RULE 4605 AEROSPACE ASSEMBLY AND COMPONENT COATING OPERATIONS

(Adopted December 19, 1991; Amended May 21, 1992; A mended December 17, 1992; Amended March 31, 1993; Amended February 17, 1994; Amended December 19, 1996; Amended December 20, 2001; Amend ed September 20, 2007; Amended June 16, 2011)

1.0 Purpose

The purpose of this rule is to limit the emissions of volatile organic compounds (VOCs) from aerospace coatings and adhesives, from the org anic solvent cleaning, and the storage and disposal of solvents and waste solvent materials associated with the use of aerospace coatings and adhesives and to provide the administrative requirements for recording and measuring the emissions.

2.0 Applicability

This rule shall apply to the manufacturing, assembl ing, coating, masking, bonding, paint stripping, surface cleaning, service, and maintenan ce of aerospace components, the cleanup of equipment, and the storage and disposal of solvents and waste solvent materials associated with these operations.

3.0 Definitions

3.1 Ablative Coating: a coating that chars when exp osed to open flame or extreme temperatures, as would occur during the failure of an engine casing or during aerodynamic heating. The ablative char surface serv es as an insulative barrier, protecting adjacent components from the heat or ope n flame.

3.2 Adhesion Promoter: a coating applied to a subs trate in a monomolecular thickness to promote wetting and form a chemical bond with th e subsequently applied

material.

3.3 Adhesive: a substance that is used to bond one surface to another.

3.4 Adhesive Bonding Primer: a coating applied in a very thin film to aerospace adhesive bond detail components for corrosion inhib ition and adhesion.

3.5 Aerosol Coating: a mixture of pigments, resins , and liquid and gaseous solvents and propellants packaged in a disposable container for hand-held application.

3.6 Aerospace Component: any raw material, partial or completed fabricated part, assembly of parts, or completed unit of any aircraf t, helicopter, missile, or space vehicle, including mockups and prototypes. 

   

3.7 Aerospace Material: any coating, primer, adhes ive, sealant, maskant, lubricant, stripper or hand-wipe cleaning or clean-up solvent used during the manufacturing, assembly, refinishing, maintenance o r service of an aerospace
component.

3.8 Antichafe Coating: a coating applied to areas of moving aerospace components which may rub during normal operation.

3.9 Anti-wicking Wire Coating: the outer coating o f a wire which prevents fluid wicking into the insulation of the wire.

3.10 APCO: as defined in Rule 1020 (Definitions).

3.11 ARB: California Air Resources Board.

3.12 ASTM: American Society for Testing and Materi als.

3.13 Barrier Coating: a coating applied in a thin film to fasteners to inhibit dissimilar metal corrosion and to prevent galling.

3.14 Bearing Coating: a coating applied to an antif riction bearing, a bearing housing, or the area adjacent to such a bearing in order to fac ilitate bearing function or to protect the base material from excessive wear. A ma terial shall not be classified as a bearing coating if it can also be classified as a dry lubricative material or a solid

film lubricant.

3.15 Brush Coating: manual application of coatings using brushes and rollers.

3.16 Caulking and Smoothing Compounds: a semi-solid materials which are applied by hand application methods and are used to aerodynami cally smooth exterior vehicle

surfaces or fill cavities such as bolt hole accesse s. A material shall not be classified as a caulking and smoothing compound if it can also be classified as a

sealant.

3.17 Chemical Agent-resistant Coating (CARC): an ex terior topcoat designed to withstand exposure to chemical warfare agents or th e decontaminants used on these
agents.

3.18 Chemical Milling: the removal of metal by che mical action of acids or alkalis.

3.19 Clear Topcoat: a clear or semi-transparent co ating applied over a primer for purposes such as appearance, identification, or pro tection. 

   

3.20 Coating: a material applied onto or impregnat ed into a substrate for protective, decorative, or functional purposes. Such materials include, but are not limited to, paints, varnishes, sealers, and stains.

