Chapter 391-3-1 Rules for Air Quality Control

PROPOSED AMENDMENTS TO THE RULES OF THE

DEPARTMENT OF NATURAL RESOURCES

ENVIRONMENTAL PROTECTION DIVISION RELATING TO AIR QUALITY, CHAPTER 391-3-1

The Rules of the Department of Natural Resources, C hapter 391-3-1, Air Quality Control are hereby amended, added to, repealed in part, revised , as hereinafter explicitly set forth in the attached amendments, additions, partial repeals, an d revisions for specific rules, or such subdivisions thereof as may be indicated.

[Note: Underlined text is proposed to be added. L ined-through text is proposed for deletion.]

Rule 391-3-1-.02(2)(a)6., “VOC Emission Standards, Exemptions, Area Designations, Compliance Schedules and Compliance Determinations, ” is being amended to read as

follows:

6. VOC Emission Standards, Exemptions, Area Design ations, Compliance Schedules and Compliance Determinations

(i) Exemptions and Area Designations.

(I) Sources located outside Cherokee, Clayton, Cob b, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding, and Roc kdale counties whose potential emissions of volatile organic compounds are not more than 100 tons per year shall not be subject to subparagraphs (u), (v), (x), (aa) through (ff) [inc lusive], (hh), (kk), (ll), (nn), and (qq) of this section 391-3-1-.02(2).

(II) Sources used exclusively for chemical or phys ical analysis or determination of product quality and commercial acceptance shall not be subj ect to subsections (t) through (ff) [inclusive], (hh) through (nn) [inclusive], (qq), and (tt) of th is section 391-3-1-.02(2), provided:

I. The operation of the source is not an integral part of the production process; and provided;

II. The emissions from the source do not exceed 80 0 pounds in any calendar month; and provided;

III. The exemption from such source is approved in writing by the Director.

(III) Sources located within Cherokee, Clayton, Co bb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding, or Rock dale counties whose actual emissions of volatile organic compounds are less than 15 pounds per day shall not be subject to subsections (u), (v), (x), (aa) through (ff) [inclusive], (kk), (ll), and (qq) of this section 391-3-1-.02(2).

(IV) Coatings, inks and other VOC-containing mater ials in use at sources of VOC emissions subject to any limitations or requirements of subse ctions (t) through (aa) [inclusive], (ii), (jj),Chapter 391-3-1 Rules for Air Quality Control

(mm), and (tt) of this section 391-3-1-.02(2) shall not be subject to any requirements of such subsections, provided the source’s total aggregate use of such materials is not in excess of 55 gallons per year and such exemption is approved in writing by the Division.

(V) Sources located within Barrow, Bartow, Carroll , Hall, Newton, Spalding, or Walton Counties whose actual emissions of volatile organic compound s are greater than or equal to 15 pounds per day shall be subject to subparagraphs (u), (v), (x), (aa) through (ff) [inclusive], (hh), (kk), (l l), (nn), and (qq) of this section 391-3-1-.02(2) effec tive January 1, 2015. The requirements of this subparagraph (V) will no longer be applicable if th e counties specified in this subparagraph (V) are re-designated to attainment for the 1997 Nation al Ambient Air Quality Standard for ozone prior to January 1, 2015. In the event the 1997 Na tional Ambient Air Quality Standard for ozone is violated in these counties or the counties speci fied in subparagraph (III) above, the requirements of this subparagraph (V) will only be reinstated if the Director determines that the measure is necessary to meet the requirements of th e contingency plan.

(ii) Compliance Schedules.

(I) All sources of VOC emissions subject to any li mitation or requirement of, or under, section 391-3-1-.02(2) prior to the effective date of this amended Rule 391-3-1-.02, shall be in compliance or on an approved compliance schedule.

(iii) Compliance Determinations.

(I) Compliance determinations for coatings express ed as pounds of VOC per gallon of coating, excluding water, shall treat organic compounds that are not defined as VOCs as water for purposes of calculating the “excluding water” part of the coating composition.

