworthiness requirements. 
1124-4 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(26) Compatible Substrate Primer – Either compatible epoxy Primer or Adhesive 

Primer. Compatible epoxy Primer is a Primer that is compatible with the filled 

elastomeric Coating and is epoxy based. The Compatible Substrate Primer is an 

epoxypolyamide Primer used to promote adhesion of elastomeric Coatings such 

as Impact-Resistant Coatings. Adhesive Primer is a Coating that (1) inhibits 

corrosion and serves as a Primer applied to bare metal surfaces or prior to 

Adhesive application, or (2), is applied to surfaces that can be expected to contain 

fuel. Fuel-Tank Coatings are excluded from this category. 

(27) Conformal Coating – A Coating applied to electrical conductors and circuit 

boards to protect them against electrical discharge damage and/or corrosion. 

(28) Corrosion Prevention Compound System – A Coating system that provides 

corrosion protection by displacing water and penetrating mating surfaces, forming 

a protective barrier between the metal surface and moisture. Coatings containing 

oils or waxes are excluded from this category. 

(29) Critical Use and Line Sealer Maskant – A temporary Coating, not covered under 

other maskant categories, used to protect selected areas of aerospace parts from 

strong acid or alkaline solutions such as those used in anodizing, plating, 

Chemical Milling and processing of magnesium, titanium, or high-strength steel, 

high-precision aluminum Chemical Milling of deep cuts, and aluminum Chemical 

Milling of complex shapes. Materials used for repairs or to bridge gaps left by 

scribing operations (i.e., line sealer) are also included in this category. 

(30) Cryogenic Flexible Primer – A Primer designed to provide corrosion resistance, 

flexibility, and adhesion of subsequent Coating systems when exposed to loads up 

to and surpassing the yield point of the substrate at cryogenic temperatures 

(-275oF and below). 

(31) Cryoprotective Coating – A Coating that insulates cryogenic or subcooled 

surfaces to limit propellant boil-off, maintain structural integrity of metallic 

structures during ascent or re-entry, and prevent ice formation. 

(32) Cyanoacrylate Adhesive – A fast-setting, single component Adhesive that cures at 

room temperature. Also known as “super glue.” 

(33) District – The Antelope Valley Air Quality Management District, the 

geographical area of which is described in District Rule 103. 

(34) Dry Lubricative Material – Coatings consisting of lauric acid, cetyl alcohol, 

waxes or other non-cross linked or resin bound materials which act as a dry 

lubricant or protective coat. 

(35) Electric- or Radiation-Effect Coatings – Include electrically conductive Coatings 

and Radiation-Effect Coatings and Coating systems the uses of which may 

include prevention of radar detection. 
AVAQMD Rule 1124 1124-5

Aerospace Assembly and 

Component Manufacturing Operations 

(36) Electronic Wire Coating – The outer electrical insulation Coating applied to tape 

insulation of a wire specifically formulated to smooth and fill edges. 

(37) Electrostatic Discharge and Electromagnetic Interference (EMI) Coating – A 

Coating applied to Space-Vehicles, missiles, aircraft radomes, and helicopter 

blades to disperse static energy or reduce electromagnetic interference. 

(38) Elevated-Temperature Skydrol-Resistant Commercial Primer – Primer applied 

primarily to commercial Aircraft (or commercial Aircraft adapted for military 

use) that must withstand immersion in phosphate ester (PE) hydraulic fluid 

(Skydrol 500b or equivalent) at the elevated temperature of 150°F for 1,000 

hours. 

(39) Epoxy Polyamide Topcoat – Coating used where harder films are required or in 

some areas where engraving is accomplished in camouflage colors. 

(40) Exempt Compounds – A compound identified as exempt in 40 CFR 51.100(s). 

(41) Facility – Any permit unit, group of permit units, non-permitted equipment or any 

combination thereof which emits or may emit an Air Pollutant; and belongs to a 

single major industrial group in the Standard Industrial Classification manual; and 

is located on a single parcel of land or on contiguous property within the District; 

and which is owned or operated by the same person or by persons under common 

control. 

(42) Fastener – Any of various devices, including but not limited to, pins, collars, 

blots, nuts, and rivets for holding together two (2) or more objects or parts. 

(43) Fastener Manufacturer – A Facility that coats Aircraft Fasteners, such as pins, 

collars, bolts, nuts, and rivets, with Solid-Film Lubricants for distribution to other 

Facilities. 