3.21 Commercial Exterior Aerodynamic Structure Prim er: a primer utilized for the purpose of extended corrosion protection, which is only used on the exterior of passenger and cargo doors, supporting door structur es, aerodynamic components, and structures of commercial aircraft which protrud e from the fuselage, such as wings and attached components, control surfaces, ho rizontal stabilizer, vertical fins, wing-to-body fairings, antennae, landing gear and landing gear doors.

3.22 Conformal Coating: a coating applied to elect rical conductors and circuit boards to protect them against electrical discharge damage and/or corrosion.

3.23 Composite Partial Pressure: the sum of the pa rtial pressures of the VOC compounds in a solvent. The VOC composite partial pressure is calculated as

follows:



# ∑ ∑

∑

= = =



### + + =
k

1 n

1 i i

i

e e

w w n

1

i i i

i

c



### MW W

MW W

MW W MW )

)(VP (W

PP

e

Where:

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

W w = Weight of water, in grams

W e = Weight of exempt compound, in grams

MW i = Molecular weight of the “i”th VOC compound, in grams per gram-mole

MW w = Molecular weight of water, in grams per gram-mol e MW e = Molecular weight of the “e”th exempt compound, in grams per gram-mole

PP c = VOC composite partial pressure at 20 o C (68 o F), in mm Hg

VP i = Vapor pressure of the “i”th VOC compound at 20 o C (68 o F), in mm Hg

3.24 Decorative Laminate Primer: an adhesive bondi ng primer which is applied to a

substrate to enhance adhesion between the decorativ e laminate and the subsequently applied substrate, and is cured at a m aximum temperature of 250°F.

3.25 Dip Coating: the process in which a substrate is immersed in a solution (or dispersion) containing the coating and then withdra wn. 

  
 

3.26 Dry Lubricative Coating: a coating 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.

3.27 Electric-effect Coating: an electrically-cond uctive coating.

3.28 Electrodeposition: a dip coating application method where the paint solids are given an electrical charge which is then attracted to a substrate.

3.29 Electromagnetic Interference (EMI) Coating: a coating applied to space vehicles, missiles, aircraft radomes, and helicopter blades t o disperse static energy or reduce electromagnetic interference.

3.30 Electronic Wire Coating: the outer electrical insulation coating applied to tape insulation of a wire specifically formulated to smo oth and fill edges.

3.31 Electrostatic Application: a sufficient charg ing or atomized paint droplets to cause deposition principally by electrostatic attraction. This application shall be operated at a minimum 60 KV power.

3.32 EPA: United States Environmental Protection A gency.

3.33 Epoxy Based Fuel Tank Coating: a coating whic h contains epoxy resin that is applied to integral fuel tank components of aircraf t to protect the fuel tank from corrosion and the by-products of bacterial growth.

3.34 Fastener Sealant: a sealant applied to a devi ce used to join two or more parts together.

3.35 Fire Resistant Coating - Civilian (interior): a cabin interior coating that passes Federal Aviation Administration standards using the Ohio State University Heat Release, Fire and Burn Tests.

3.36 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.

3.37 Flow Coating: a coating application system wi th no air supplied to the nozzle and where paint flows over the part and the excess coat ing drains back into a collection
system.

3.38 Fuel Tank Adhesive: an adhesive used to bond components continuously exposed to fuel and which must be compatible with and used with fuel tank coatings. 

  
 

3.39 Fuel Tank Coating: a coating applied to the i nterior of a fuel tank or areas of an aircraft that are continuously wetted by fuel to pr otect it from corrosion and/or bacterial growth.

3.40 Grams of VOC per Liter of Coating, Less Water and Exempt Compounds: the weight of VOC content per combined volume of VOC an d coating solids and can be calculated by the following equation:

Grams of VOC per liter of coating, less water and = Ws - Ww - Wec exempt compounds Vm - Vw - Vec

Where, Ws = weight of volatile compounds (grams) Ww = weight of water (grams) Wec = weight of exempt compounds (grams) Vm = volume of material (liters) Vw = volume of water (liters) Vec = volume of exempt compounds (liters)

3.41 Grams of VOC per Liter of Material: the weight of VOC per volume of material and can be calculated by the following equation:

Grams of VOC per liter of material = Ws - Ww - Wec

Vm Where, Ws = weight of volatile compounds (grams) Ww = weight of water (grams) Wec = weight of exempt compounds (grams) Vm = volume of material (liters)

3.42 Hand Application Methods: the application of coatings, sealants, or adhesives, by non-mechanical hand-held equipment including but no t limited to paint brushes, hand rollers, caulking guns, trowels, spatulas, syr inge daubers, rags and sponges.