Rule 391-3-1-.02(2)(kkk), “VOC Emissions from Aeros pace Manufacturing and Rework Facilities,” is being amended to read as follows:

(kkk) VOC Emissions from Aerospace Manufacturing a nd Rework Facilities.

1. No person shall cause, let, permit, suffer, or allow the emissions of VOC from the coating of aerospace vehicles or components to exceed:

(i) 2.9 pounds per gallon of coating, excluding wa ter and exempt solvents, delivered to a coating applicator that applies primers. For gener al aviation rework facilities, the VOC limitation shall be 4.5 pounds per gallon of coating, excludin g water and exempt solvents, delivered to a coating applicator that applies primers.

(ii) 3.5 pounds per gallon of coating, excluding w ater and exempt solvents, delivered to a coating applicator that applies topcoats (including self-priming topcoats). For general aviation rework facilities, the VOC limitation shall be 4.5 pounds per gallon of coating, excluding water and exempt solvents, delivered to a coating applica tor that applies topcoats (including selfpriming topcoats).

(iii) The VOC content limits listed in Table (kkk) -1 below expressed in pounds per gallon of coating, excluding water and exempt solvents, deliv ered to a coating applicator that applies specialty coatings.Chapter 391-3-1 Rules for Air Quality Control

TABLE (kkk)1 Specialty Coating VOC Limitations

Coating Type VOC Content

Limit (lb/gal) Ablative Coating 5.0

Adhesion Promoter 7.4 Adhesive Bonding Primers:

Cured at 250 o F or below 7.1

Cured above 250 o F 8.6

Adhesives:

Commercial Interior Adhesive 6.3 Cyanoacrylate Adhesive 8.5

Fuel Tank Adhesive 5.2

Nonstructural Adhesive 3.0 Rocket Motor Bonding Adhesive 7.4

Rubber-based Adhesive 7.1

Structural Autoclavable Adhesive 0.5

Structural Nonautoclavable Adhesive 7.1 Antichafe Coating 5.5 Bearing Coating 5.2 Caulking and Smoothing Compounds 7.1 Chemical Agent-Resistant Coating 4.6 Clear Coating 6.0 Commercial Exterior Aerodynamic Structure Primer 5. 4 Compatible Substrate Primer 6.5 Corrosion Prevention Compound 5.9 Cryogenic Flexible Primer 5.4 Cryoprotective Coating 5.0 Dry Lubricative Material 7.3 Electric or Radiation-Effect Coating 6.7 Electrostatic Discharge and Electromagnetic Interfe rence (EMI) Coating 6.7

Elevated Temperature Skydrol Resistant Commercial

Primer 6.2

Epoxy Polyamide Topcoat 5.5 Fire-Resistant (Interior) Coating 6.7

Flexible Primer 5.3 Flight-Test Coatings: Missile or Single Use Aircraft 3.5

All Other 7.0 Fuel-Tank Coating 6.0 High-Temperature Coating 7.1 Insulation Covering 6.2 Intermediate Release Coating 6.3 Lacquer 6.9

Maskants: Bonding Maskant 10.3Chapter 391-3-1 Rules for Air Quality Control

Coating Type VOC Content

Limit (lb/gal)

Critical Use and Line Sealer Maskant 8.5

Seal Coat Maskant 10.3 Metallized Epoxy Coating 6.2

Mold Release 6.5 Optical Anti-Reflective Coating 6.3 Part Marking Coating 7.1 Pretreatment Coating 6.5 Rain Erosion-Resistant Coating 7.1 Rocket Motor Nozzle Coating 5.5

Scale Inhibitor 7.3

Screen Print Ink 7.0

Sealants:

Extrudable/Rollable/Brushable Sealant 2.3 Sprayable Sealant 5.0

Silicone Insulation Material 7.1

Solid Film Lubricant 7.3 Specialized Function Coating 7.4 Temporary Protective Coating 2.7 Thermal Control Coating 6.7 Wet Fastener Installation Coating 5.6 Wing Coating 7.1

(iv) 5.2 pounds per gallon of coating, excluding w ater and exempt solvents, delivered to a coating applicator that applies Type I chemical mil ling maskants.