(44) Fire-Resistant (Interior) Coating 

(a) For civilian Aircraft, Fire-Resistant Interior Coatings are used on 

passenger cabin interior parts that are subject to FAA fireworthiness 

requirements. 

(b) For military Aircraft, Fire-Resistant Interior Coatings are used on parts 

that are subject to the flammability requirements of MIL-STD-1630A and 

MIL-A-87721. 

(c) For space applications, Fire-Resistant Interior Coatings are used on parts 

that are subject to the flammability requirements of SE-R-0006 and SSP 

30233. 
1124-6 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(45) Flexible Primer – A Primer that meets flexibility requirements such as those 

needed for Adhesive Bond Primed Fastener heads or on surfaces expected to 

contain fuel. The flexible Coating is required because it provides a compatible, 

flexible substrate over bonded sheet rubber and rubber-type Coatings as well as a 

flexible bridge between the Fasteners, skin, and skin-to-skin joints on outer 

Aircraft skins. This flexible bridge allows more Topcoat flexibility around 

Fasteners and decreases the chance of the Topcoat cracking around the Fasteners. 

The result is better corrosion resistance. 

(46) Flight-Test Coating – A Coating applied to an Aircraft prior to flight testing to 

protect the Aircraft from corrosion and to provide required marking during flight 

test evaluation. 

(47) Fuel-Tank Adhesive – An Adhesive used to bond components exposed to fuel that 

must be compatible with Fuel-Tank Coatings.

(48) Fuel-Tank Coating, General – A Coating applied to a fuel tank of an Aircraft to 

protect it from corrosion and/or bacterial growth. 

(49) Fuel-Tank Coating, Rapid Cure – A Fuel-Tank Coating with shortened curing 

times and decreased sensitivity to low humidity during the curing process. 

(50) Hand Application Method – The application of Aerospace Materials by manually 

held, non-mechanically operated equipment. Such equipment includes paint 

brushes, hand rollers, caulking guns, trowels, spatulas, syringe daubers, rags, and 

sponges.

(51) High-Temperature Coating – A Coating that must withstand temperatures of more 

than 350oF. 

(52) High-Volume, Low-Pressure (HVLP) Spray – An Aerospace Materials 

application system which is operated with air pressure of between 0.1 and 10 

pounds per square inch gauge (psig).

(53) Impact-Resistant Coating – A flexible Coating that protects Aerospace 

Components, such as Aircraft landing gear, and landing gear compartments, and 

other surfaces subject to impact and abrasion from runway debris. 

(54) Insulation Covering – Material that is applied to foam insulation to protect the 

insulation from mechanical or environmental damage.

(55) Intermediate Release Coating – A thin Coating applied beneath Topcoats to assist 

in removing the Topcoat in depainting operations and generally to allow the use 

of less hazardous depainting methods. 

(56) Lacquer Coating – A clear or pigmented Coating formulated with a nitrocellulose 

or synthetic resin to dry by evaporation without a chemical reaction. Lacquers are 

resoluble in their original solvent. 
AVAQMD Rule 1124 1124-7

Aerospace Assembly and 

Component Manufacturing Operations 

(57) Low-Solids Adhesive Coating, Primer or Sealant - An Adhesive Coating, Primer 

or Sealant which has less than one pound of solids per gallon of material. Such 

solids are the non-volatiles remaining after a sample is heated at 230oF (110oC) 

for one hour.

(58) Low-Solids Corrosion Resistant Primer – A corrosion resistant polyurethane 

compatible Primer with enhanced adhesion and rain erosion resistance which 

contains no more than 45 percent (45%) solids, by weight, as applied. 

(59) Metallized Epoxy Coating – A Coating that contains relatively large quantities of 

flake pigmentation for appearance and/or added protection. 

(60) Mold Release Coating – A Coating applied to the surface of a mold to prevent the 

molded component from sticking to the mold as it is removed.

(61) Non-Structural Adhesive – An Adhesive that bonds non-load-carrying Aircraft 

components in non-critical applications and is not covered in any other specialty 

Adhesive categories.

(62) Optical Anti-Reflection Coating – A Coating with a low reflectance in the 

infrared and visible wavelength range and is used for anti-reflection on or near 

optical and laser hardware. 

(63) Part Marking Coating – Coatings or inks used to make identifying markings on 

materials, components, and/or assemblies. These markings may be either 

permanent or temporary. 

(64) Phosphate Ester Resistant Ink – A Coating that is used for surface identification 

or marking which inhibits phosphate ester fluid corrosion. 