3.43 High Temperature Coating: a coating that is c ertified to withstand temperatures of

more than 350 ° F.

3.44 High-Volume, Low-Pressure (HVLP) Spray Equipme nt: equipment used to apply materials by means of a spray gun which is designed and intended to be operated, and which is operated, between 0.1 and 10.0 psig of air atomizing pressure measured dynamically at the center of the air cap a nd at the air horns, measured dynamically at the center of the air cap and the ai r horns. 

   

3.45 Impact Resistant Coating: a flexible coating that protects aerospace components, such as aircraft landing gear, and landing gear com partments, and other surfaces subject to abrasive impacts from runway debris.

3.46 Intermediate Release Coating: a thin coating a pplied beneath topcoats to assist in removing the topcoat in depainting operations and g enerally to allow the use of less hazardous depainting methods.

3.47 Lacquer: a clear or pigmented coating formulat ed with a nitrocellulose or synthetic resin to dry by evaporation without a chemical reac tion. Lacquers are resoluble in their original solvent.

3.48 Liquid Leak: a visible solvent leak from a co ntainer at a rate of more than three drops per minute, or a visible liquid mist.

3.49 Long Term Adhesive Bonding Primer (Metal to St ructural Core Bonding): an adhesive bonding primer that has met the aircraft m anufacturers’ required performance characteristics following 6000 hours te sting, used for metal to structural core bonding, and with an adhesive that is specified to be cured at

350 o F ± 10 ° F.

3.50 Maskant for Chemical Milling: a coating appli ed directly to an aerospace component to protect surface areas when chemical mi lling such component.

3.51 Metalizing Epoxy Coating: a coating that conta ins relatively large quantities of metallic pigmentation for appearance and/or added p rotection.

3.52 Mold Release: a coating applied to a mold surf ace to prevent the molded piece from sticking to the mold as it is removed.

3.53 Non-Absorbent Container: a container made of non-porous material that does not allow the migration of solvents through it.

3.54 Non-Leaking Container: a container without li quid leak.

3.55 Non-Structural Adhesive: an adhesive that bon ds non-load carrying aircraft component in non-critical applications.

3.56 Normal Business Hours: Monday through Friday, 8:00 am to 5:00 pm.

3.57 Optical Anti-Reflective Coating: a coating wi th a low reflectance in the infrared and visible wavelength range and is used for anti-r eflection on or near optical and

laser hardware. 

   

3.58 Organic Solvent: the same as “Solvent.”

3.59 Organic Solvent Cleaning: as defined in Rule 4 663 (Organic Solvent Cleaning, Storage, and Disposal).

3.60 Part Marking Coating: coatings or inks used to make identifying markings on materials, components, and/or assemblies. These ma rkings may be either
permanent or temporary.

3.61 Phosphate Ester Resistant Wire Ink Coating: a coating that is used for surface identification or mark on aerospace wire or cable a nd which inhibits the corrosion caused by contact with phosphate ester type hydraul ic fluids.

3.62 Pretreatment Coating: a coating which contain s no more than 12 percent solids by weight, and at least one-half (0.5) percent acid, b y weight, to provide surface etching, and is applied directly to metal surfaces to provide corrosion resistance, adhesion and ease of stripping.

3.63 Primer: a coating applied directly to an aero space component for purposes of corrosion prevention, protection from the environme nt, functional fluid resistance and adhesion of subsequent coatings, adhesives, or sealants.

3.64 Radiation-Effect Coating: a coating which hel ps in the prevention of radar

detection.

3.65 Rain Erosion Resistant Coating: a coating tha t protects leading edges, flaps, stabilizers, and engine inlet lips against erosion caused by rain during flight.