(v) 1.3 pounds per gallon of coating, excluding wa ter and exempt solvents, delivered to a coating applicator that applies Type II chemical mi lling maskants.

(vi) The following aerospace activities are exempt for the coating emission limits in paragraphs 1.(i) through (v): touchup, aerosol, and DOD class ified coatings; coatings used on space vehicles; and facilities that comply with the low v olume usage exemption in paragraph 10.

2. The emission limitations in this subsection sha ll be achieved by:

(i) The application of low solvent coating technol ogy where each and every coating meets the specified applicable limitation expressed in pounds of VOC per gallon of coating, excluding water and exempt solvents, stated in section 1 of t his subsection; or

(ii) The application of low solvent coating technol ogy where the monthly volume-weighted average VOC content of each specified coating type meets the specified applicable limitation expressed in pounds of VOC per gallon of coating, e xcluding water and exempt solvents, stated in section 1 of this subsection; averaging is not a llowed between primers, topcoats (including self-priming topcoats), specialty coating types, Ty pe I milling maskants, and Type II milling maskants or any combination of the above coating ca tegories; orChapter 391-3-1 Rules for Air Quality Control

(iii) Control equipment, including but not limited to incineration, carbon adsorption and condensation, with a capture system approved by the Director, provided that the control system has a VOC reduction efficiency of 81 percent or gre ater.

3. Each owner or operator of an aerospace manufact uring and/or rework operation shall apply all non-exempt primers and topcoats utilizing one o r more of the application techniques specified below:

(i) Flow/curtain application;

(ii) Dip coat application;

(iii) Roll coating;

(iv) Brush coating;

(v) Cotton-tipped swab application;

(vi) Electrodeposition (dip) coating;

(vii) High-volume low-pressure (HVLP) spraying;

(viii) Electrostatic spray application; or

(ix) Other coating application methods that achiev e emission reductions equivalent to HVLP or electrostatic spray application methods, as determi ned by the Director.

4. Each owner or operator of an aerospace manufact uring and/or rework operation shall ensure that all application devices used to apply primers and topcoats (including self-priming topcoats) are operated according to company procedures, local specified operating procedures, and/or the manufacturer’s specifications, whichever is mos t stringent, at all times. Equipment modified by the owner or operator shall maintain a transfer efficiency equivalent to HVLP or electrostatic spray application techniques.

5. Each owner or operator of an aerospace manufact uring and/or rework operation shall comply with the following housekeeping requirements for an y affected cleaning operation. Aqueous cleaning solvents and hydrocarbon-based solvents wh ich have a maximum composite vapor pressure of 7 mm Hg at 20 o C are exempt from these requirements.

(i) Solvent-laden cloth, paper, or any other absor bent applicators used for cleaning shall be placed in bags or other closed containers upon comp leting their use. These bags and containers must be kept closed at all times except when depositing or removing these materials from the container. The bags and containers used m ust be of such a design so as to contain the vapors of the cleaning solvent. Cotton-tipped swabs used for very small cleaning operations are exempt from this requirement.

(ii) All fresh and spent cleaning solvents, except semi-aqueous solvent cleaners, used in aerospace cleaning operations shall be stored in cl osed containers.Chapter 391-3-1 Rules for Air Quality Control

(iii) Conduct the handling and transfer of cleanin g solvents to or from enclosed systems, vats, waste containers, and other cleaning operation equi pment that hold or store fresh spent cleaning solvents in such a manner that spills are minimized.