(65) Photolithographic Maskant – A Coating applied by Photoresist Operation(s) 

directly to printed circuit boards, and ceramic and similar substrates to protect 

surface areas from Chemical Milling or Chemical Processing. 

(66) Photoresist Operation – A process for the application or development of 

photoresist masking solution on a substrate, including preparation, soft bake, 

develop, hard bake, and stripping, and can be generally subdivided as follows: 

(a) Negative Photoresist Operation is a process where the maskant hardens 

when exposed to light and the unhardened maskant is stripped, exposing 

the substrate surface for Chemical Milling or Chemical Processing. 

(b) Positive Photoresist Operation is a process where the maskant softens 

when exposed to light and the softened maskant is stripped, exposing the 

substrate surface for Chemical Milling or Chemical Processing. 
1124-8 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(67) Pre-Bonding Etchant – An acid or basic substance that is used to increase the 

strength of an adhesive bond by chemically altering the substrate surface 

morphology to increase the bonding surface area of aerospace wire Coatings to 

the underlying insulation layer.

(68) Pretreatment Coating – A Coating which contains no more than 12 percent (12%) 

solids, by weight and at least 0.5 percent (0.5%) acid by weight, to provide 

surface etching and is applied directly to metal surfaces to provide corrosion 

resistance, adhesion, and ease of stripping.

(69) Primer – A Coating applied directly to an Aerospace Component for purposes of 

corrosion prevention, protection from the environment, functional fluid resistance 

and/or adhesion of subsequent Coatings, Adhesives, or Sealants. 

(70) Primer Compatible with Rain Erosion-Resistant Coating – A Primer to which 

Rain Erosion-Resistant Coating is applied. 

(71) Rain Erosion-Resistant Coating – A Coating that protects leading edges, flaps, 

stabilizers, and engine inlet lips against erosion caused by rain impact during 

flight. 

(72) Repair Coating – A Coating used to recoat portions of a product which has 

sustained mechanical damage to the Coating following normal painting 

operations. 

(73) Rework – The inspection, repair, and reconditioning of Aerospace Components 

subject to this rule. 

(74) Rocket Motor Bonding Adhesive – Adhesive used in rocket motor bonding 

applications. 

(75) Rocket Motor Nozzle Coating – A catalyzed epoxy Coating system used in 

elevated temperature applications on rocket motor nozzles. 

(76) Rollable, Brushable or Extrudable Sealant – A single or multi-component 

polymeric material used to seal many types of joints, gaps, removable panels, and 

windows where moderate movement is expected. Such material may be applied 

by rolling brushing extruding or daubing. 

(77) Rubber-Based Adhesive – A quick setting contact cement that provides a strong, 

yet flexible bond between two mating surfaces that may be of dissimilar 

materials. 

(78) Scale Inhibitor Coating – A Coating that is applied to the surface of a part prior to 

thermal processing to inhibit the formation of tenacious scale. 

(79) Screen Print Ink – An ink used in screen printing processes during fabrication of 

decorative laminates and decals. 
AVAQMD Rule 1124 1124-9

Aerospace Assembly and 

Component Manufacturing Operations 

(80) Sealant – Viscous semisolid materials that fill voids in order to seal out water, 

fuel, and other liquids and solids, and in some cases, air movement. 

(81) Seal Coat Maskant – An overcoat applied over a maskant to improve abrasion and 

chemical resistance during production operations. 

(82) Silicone Insulation Material – An insulating material applied to exterior metal 

surfaces for protection from high temperatures caused by atmospheric friction or 

engine exhaust. These materials differ from Ablative Coatings in that they are not 

“sacrificial.”

(83) Solid-Film Lubricant – A very thin Coating consisting of a binder system 

containing as its chief pigment material one or more of the following: 

molybdenum disulfide, graphite, polytetrafluoroethylene (PTFE), or other solids 

that act as a dry lubricant between faying surfaces. 

(84) South Coast Air Quality Management District (SCAQMD) – The air quality 

district created pursuant to Division 26, Part 3, Chapter 5.5 of the California 

Health & Safety Code (commencing with §40400). 

(85) Space Vehicle – A vehicle designed to travel beyond the earth's atmosphere. 

(86) Specialized Function Coating – A Coating that fulfills extremely specific 

engineering requirements that are limited in application and are characterized by 

low volume usage. This category excludes Coatings covered in other Specialty 

Coating categories. 