3.66 Remanufactured Aircraft Part: an aerospace co mponent that is built as a spare part or replacement part subject to an existing com mercial aircraft specification.

3.67 Rocket Motor Nozzle Coating: a catalyzed epoxy coating system used in elevated temperature applications on rocket motor n ozzles.

3.68 Roll Coating: application of coatings from a paint trough to a flat surface by

mechanical series of rollers.

3.69 Scale Inhibitor: a coating that is applied to the surface of a part prior to thermal processing to inhibit the formation of tenacious sc ale.

3.70 SCAQMD: South Coast Air Quality Management Di strict.

3.71 Screen Print Ink: an ink used in screen printi ng processes during fabrication of

decorative laminates and decals. 

   

3.72 Sealant: a viscous semisolid material that fi lls voids in order to seal out water, fuel, and other liquids and solids, and in some cas es air movement, and is applied with a syringe, caulking gun, or spatula.

3.73 Silicone Insulation Material: an insulating ma terial applied to exterior metal surfaces for protection from high temperatures caus ed by atmospheric friction or engine exhaust. These materials differ from ablati ve coatings in that they are

not “sacrificial”.

3.74 Short Term Adhesive Bonding Primer: an adhesi ve bonding primer that has met the manufacturers’ required performance characteris tics following 1000 hours testing, used for metal to metal and metal to struc tural core bonding, and with an adhesive which is specified to be cured at a tem perature of 350 o F ± 10 ° F.

3.75 Solid Film Lubricant: a very thin coating con sisting of a binder system containing as its chief pigment material one (1) or more of th e following: molybdenum disulfide, graphite, polytetrafluoroethylene (PTFE) or other solids that act as a dry lubricant between closely-fitting surfaces.

3.76 Solvent: as defined in Rule 4663 (Organic Sol vent Cleaning, Storage, and Disposal).

3.77 Sonic and Acoustic Applications: the use of ae rospace materials on aerospace components that are subject to mechanical vibration and/or sound wave

cavitation.

3.78 Space Vehicle Coating: a coating applied to v ehicles designed to travel and operate beyond earth's atmosphere.

3.79 Specialized Function Coating: a coating that f ulfills specific engineering requirements that are limited in application and ar e characterized by low volume usage. This category excludes coatings covered in other Specialty Coating categories.

3.80 Stripper: a volatile liquid applied to remove a maskant for chemical processing, cured or dried paint, cured or dried paint residue or temporary protective coating.

3.81 Structural Adhesive - Autoclavable: an adhesi ve used to bond load-carrying aircraft components and is cured by heat and pressu re in an autoclave.

3.82 Structural Adhesive - Nonautoclavable: an adh esive cured under ambient conditions and is used to bond load-carrying aircra ft components or other critical functions, such as nonstructural bonding near engin es. 

   

3.83 Surface Cleaning: any method of cleaning outs ide of a degreaser, including, but not limited to, wipe cleaning and equipment flushin g.

3.84 Temporary Protective Coating: a coating appli ed to an aerospace component to protect it from mechanical and environmental damage during manufacturing or shipping.

3.85 Thermal Control Coating: a coating formulated with specific thermal conductive or radiative properties to permit temperature contr ol of the substrate.

3.86 Topcoat: a coating applied over a primer for purposes such as appearance, identification, or protection.

3.87 Transfer Efficiency: the ratio of the weight or volume of coating solids adhering to the part being coated to the weight or volume of coating solids used in the application process, expressed as a percentage.

3.88 Unicoat: a coating that is applied directly t o an aerospace component for purposes of corrosion protection, environmental protection a nd functional fluid resistance that is not subsequently topcoated. A unicoat is u sed in lieu of the application of a primer and a topcoat.

3.89 Volatile Organic Compounds (VOCs): as defined in Rule 1020 (Definitions).

3.90 Waste Solvent Material: any solvent which may contain dirt, oil, metal particles, sludge, and/or waste products, or wiping material containing VOCs including, but not limited to, paper, cloth, sponge , rag, or cotton swab used in organic solvent cleaning.

3.91 Wet Fastener Installation Coating: a primer or sealant applied by dipping, brushing, or daubing to fasteners that are installe d before the coating is cured.