6. Each owner or operator of an aerospace manufact uring and/or rework operation utilizing hand-wipe cleaning operations (excluding the cleani ng of spray gun equipment performed in accordance with section 7) shall comply with one of the following:

(i) Utilize cleaning solvent solutions that are cl assified as an aqueous cleaning solvent and/or a hydrocarbon-based cleaning solvent with a maximum c omposite vapor pressure of 7 mm Hg at

20 o C.

(ii) Utilize cleaning solvent solutions that have a composite vapor pressure of 45 mm Hg or less

at 20 o C.

7. Each owner or operator of an aerospace manufact uring and/or rework operation shall clean all spray guns used in the application of primers, topcoats (including self-priming topcoats), and specialty coatings utilizing one or more of the fol lowing techniques:

(i) Enclosed System: Spray guns shall be cleaned i n an enclosed system that is closed at all times except when inserting or removing the spray g un. Cleaning shall consist of forcing cleaning solvent through the gun. If leaks are fou nd, repairs shall be made as soon as practicable, but no later than 15 days after the le ak was found. If the leak is not repaired by the 15th day after detection, the cleaning solvent shal l be removed and the enclosed cleaner shall be shut down until the leak is repaired or its use is permanently discontinued.

(ii) Nonatomized Cleaning: Spray guns shall be cl eaned by placing cleaning solvent in the pressure pot and forcing it through the gun with th e atomizing cap in place. No atomizing air is to be used. The cleaning solvent from the spray gu n shall be directed into a vat, drum, or other

waste container that is closed when not in use.

(iii) Disassembled Spray Gun Cleaning: Spray guns shall be cleaned by disassembling and cleaning the components by hand in a vat, which sha ll remain closed at all times except in use. Alternatively, the components shall be soaked in a vat, which shall remain closed during the soaking period and when not inserting or removing c omponents.

(iv) Atomizing cleaning: Spray guns shall be clea ned by forcing the cleaning solvent through the gun and directing the resulting atomized spray into a waste container that is fitted with a device designed to capture the atomized cleaning so lvent emissions.

8. Each owner or operator of an aerospace manufact uring and/or rework operation that includes a flush cleaning operation shall empty the used cleaning solvents each time aerospace parts or assemblies, or components of a coating uni t (with the exception of spray guns) are flush cleaned into an enclosed container or collection sy stem that is kept closed when not in use or into a system with equivalent emission control appr oved by the Director. Hydrocarbon-based solvents which have a maximum composite vapor press ure of 7 mm Hg at 20 o C and aqueous and semi-aqueous materials are exempt from the requ irements of this Section.Chapter 391-3-1 Rules for Air Quality Control

9. The following activities are not regulated by t his subsection:

(i) Research and development;

(ii) Quality control;

(iii) Laboratory testing activities;

(iv) Metal finishing;

(v) Electrodeposition (except for the electrodepos ition of paints);

(vi) Composites processing (except for cleaning an d coating of composite parts or components that become part of an aerospace vehicle or compone nt as well as composite tooling that comes in contact with such composite parts or compo nents prior to cure);

(vii) Electronic parts and assemblies (except for cleaning and topcoating of completed assemblies);

(viii) Manufacture of aircraft transparencies;

(ix) Wastewater treatment operations;

(x) Regulated activities associated with space veh icles designed to travel beyond the limit of the earth’s atmosphere, including but not limited t o satellites, space stations, and the space

shuttle;

(xi) Maintenance and rework of antique aerospace v ehicles and components.

10. The requirements for primers, topcoats, and ch emical milling maskants specified in subsections 1.(i), 1.(ii), 1.(iv) and 1.(v) do not apply to the use of low-volume coatings in these categories for which the rolling twelve month total of each separate formulation used at a facility does not exceed 50 gallons, and the combined rollin g twelve-month total of all such primers, topcoats, and chemical milling maskants used does n ot exceed 200 gallons. The requirements for specialty coatings specified in subsection 1.(i ii) do not apply to the use of low-volume specialty coatings for which the rolling twelve mon th total of each separate specialty coating formulation used at a facility does not exceed 50 g allons, and the combined rolling twelve-month total of all such specialty coating formulations us ed does not exceed 200 gallons. Coatings exempted under section 9 of this subsection are not included in these 50- and 200- gallon limits.