(87) Specialty Coating – A Coating that, even though it meets the definition of a 

Primer, Topcoat, or self-priming Topcoat, has additional performance criteria 

beyond those of Primers, Topcoats, and self-priming Topcoats for specific 

applications. These performance criteria may include, but are not limited to, 

temperature or fire resistance, substrate compatibility, antireflection, temporary 

protection or marking, sealing, adhesively joining substrates, or enhanced 

corrosion protection. 

(88) Stencil Coating – An ink or Coating that is rolled, sprayed with an airbrush or 

touch-up gun, or brushed while using a template to add identifying letters and or 

numbers to Aerospace Components.

(89) Stripper – A volatile liquid applied to remove cured Aerospace Material or their 

residues.

(90) Structural Adhesive – Autoclavable – An Adhesive used to bond load-carrying 

Aircraft components and is cured by heat and pressure in an autoclave. 

(91) Structural Adhesive, High Temperature – Autoclavable – An Adhesive used to 

bond load-carrying Aircraft Components which is cured by heat and pressure in 

an autoclave, and can withstand service temperatures above 450° F (232° C). 
1124-10 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(92) Structural Adhesive – Non-Autoclavable – An Adhesive cured under ambient 

conditions and is used to bond load-carrying Aircraft components or other critical 

functions, such as nonstructural bonding in the proximity of engines. 

(93) Temporary Protective Coating – A Coating applied to an Aerospace Component 

to protect it from mechanical and environmental damage during manufacturing. 

(94) Thermal Control Coating – A Coating formulated with specific thermal 

conductive or radiative properties to permit temperature control of the substrate. 

(95) Topcoat – A Coating applied over a Primer or other Coating on an aerospace 

vehicle or component for purposes such as appearance, identification, 

camouflage, or protection. Topcoats that are defined as Specialty Coatings are 

not included in this definition.

(96) Touch-Up Operation – The application of Aerospace Materials by brush, air 

brush, detail HVLP spray equipment outside of a permitted paint enclosure to 

repair minor surface damage and imperfections after the main Coating process.

(97) Transfer Efficiency – The ratio of the weight or volume of Coating solids 

adhering to an object to the total weight or volume, respectively, of Coating solids 

used in the application process, expressed as a percentage. 

(98) Type I Etchant – A Chemical Milling etchant that contains varying amounts of 

dissolved sulfur and does not contain amines. 

(99) Type II Etchant – A Chemical Milling etchant that is a strong sodium hydroxide 

solution containing amines. 

(100) Unicoat – A Coating which is applied directly to an Aerospace Component for 

purposes of corrosion protection, environmental protection, and functional fluid 

resistance that is not subsequently Topcoated. 

(101) United States Environmental Protection Agency (USEPA) – The United States 

Environmental Protection Agency, the Administrator of the USEPA and his or her 

authorized representative. 

(102) Volatile Organic Compound (VOC) – Any volatile compound containing the 

element carbon, excluding methane, carbon monoxide, carbon dioxide, carbonic 

acid, metallic carbides or carbonates, ammonium carbonate, and Exempt 

Compounds as listed in 40 CFR 51.100(s).

(103) Wet Fastener Installation Coating – A Primer or Sealant applied by dipping, 

brushing, or daubing to Fasteners that are installed before the Coating is cured. 

(104) Wing Coating – A corrosion-resistant Coating that is resilient enough to withstand 

the flexing of the wings. 
AVAQMD Rule 1124 1124-11

Aerospace Assembly and 

Component Manufacturing Operations 

(C) Requirements 

(1) VOC Content of Coatings 

(a) A person shall not apply to Aerospace Components any Aerospace 

Materials, including any VOC-containing materials added to the original 

Aerospace Materials supplied by the manufacturer, which contain VOC in 

excess of the limits specified below: 

SPECIALTY COATING VOC LIMITS 

Grams Per Liter of Coating Less Water and Less Exempt Compounds 

AEROSPACE MATERIALS VOC Limit 

 

PRIMERS -- 

General 350 

Adhesive Bonding Primers -- 

 Commercial Aircraft 250 

 Military Aircraft 805 

Commercial Exterior Aerodynamic Structure Primer 650 

Compatible Substrate Primer 780 

Cryogenic Flexible Primer 645 

Elevated-Temperature Skydrol-Resistant Commercial Primer 740 

Flexible Primer 640 

Low-Solids Corrosion Resistant Primer 350 

Primer Compatible with Rain Erosion-Resistant Coating 850 

 