3.92 Wing Coating: a coating that is corrosion res istant and is resilient enough to withstand the flexing of wings.

3.93 Wire Prebonding Etchant: a non-additive surfa ce treatment process to provide bondability of aerospace wire coatings to the under lying insulation layer.

4.0 Exemptions

4.1 Jet engine or rocket engine flushing operations using any solvent other than trichloroethylene are exempt from this rule. 

   

4.2 Except for the recordkeeping provisions of Sect ions 6.1.1 and 6.1.4, the requirements of Section 5.0 shall not apply to aero space assembly and component coating operations using not more than fo ur (4) gallons of products containing VOCs per day. Solvent-containing materi als used in operations subject to Rule 4662 (Organic Solvent Degreasing Op erations), shall not be

included in this determination.

4.3 Except for the provisions of Section 6.0, Secti on 5.0 shall not apply to laboratories which apply coatings, solvents, and adhesives to te st specimens for purpose of research, development, quality control, and testing for production-related operations. Any person claiming this exemption sha ll provide operational records, data and calculations, as determined by the APCO to be necessary, to substantiate

this claim.

4.4 The provisions of Section 5.1 of this rule shal l not apply to:

4.4.1 Coatings or aerosols with separate formulatio ns that are used in volumes of less than one (1) gallon on any day or 20 gallons i n any calendar year at an aerospace assembly and component coating stationary source, or

4.4.2 Adhesives with separate formulations that are used in volumes of less than one half (0.5) gallon on any day or ten (10) gallon s in any calendar year at an aerospace assembly and component coating station ary source.

Any operator seeking to claim the exemption in Sect ion 4.4 shall notify the APCO in writing that substitute compliant coatings are n ot available.

4.5 The provisions of Section 5.5 shall not apply t o the application of coatings that:

4.5.1 Contain less than 20 grams of VOC per liter o f coating less water and exempt compounds, or

4.5.2 Are dispensed from hand-held aerosol cans.

5.0 Requirements

5.1 Aerospace Coatings and Adhesives: After the applica ble effective date indicated in Table 1, an operator shall not apply to any aerospa ce component any coating, aerosol or adhesive with a VOC content, less water and exempt compounds, as applied, in excess of the limits in Table 1. 

   

Table 1 – VOC Content Limits (Grams of VOC Per Lite r of Coating [g/l], Less Water

and Exempt Compounds)

Product (VOC Containing Material) Before January 1,

2013 On and After

January 1, 2013

1. Ablative n/a 600 1

2. Adhesion Promoter 850 850

3. Adhesives

a. Non-Structural 250 250

b. Structural

i. Autoclavable 50 50

ii. Nonautoclavable 850 850
4. Adhesive Bonding Primers

a. New Commercial Aircraft 250 250
b. All Military Aircraft 805 805

c. Remanufactured Commercial Aircraft

Parts 805 805

d. Sonic and Acoustic Applications 805 805

e. Long Term 250 250

f. Short Term 250 250
5. Antichafe Coatings 600 600
6. Barrier Topcoat 420 420
7. Bearing Coating n/a 620 1

8. Caulking and Smoothing Compounds n/a 850 1

9. Chemical Agent Resistant Coating n/a 550 1

10. Clear Topcoat 520 520
11. Conformal Coating 750 750
12. Dry Lubricative Materials
a. Fastener Manufacturing 120 120
b. Nonfastener Manufacturing 675 675
13. Electric/Radiation Effect Coatings 800 800
14. Electromagnetic Interference Coating n/a 800 1

15. Fastener Sealants 675 600 2

16. Fire Resistant Coatings a. Civilian (Interior) 650 650 

   

Table 1 – VOC Content Limits (Grams of VOC Per Lite r of Coating [g/l], Less Water

and Exempt Compounds) continued

Product (VOC Containing Material) Before January 1,

2013 On and After

January 1, 2013
17. Flight Test Coatings Used on a. Missiles or Single-Use Target Craft 420 420

b. All others 600 600
18. Fuel Tank Coatings

a. General 420 420
b. Epoxy 420 420

19. Fuel Tank Adhesives 620 620
20. High Temperature Coating 850 850
21. Impact Resistant Coating 420 420
22. Intermediate Release Coating n/a 750 1