11. The following situations are exempt from the r equirements of Sections 3 and 4:

(i) Any situation that normally requires the use o f an airbrush or an extension on the spray gun to properly reach limited access spaces;

(ii) The application of any specialty coating;Chapter 391-3-1 Rules for Air Quality Control

(iii) The application of coatings that contain fil lers that adversely affect atomization with HVLP spray guns and that cannot be applied by any of the application methods specified in subparagraph 3.;

(iv) The application of coatings that normally hav e a dried film thickness of less than 0.0013 centimeter (0.0005 inches) and that cannot be appli ed by any of the application methods specified in section 3.;

(v) The use of airbrush application methods for st enciling, lettering, and other identification markings;

(vi) The use of hand-held spray (aerosol) can appl ication methods; and

(vii) Touchup and repair operations.

12. The following cleaning operations are exempt f rom the requirements of Section 6 of this

subsection:

(i) Cleaning during the manufacture, assembly, ins tallation, maintenance, or testing of components of breathing oxygen systems that are exp osed to the breathing oxygen;

(ii) Cleaning during the manufacture, assembly, in stallation, maintenance, or testing of parts, subassemblies, or assemblies that are exposed to st rong oxidizers or reducers (e.g., nitrogen tetroxide, liquid oxygen, or hydrazine);

(iii) Cleaning and surface activation prior to adh esive bonding;

(iv) Cleaning of electronic parts and assemblies c ontaining electronic parts;

(v) Cleaning of aircraft and ground support equipm ent fluid systems that are exposed to the fluid including air-to-air heat exchangers and hydr aulic fluid systems;

(vi) Cleaning of fuel cells, fuel tanks, and confi ned spaces;

(vii) Surface cleaning of solar cells, coating opt ics, and thermal control surfaces;

(viii) Cleaning during fabrication, assembly, inst allation, and maintenance of upholstery, curtains, carpet, and other textile materials used in the interior of the aircraft;

(ix) Cleaning of metallic and non-metallic materia ls used in honeycomb cores during the manufacture or maintenance of these cores, and clea ning of the completed cores used in the manufacture or maintenance of aerospace vehicles or components;

(x) Cleaning of aircraft transparencies, polycarbo nate, or glass substrates;

(xi) Cleaning and solvent usage associated with re search and development, quality control, and laboratory testing;Chapter 391-3-1 Rules for Air Quality Control

(xii) Cleaning operations, using nonflammable liqu ids, conducted within five feet of energized electrical systems. Energized electrical systems m eans any AC or DC electrical circuit on an assembled aircraft once electrical power is connect ed, including interior passenger and cargo

areas, wheel wells, and tail sections; and

(xiii) Cleaning operations identified as essential uses under the Montreal Protocol for which the

U.S. EPA has allocated essential use allowances or exemptions.

13. Each owner or operator of an aerospace manufac turing and/or rework operation shall submit a monitoring plan to the Division that speci fies the applicable operating parameter value, or range of values, to ensure ongoing compliance wi th Subsection 2.(iii) of this subsection. The monitoring device shall be installed, calibrated, o perated, and maintained in accordance with the manufacturer’s specifications.

14. Each owner or operator of an aerospace manufac turing and/or rework operation utilizing an enclosed spray gun cleaner shall visually inspect t he seals and all other potential sources of leaks at least once per month. Each inspection sha ll occur while the spray gun cleaner is in operation.

15. Each owner or operator of an aerospace manufac turing and/or rework operation utilizing coatings specified in Section 1 shall maintain a cu rrent list of coatings that includes the specific category, VOC content as applied, and the monthly a mount used for each coating.