COATINGS -- 

Ablative Coating 600 

Adhesion Promoter Coating 850 

Antichafe Coating 420 

Bearing Coating 620 

Chemical Agent-Resistant Coating 550 

Conformal Coating 750 

Cryoprotective Coating 600 

Electric- or Radiation-Effect Coating 800 

Electrostatic Discharge and Electromagnetic Interference (EMI) Coating 800 

Fire-Resistant (Interior) Coating -- 

 Civilian 650 

 Military 800 

 Space 800 

Flight-Test Coating -- 

 Used on Missiles or Single Use Aircraft 420 

 All Other 840 

Fuel-Tank Coating -- 

 General 420 

 Rapid Cure 720 
1124-12 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

High-Temperature Coating 850 

Impact-Resistant Coating 420 

Intermediate Release Coating 750 

Lacquer Coating 830 

Metallized Epoxy Coating 700 

Mold Release Coatings 780 

Optical Anti-Reflection Coating 700 

Part Marking Coating 850 

Pretreatment Coating 780 

Rain Erosion-Resistant Coating 800 

Rocket Motor Nozzle Coating 660 

Scale Inhibitor Coating 880 

Space-Vehicle Coatings, Other: does not include Electric Discharge and 

EMI Protection Coating or Fire-Resistant (Interior) Coating 1000 

Specialized Function Coating 890 

Temporary Protective Coating 250 

Thermal Control Coating 800 

Topcoat -- 

 Clear 520 

 Epoxy Polyamide 660 

 Other 420 

Unicoat Coating 420 

Wet Fastener Installation Coating 675 

Wing Coating 750 

Wire Coatings 

 Electronic Wire Coating 420 

 Anti-Wicking 420 

 Pre-Bonding Etchant 420 

 Phosphate Ester Resistant Ink 925 

 

ADHESIVES -- 

Commercial Interior Adhesive 760 

Cyanoacrylate Adhesive 1020 

Fuel-Tank Adhesive 620 

Non-Structural Adhesive 250 

Rocket Motor Bonding Adhesive 890 

Rubber-Based Adhesive 850 

Space Vehicle Adhesive 800 

Structural Adhesive -- 

 Autoclavable 50 

 High Temperature - Autoclavable 650 

 Non-Autoclavable 850 

 

SEALANTS -- 

Rollable, Brushable or Extrudable Sealant 280 

Fastener Sealant 675 
AVAQMD Rule 1124 1124-13

Aerospace Assembly and 

Component Manufacturing Operations 

Other 600 

 

MASKANTS -- 

Bonding Maskant 1230 

Critical Use and Line Sealer Maskant 750 

Chemical Milling Maskant 

 For use with Type I Etchant 250 

 For use with Type II Etchant 160 

 For Chemical Processing *Less water, Exempt Compounds and 

perchloroethylene (PERC) 250* 

Photolithographic Maskant 850 

Seal Coat Maskant 1230 

 

LUBRICANTS -- 

Fastener Installation Lubricant (applied at time of Aircraft/component 

assembly) -- 

 Solid-Film Lubricant 880 

 Dry Lubricative Material 675 

Fastener Lubricative Coating (applied at time of Fastener Manufacture) -- 

 Solid-Film Lubricant 250 

 Dry Lubricative Material 120 

 Barrier Coating 420 

Non-Fastener Lubricative Coatings (applied at time of non-Fastener 

Manufacture) -- 

 Solid-Film Lubricant 880 

 Dry Lubricative Materials 675 

 

OTHER -- 

Caulking and Smoothing Compound 850 

Corrosion Prevention Compound System 710 

Insulation Covering 740 

Screen Print Ink 840 

Silicone Insulation Material 850 

(b) Documents shall be provided to the APCO demonstrating that the Unicoat 

is being used in lieu of the application of a Primer and Topcoat, and the 

applicant must receive written approval for the use of the Unicoat 

specifying the conditions of application from the APCO. 

(c) For Low-Solids Adhesives, Coatings, Primers or Sealants, the appropriate 

limits in subparagraph (C)(1)(a) shall be expressed in grams of VOC per 

liter of material. 

(2) Solvent Use, Clean Up, and Stripping 

(a) A person shall not use VOC-containing materials for cleaning or clean up, 

excluding Coating stripping and equipment cleaning unless: 
1124-14 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(i) The VOC composite partial pressure is 45 mm Hg or less at a 

temperature of 20°C (68°F); or 

(ii) The material contains 200 grams or less of VOC per liter of 

material. 