23. Lacquer n/a 830 1

24. Maskants - Chemical Milling 250 250
25. Metalized Epoxy Coating n/a 740 1

26. Mold Release n/a 780 1

27. Optical Anti-Reflective Coating 700 700
28. Part Marking Coating n/a 850 1

29. Pretreatment Coatings 780 780

30. Primers

a. General 350 350
b. Commercial Exterior Aerodynamic

Structure 350 350

31. Rain Erosion Resistant Coating 800 800

32. Rocket Motor Nozzle Coating n/a 660 1

33. Scale Inhibitor 880 880

34. Screen Prink Ink 840 840

35. Sealant (Extrudable/Rollable/Brushable) 600 28 0 3

36. Silicone Insulation Material n/a 850 1

37. Solid Film Lubricants a. Fastener Manufacturing 250 250

b. Fastener Installation 880 880 c. Nonfastener Manufacturing 880 880 38. Space Vehicle Coatings a. Electrostatic Discharge Protection 800 800 

   

Table 1 – VOC Content Limits (Grams of VOC Per Lite r of Coating [g/l], Less Water

and Exempt Compounds) continued

Product (VOC Containing Material) Before January 1,

2013 On and After

January 1, 2013
b. Other Space Vehicle Coatings 1000 1000

c. Adhesives 800 800
39. Specialized Function Coating n/a 890 1

40. Temporary Protective Coatings 250 250
41. Thermal Control Coating n/a 800 1

42. Topcoats 420 420
43. Epoxy Polyamide n/a 660 1
44. Unicoats (Self Priming Topcoats) 420 420
45. Wet Fastener Installation Coating n/a 675 1

46. Wing Coating 750 750
47. Wire Coatings

a. Electronic 420 420
b. Anti-Wicking 420 420
c. Pre-Bonding Etching 420 420
d. Phosphate Ester Resistant Ink 925 925

1 Coatings that have been designated as “classified” by the Department of Defense or coatings that are used on space vehicles are exempt from these coatin g limits.

2 Coatings that have been designated as “classified” by the Department of Defense or coatings that are used on space vehicles are exempt from the 600 g/l limit, but must comply with a 675 g/l limit.

3 Coatings that have been designated as “classified” by the Department of Defense or coatings that are used on space vehicles are exempt from the 280 g/l limit, but must comply with a 600 g/l limit.

5.2 Evaporative Loss Minimization

5.2.1 Surface Cleaning: No operator shall use a so lvent for surface cleaning, clean-up, or jet engine or rocket engine gas path c leaning or flushing, not exempt under Section 4.0 of this rule, excluding st ripping coatings or cleaning coating application equipment, unless:

5.2.1.1 the solvent contains less than 200 grams of VOC per liter (1.67 lb/gal) of material, as applied; or

5.2.1.2 the VOC composite vapor pressure of the sol vent is less than or equal to 45 mm Hg (0.87 psia) at a temperature of 6 8 ° F.

5.2.2 Coating Application Equipment Cleaning 

  
  An operator shall not use VOC-containing materials to clean spray equipment used for the application of coatings, adh esives, or ink, unless an enclosed system or equipment that is proven to b e equally effective at controlling emissions is used for cleaning. If an enclosed system is used, it must totally enclose spray guns, cups, nozzles, bowls, and other parts during washing, rinsing and draining procedures, an d it must be used according to the manufacturer’s recommendations and must be closed

when not in use.

5.2.3 In lieu of compliance with Sections 5.2.1 or 5.2.2, an operator may control VOC emissions from surface cleaning operati ons or from cleaning coating application equipment with a VOC e mission control system that meets the requirements of Section 5.6.

5.3 Coating Strippers

5.3.1 No operator shall use or specify for use with in the District a coating stripper unless it contains less than 300 grams of VOC per liter (2.5 lb/gal), as applied, or unless it has a VOC composi te vapor pressure of 9.5 mm Hg (0.18 psia) or less at 68 ° F.