16. Each owner or operator of an aerospace manufac turing and/or rework operation utilizing cleaning solvents shall maintain the following reco rds:

(i) Maintain a current list of hand-wipe and flush cleaning solvents with documentation that demonstrates that the cleaning solvent complies wit h one of the composition requirements in Section 6.(i) and for semi aqueous cleaning solvent used for flush cleaning. This list shall include the annual amount of each applicable solven t used.

(ii) Maintain a current list of hand-wipe cleaning solvents with their respective vapor pressures or, for blended solvents, VOC composite vapor press ures for all vapor pressure compliant handwipe cleaning solvents listed in Section 6.(ii). T his list shall include the monthly amount of each applicable solvent used.

(iii) Maintain a current list of all cleaning solv ents with a vapor pressure greater than 45 mm Hg used in exempt hand-wipe cleaning operations. This list shall identify the applicable exemption(s) for each process and include the month ly amount of each applicable solvent used.

(iv) Maintain a record of all leaks from enclosed g un cleaners, as found during the monthly inspection required by subparagraph 14. of this sub section. The record shall include the identification of the leaking paint gun cleaner, th e date the leak was discovered, and the date the leak was repaired.

17. For the purpose of this subsection, the follow ing definitions shall apply:

(i) “Ablative coating” means a coating that chars when exposed to open flame or extreme temperatures, as would occur during the failure of an engine casing or during aerodynamicChapter 391-3-1 Rules for Air Quality Control

heating. The ablative char surface serves as an in sulative barrier, protecting adjacent components from the heat or open flame.

(ii) “Adhesion promoter” means a very thin coating applied to a substrate to promote wetting and form a chemical bond with the subsequently appl ied material.

(iii) “Adhesive bonding primer” means a primer app lied in a thin film to aerospace components for the purpose of corrosion inhibition and increas ed adhesive bond strength by attachment. There are two categories of adhesive bonding primer s: primers with a design cure at 250 o F or below and primers with a design cure above 250 o F.

(iv) “Aerosol coating” means a coating applied by means of a hand-held, pressurized container,

which is non-refillable or which utilizes non-refil lable propellant canisters and which expels an adhesive or a coating in a finely divided spray whe n a valve on the container is depressed.

(v) “Aerospace facility” means any facility that p roduces, reworks, or repairs in any amount any commercial, civil, or military aerospace vehicle or component. Regulated activities include coating, milling, solvent use, and depainting opera tions.

(vi) “Aerospace vehicle or component” means any fa bricated part, processed part, assembly of parts, or completed unit, with the exception of ele ctronic components, of any aircraft.

(vii) “Aircraft transparency” means the aircraft w indshield, canopy, passenger windows, lenses and other components which are constructed of trans parent materials.

(viii) “Antichafe coating” means a coating applied to areas of moving aerospace components that may rub during normal operations or installati on.

(ix) “Antique aerospace vehicle or component” mean s an aircraft or component thereof that was built at least 30 years ago. An antique aerospace vehicle would not routinely be in commercial or military service in the capacity for which it wa s designed.

(x) “Aqueous cleaning solvent” means a cleaning so lvent in which water is the primary ingredient (greater than 80 percent by weight of cl eaning solvent solution as applied must be water). Detergents, surfactants, and bioenzyme mix tures and nutrients may be combined with the water along with a variety of additives such as organic solvents (e.g., high boiling point alcohols), builders, saponifiers, inhibitors, emuls ifiers, pH buffers, and antifoaming agents. Aqueous solutions must have a flash point greater t han 93 o C (200 o F) (as reported by the manufacturer) and the solution must be miscible wit h water.

(xi) “Bearing coating” means a coating applied to an antifriction bearing, a bearing housing, or the area adjacent to such a bearing in order to fac ilitate bearing function or to protect base

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.

(xii) “Bonding maskant” means a temporary coating used to protect selected areas of aerospace parts from strong acid or alkaline soluti ons during processing for bonding.Chapter 391-3-1 Rules for Air Quality Control

(xiii) “Caulking and smoothing compounds” means se mi-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 accesses. A materi al shall not be classified as a caulking and smoothing compound if it can be classified as a sea lant.