(b) A person shall not use Stripper on Aerospace Components unless: 

(i) It contains less than 300 grams of VOC per liter of material; or 

(ii) The VOC composite partial pressure is 9.5 mm Hg (0.18 psia) or 

less at 20°C (68°F). 

(c) A person shall not atomize any solvent into open air. 

(3) Equipment Cleaning Operations 

Cleaning of Coating Application Equipment shall comply with provisions of Rule 

1171 – Solvent Cleaning Operations. 

(4) Storage of VOC-Containing Materials 

All VOC containing material, used or unused, including but not limited to surface 

Coatings, thinners, cleanup solvents, or surface preparation materials, and all 

solvent laden cloth and paper, shall be stored in non-absorbent, non-leaking 

containers which shall be kept closed at all times except during extraction or 

introduction of material for mixing, use or storage. 

(5) Transfer Efficiency 

No person or Facility shall apply Aerospace Material unless it is applied with 

properly operating equipment or controlled, according to operating procedure 

specified by the equipment manufacturer or the APCO, and by the use of one of 

the following methods: 

(a) Electrostatic application; 

(b) Flow coater; 

(c) Roll coater; 

(d) Dip coater; 

(e) High-Volume, Low-Pressure (HVLP) Spray; 

(f) Hand Application Methods; 

(g) Such other alternative application methods as are demonstrated to the 

APCO, using District-approved procedures, to be capable of achieving at 

least an equivalent Transfer Efficiency to method (C)(5)(e) and for which 

written approval of the APCO has been obtained; or 
AVAQMD Rule 1124 1124-15

Aerospace Assembly and 

Component Manufacturing Operations 

(h) Approved air pollution control equipment under paragraph (C)(6). 

(6) Control Equipment 

Owners and/or operators may comply with provisions of paragraphs (C)(1), 

(C)(2), and (C)(5) by using approved air pollution control equipment provided that 

the VOC emissions from such operations and/or materials are reduced in 

accordance with provisions of (a) and (b) below. 

(a) The control device shall reduce emissions from an emission collection 

system by at least 95 percent (95%), by weight, or by reducing the output 

of the air pollution control device to less than 50 ppm calculated for 

carbon with no dilution. 

(b) The owner/operator demonstrates that the system collects at least 90 

percent (90%), by weight, of the emissions generated by the sources of 

emissions. 

(7) Prohibition of Solicitation of Violations 

(a) A person shall not solicit or require any other person to use, in the District, 

any Aerospace Material or combination of Aerospace Materials to be 

applied to any Aircraft Component subject to the provisions of this rule 

that does not meet the limits and requirements of this rule, or of an 

Alternative Emission Control Plan (AECP) approved pursuant to the 

provisions of (C)(8). 

(b) The requirements of this paragraph shall apply to all written or oral 

agreements executed or entered into after April 3, 1987.

(8) Alternative Emission Control Plans 

(a) An owner/operator may comply with the provisions of paragraph (C)(1) 

by means of an Alternative Emission Control Plan pursuant to Rule 108 – 

Alternative Emission Control Plans. 

(D) Recordkeeping and Reporting Requirements 

(1) Recordkeeping 

(a) Records shall be maintained pursuant to the requirements of Rule 109 – 

Recordkeeping for Volatile Organic Compound Emissions. 

(2) Reporting 

(a) Persons who perform qualification acceptance testing on Aerospace 

Materials with a future compliance date for use in the District shall, on 

January 1 and July 1 of each year, submit a status report describing the 
1124-16 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

progress toward the development of Aerospace Materials which satisfy 

future compliance dates. These reports shall contain, at a minimum:

(i) Manufacturer, product number, VOC content, and applicable 

Coating category for each of the test candidates; 

(ii) Test expenditures for the period; 

(iii) Progress on candidates tested during this period; 

(iv) Approvals received for Coatings which comply with future 

compliance dates; and, 

(v) Volume of Coatings used in each Coating category for which there 

is a future compliance date. 

(b) Facilities testing Coatings in the same Coating category may submit joint 

status reports. Once compliance with future compliance dates is achieved 

and a status report is submitted documenting such, no further status reports 

need be submitted. 

(E) Compliance Procedures and Test Methods 

(1) Calculations 

(a) For the purpose of determining compliance with VOC content limits 

specified in section (C), grams of VOC per liter of Aerospace Material 

shall be determined by using the following formulas as applicable: 

(i) For Aerospace Materials not containing reactive diluents, grams of 

VOC per liter of Coating, less water and less Exempt Compounds 

shall be determined as follows: 

  ⁄ =

	
 − 	 − 	



 −  − 



Where: 

⁄ = Grams of VOC per liter of Coating, less water and

less Exempt Compounds. 