5.3.2 In lieu of compliance with Section 5.3.1, an operator may control emissions from coating stripper operations with a V OC emission control system that meets the requirements of Section 5.6.

5.4 Storage and Disposal of VOC Containing Material s: An operator shall store or dispose of fresh or spent solvents, waste solvent c leaning materials such as cloth, paper, etc., coatings, adhesives, catalysts, and thinners in closed, nonabsorbent and non-leaking containers. The containe rs shall remain closed at all times except when depositing or removing the conten ts of the containers or when the container is empty.

5.5 Application Equipment Requirements: No operato r shall apply coatings subject to the provisions of this rule unless one (1) of the f ollowing methods is used:

5.5.1 Electrostatic application;

5.5.2 Electrodeposition;

5.5.3 High-Volume, Low- Pressure (HVLP) spray,

5.5.3.1 High-Volume, Low-Pressure (HVLP) spray equi pment shall be operated in accordance with the manufacturer's

recommendations. 

  
  5.5.3.2 For HVLP spray guns manufactured prior to J anuary 1, 1996, the end user shall demonstrate that the gun meets H VLP spray equipment standards. Satisfactory proof will be ei ther in the form of manufacturer's published technical material or by a demonstration using a certified air pressure tip ga uge, measuring the air atomizing pressure dynamically at the center of the air cap and at the air horns.

5.5.3.3 A person shall not sell or offer for sale f or use within the District any HVLP spray gun without a permanent mar king denoting the maximum inlet air pressure in psig at which the gun will operate within the parameters specified in Section 3.0.

5.5.4 Flow coating;

5.5.5 Roll coating;

5.5.6 Dip coating;

5.5.7 Brush coating.

5.5.8 In lieu of compliance with Sections 5.5.1 thr ough 5.5.7, an operator may control VOC emissions from application equipment wi th a VOC emission control system that meets the requirements of Section 5.6.

5.6 VOC Emission Control System

As an alternative to meeting the requirements of Se ctions 5.1, 5.2, 5.3, or 5.5, an operator may install a VOC emission control system provided that the VOC emission control system meets all of the following requirements:

5.6.1 The VOC emission control system shall be appr oved by the APCO.

5.6.2 The VOC emission control system shall comply with the requirements of Sections 5.6.3 through 5.6.5 during periods of emis sion-producing

activities.

5.6.3 The VOC control system’s VOC control device s hall have a control efficiency of at least 95 percent, by weight.

5.6.4 The VOC emission control system’s VOC collect ion device(s) shall have a capture efficiency of at least 90 percent by weight

. 

    5.6.5 In no case shall compliance through the use o f a VOC emission control system result in VOC emissions in excess of the VOC emissions which would result from compliance with applicable provis ions of Sections 5.1, 5.2, 5.3, or 5.5.

5.6.6 The minimum required overall capture and cont rol efficiency of an emission control system at which an equivalent or g reater level of VOC reduction will be achieved shall be calculated by u sing the following equation:

Where: CE = Minimum Required Overall Capture and Control

Efficiency, percent

VOC LWc = VOC Limit, less water and exempt compounds

VOC LWn,Max = Maximum VOC content of noncompliant coating used in

conjunction with a control device, less water and e xempt compounds

D n,Max = Density of solvent, reducer, or thinner containe d in the

noncompliant coating, containing the maximum VOC content of the multi-component coating

D c = Density of corresponding solvent, reducer, or th inner

used in the compliant coating system.

5.7 Prohibition of Solicitation: No person shall s olicit, specify, or require an operator to use any coating, solvent, spray equipment, or VO C emission control system that does not meet the limits or requirements of this ru le.