Ws = Weight of volatile compounds, in grams. 

Ww = Weight of water, in grams. 

Wes = Weight of Exempt Compounds, in grams. 

Vm = Volume of material, in liters. 

Vw = Volume of water, in liters. 

Ves = Volume of Exempt Compounds, in liters. 

(ii) For Aerospace Materials that contain reactive diluents, grams of 

VOC per liter of coating, less water and less Exempt Compounds 

shall be determined as follows: 
AVAQMD Rule 1124 1124-17

Aerospace Assembly and 

Component Manufacturing Operations 

  ⁄ =

	
 − 	 − 	



 −  − 



Where: 

⁄ = Grams of VOC per liter of Coating, less Water and

less Exempt Compounds. 

Ws = Weight of volatile compounds evolved during 

curing and analysis, in grams. 

Ww = Weight of water evolved during curing and 

analysis, in grams. 

Wes = Weight of Exempt Compounds evolved during 

curing and analysis, in grams. 

Vm = Volume of material prior to reaction, in liters. 

Vw = Volume of water evolved during curing and 

analysis, in liters. 

Ves = Volume of Exempt Compounds evolved during 

curing and analysis, in liters. 

(b) Total grams of VOC per liter of Aerospace Material shall be determined 

using the following formula: 

  ⁄ =

	
 − 	 − 	





Where: 

⁄ = Grams of VOC per liter of Coating 

Ws = Weight of volatile compounds, in grams. 

Ww = Weight of water, in grams. 

Wes = Weight of Exempt Compounds, in grams.

Vm = Volume of material, in liters. 

(c) The VOC composite partial pressure shall be determined as follows: 

 = 

	

	

× 

	

	

+

	


	


+ ∑

	

	









Where: 

Wi = Weight of the “i”th VOC compound, in grams. 

Ww = Weight of water, in grams. 

We = Weight of Exempt Compound, in grams. 

MWi = Molecular weight of the “i”th VOC compound, in 

grams per gram-mole. 

MWe = Molecular weight of Exempt Compound, in grams 

per gram-mole. 

PPc = VOC composite partial pressure at 20°C, in mm Hg. 

VPi = Vapor pressure of the “i”th VOC compound at 20°C, 
1124-18 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

in mm Hg. 

(2) VOC Content of Aerospace Materials 

(a) To determine the physical properties of an Aerospace Material in order to 

perform the calculations in subsection (E)(1), the following reference 

methods shall be used: 

(i) EPA Reference Method 24 (Determination of Volatile Matter 

Content, Water Content, Density Volume Solids, and Weight 

Solids of Surface Coatings, Code of Federal Regulations Title 40, 

Part 60, Appendix A). 

a. Analysis done according to EPA Method 24 shall utilize 

ASTM Method D-2369-95 (Standard Test Method for 

Volatile Content of Coatings), referenced in EPA Method 

24.

b. The exempt solvent content shall be determined using 

SCAQMD Test Methods 302-91 (Distillation of Solvents 

from Paints, Coatings and Inks, February 1993) and 303-91 

(Determination of Exempt Compounds, August 1996) 

(SCAQMD “Laboratory Methods of Analysis for 

Enforcement Samples” manual) or; 

(ii) SCAQMD Test Methods 302, 303, and 304 (SCAQMD 

“Laboratory Methods of Analysis for Enforcement Samples” 

manual). 

(b) The following classes of compounds listed below will be analyzed as 

Exempt Compounds for compliance with subdivision (C), only at such 

time as manufacturers specify which individual compounds are used in the 

Coating formulations and identify the test methods, which, prior to such 

analysis, have been approved by the USEPA and the SCAQMD, that can 

be used to quantify the amounts of each Exempt Compound. 

(i) Cyclic, branched, or linear, completely fluorinated alkanes; cyclic, 

branched, or linear, completely fluorinated ethers with no 

unsaturations; cyclic, branched, or linear, completely fluorinated 

tertiary amines with no unsaturations; and sulfur-containing 

perfluorocarbons with no unsaturations and with sulfur bonds only 

to carbon and fluorine.

(3) Test Methods 

(a) Efficiency of the control device shall be determined according to EPA 

Method 25, 25A, or SCAQMD Test Method 25.1 (Total Gaseous NonMethane Emissions, February 1991) or SCAQMD Test Method 25.3 

(Clean-Fueled Combustion Sources, March 2000). Emissions determined 

to exceed any limits established by this rule through the use of either of 

the above-referenced test methods shall constitute a violation of this rule. 
AVAQMD Rule 1124 1124-19

Aerospace Assembly and 

Component Manufacturing Operations 

(b) The capture efficiency of the emissions collection system shall be 

determined by the USEPA method 204A-F and the most recent version of 

USEPA’s Guidelines for Determining Capture Efficiency or any other 

method approved by the USEPA, the California Air Resources Board, and 

the SCAQMD. 

(c) The Transfer Efficiency of alternative Coating application methods shall 

be determined in accordance with the SCAQMD method “Spray 

Equipment Transfer Efficiency Test Procedure for Equipment User, May 

24, 1989.” 

(d) The identity and quantity of components in solvents shall be determined in 

accordance with SCAQMD test method 308-91 (Quantitation of 

Compounds by Gas Chromatography, February 1993) contained in the 

SCAQMD “Laboratory Methods of Analysis for Enforcement Samples” 

manual. The VOC composite partial pressure is calculated using the 

equation in paragraph (E)(1)(c). 

(e) Multiple Test Methods 

(i) When more than one test method or set of test methods are 

specified for any testing, a violation of any requirement of this rule 

established by any one of the specified test methods or set of test 

methods shall constitute a violation of the rule. 

(f) Any applicable alternative test method may be used so long as such 

method has been approved by USEPA, CARB and the APCO. 

(F) Administrative Requirements 

(1) Rule 442 Applicability 

(a) Any Aerospace Material or Facility which is exempt from all or a portion 

of this rule, shall comply with the provisions of Rule 442 – Usage of 

Solvents. 

(G) Exemptions 

(1) The provisions of paragraph (C)(1) of this rule shall not apply to Aerospace 

Materials with separate formulations that are used in volumes of less than 20 

gallons per year provided that the total of all such formulations applied annually 

at a Facility is less than 200 gallons. 

(2) The provisions of subdivision (C) of this rule shall not apply to a Facility which 

uses a total of less than three (3) gallons of VOC-containing Aerospace Materials 

on each and every day of operation. 
1124-20 AVAQMD Rule 1124

Aerospace Assembly and 

Component Manufacturing Operations 

(3) The provisions of paragraphs (C)(1) and (C)(5) of this rule shall not apply to 

incidental corrosion maintenance Repair Coating operations at military Facilities, 

provided that the Coating use at any maintenance repair location within the 

Facility does not exceed 1.5 gallons per day, and the total Coating usage for such 

operations at the Facility does not exceed five (5) gallons per day. 

(4) The provisions of subparagraph (C)(2)(a) shall not apply to Space Vehicle 

manufacturing. 

(5) The provisions of paragraph (C)(1) shall not apply to clear or translucent Coatings 

applied on clear or transparent substrates. 

(6) The provisions of paragraph (C)(5) shall not apply to Touch-up Operations and 

Stencil Coatings provided that the Touch-up Operations and Stencil Coatings do 

not exceed 25 sq. ft. per Aircraft.

(7) The provisions of paragraph (C)(1) shall not apply to the recoating of assembled 

Aircraft at Rework facilities if original Coating formulations are used. 

(8) The provisions of paragraph (C)(1) shall not apply to Adhesives with separate 

formulations that are used in volumes of less than ten (10) gallons per year. 

(9) The provisions of subdivision (C) shall not apply to laboratories which apply 

Aerospace Materials to test specimens for purposes of research, development, 

quality control, and testing for production-related operations. 

(10) The provisions of paragraph (C)(2) of this rule do not apply to the surface 

cleaning of solar cells, fluid systems, avionic equipment, and laser optics. 

(11) The provisions of subdivision (D)(1) and (C)(5) shall not be applied to the 

application of materials that contain less than 20 grams per liter of VOC per liter 

of material.

(12) The provisions of paragraph (C)(5) shall not apply to the use of materials 

dispensed from airbrush operations provided that the paint reservoir on the air 

brush is eight (8) ounces or less and that the total amount of Coating used for Air 

Brush Operations at the Facility does not exceed five (5) gallons per year. 

(13) The provisions of this rule shall not apply to Aerosol Coating Products. 

See SIP Table at http://www.avaqmd.ca.gov/Modules/ShowDocument.aspx?documentid=921