6.0 Administrative Requirements

6.1 Recordkeeping

6.1.1 An operator subject to the requirements of th is rule shall have coating manufacturer's specifications, either listed on the coating container, product data sheet, or on Material Safety Data Shee ts (MSDS), available for review and shall maintain daily records which s how the following information as applicable:

6.1.1.1 manufacturer name and type for each coating , solvent, thinner, reducer or stripper used,



## ( ) ( ) 100

x D / VOC -1 D

/ VOC -1

x VOC VOC -1 = CE

c LWc n, LWn,

LWn, LWc              

Max Max

Max 

    6.1.1.2 mix ratio, by volume, of components added t o the original material prior to application,

6.1.1.3 grams of VOC per liter of each coating, sol vent, thinner, reducer or stripper, less water and exempt compounds, as ap plied,

6.1.1.4 grams of VOC per liter of each solvent, thi nner, reducer, or stripper,

6.1.1.5 volume and method of application of each co ating, solvent, thinner, reducer or stripper applied, and

6.1.1.6 vapor pressure of solvents used.

6.1.2 An operator shall maintain records to support that the following coatings have been specified for their intended application.

6.1.2.1 adhesion promoter. 6.1.2.2 antichafe coating.

6.1.2.3 electric/radiation effect.

6.1.2.4 fuel tank adhesive. 6.1.2.5 high temperature coating. 6.1.2.6 impact resistant coating. 6.1.2.7 optical anti-reflective coating. 6.1.2.8 rain erosion resistant wing coating.

6.1.3 An operator using a VOC emission control syst em pursuant to Section 5.6 as a means of complying with this rule shall mainta in daily records of key system operating parameters and maintenance procedu res which will demonstrate continuous operation and compliance of the VOC emission control system during periods of emission-producing activities. Key system operating parameters are those necessary to ensure compliance with VOC limits. The parameters may include, but are no t limited to, temperatures, pressures, and flow rates.

6.1.4 An operator shall retain records for a minimum of five (5) years, make the records available on site during normal busines s hours to the APCO, ARB, or EPA, and submit the records to the APCO, AR B, or EPA upon
request.

6.2 Test Methods

6.2.1 Coating VOC content and solvent VOC content s hall be determined using

EPA Method 24 or its constituent methods. The VOC content of coatings 

    containing exempt halogenated VOCs shall be determi ned by using the ARB Method 432 or SCAQMD Method 303 (Determination of Exempt Compounds).

6.2.2 The solid content of pretreatment coatings sh all be determined using EPA Method 24. The acid content of pretreatment coatin gs shall be determined using ASTM Method D1613 06 (Standard Test for Acidi ty of Volatile Solvents and Chemical Intermediates used in Paint, Varnish, Lacquer and Related Products).

6.2.3 The test method for determining the fire resi stance of an interior coating shall be Federal Aviation Administration-required O hio State University Heat Release, Fire and Burn Tests.

6.2.4 The VOC composite vapor pressure of a blended solvent shall be determined by quantifying the amount of each organi c compound in the blend using gas chromatographic analysis SCAQMD Tes t Method 308 (Quantitation of Compounds by Gas Chromatography) a nd by calculating the VOC composite vapor pressure of the solvent by summing the product of the vapor pressure of each pure component and it s molar fraction. For the purpose of this calculation, the blend shall be assumed to be an ideal solution where Raoult's Law applies. The vapor pre ssure of each pure component shall be obtained from published referenc e manuals or

handbooks.

6.2.5 The VOC emissions from enclosed systems used to clean coating application equipment shall be determined by the ma nufacturer using the SCAQMD General Test Method for Determining Solvent Losses from Spray Gun Cleaning Systems.

6.2.6 The control efficiency of a VOC emission cont rol system’s control device(s) shall be determined using EPA Methods 2, 2A, 2C, or 2D for measuring flow rates and EPA Methods 25, 25A, or 25 B for measuring the total gaseous organic concentrations at the inlet a nd outlet of the control

device. EPA Method 18 or ARB Method 422 shall be u sed to determine the emissions of exempt compounds.

6.2.7 The capture efficiency of a VOC emission cont rol system’s collection device(s) shall be determined according to EPA’s “G uidelines for Determining Capture Efficiency,” January 9, 1995 an d 40 CFR 51, Appendix M, Methods 204-204F, as applicable, or any other method approved by EPA, ARB, and the APCO. 

    6.2.8 When more than one test method or set of test methods are specified for any emissions testing, a violation of any test esta blished in Section 6.2

shall constitute a violation of the rule. 

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