(xiv) “Chemical agent-resistant coating (CARC)” me ans an exterior topcoat designed to withstand exposure to chemical warfare agents or th e decontaminants used on these agents.

(xv) “Chemical milling maskants” means a coating t hat is applied directly to aluminum components to protect surface areas when chemical m illing 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 e tchant. This definition does not include bonding maskants, critical use and line sealer mask ants, and seal coat maskants. Additionally, maskants that must be used with a combination of Ty pe I or Type II etchants and any of the above types of maskants are also not included in th is definition.

(xvi) “Cleaning operation” means collectively spra y-gun, hand-wipe, and flush cleaning operations.

(xvii) “Cleaning solvent” means a liquid material used for hand-wipe, spray gun, or flush cleaning. This definition does not include solutio ns that contain no VOCs (i.e., VOC content less than 1.0 weight percent).

(xviii) “Clear coating” means a transparent coatin g applied over a colored opaque coating, metallic substrate, or placard to give improved glo ss and protection to the color coat. In some cases, a clearcoat refers to any transparent coatin g without regard to substrate.

(xix) “Coating” means a material that is applied t o the surface of an aerospace vehicle or component to form a decorative, protective, or func tional solid film, or the solid film itself.

(xx) “Coating operation” means using a spray booth , tank, or other enclosure or any area, such as a hangar, for applying a single type of coating (e.g., primer); using the same spray booth for applying another type of coating (e.g., topcoat) co nstitutes a separate coating operation for which compliance determinations are performed separ ately.

(xxi) “Coating unit” means a series of one or more coating applicators and any associated drying area and/or oven wherein a coating is applie d, dried, and/or cured. A coating unit ends at the point where the coating is dried or cured, or p rior to any subsequent application of a different coating. It is not necessary to have an oven or fl ashoff area to be included in this definition.

(xxii) “Commercial exterior aerodynamic structure primer” means a primer used on aerodynamic components and structures that protrude from the fuselage, such as wings and attached components, control surfaces, horizontal s tabilizers, vertical fins, wing-to-body fairings, antennae, landing gear, and doors, for the purpose of extended corrosion protection and

enhanced adhesion.

(xxiii) “Commercial interior adhesive” means mater ials used in the bonding of passenger cabin interior components. These components must meet FA A fireworthiness requirements.Chapter 391-3-1 Rules for Air Quality Control

(xxiv) “Compatible substrate primer” means either compatible epoxy primer or adhesive primer.

(xxv) “Corrosion prevention compound” means a comp ound that provides corrosion protection by displacing water and penetrating mating surfaces , forming a protective barrier between the metal surface and moisture. Coatings containing oi ls or waxes are excluded from this category.

(xxvi) “Critical use and line sealer maskant” mean s 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-p recision aluminum chemical milling of deep cuts, and aluminum chemical milling of complex shap es. Materials used for repairs or to bridge gaps left by scrubbing operations are also included in this category.

(xxvii) “Cryogenic flexible primer” means a primer designed to provide corrosion resistance, flexibility, and adhesion of subsequent coating sys tems when exposed to loads up to and surpassing the yield point of the substrate at cryo genic temperatures (-275 o F and below).

(xxviii) “Cryoprotective coating” means a coating that insulates cryogenic or subcooled surfaces to limit propellant boil-off, maintain structural i ntegrity of metallic structures during ascent or reentry, and prevent ice formation.

(xxix) “Cyanoacrylate adhesive” means a fast-setti ng, single component adhesive that cures at room temperature. Also known as “super glue.”

(xxx) “Depainting operation” means the use of a ch emical agent, media blasting, or any other technique to remove permanent coatings from the out er surface of an aerospace vehicle or components. The depainting operation includes wash ing of the aerospace vehicle or component to remove residual stripper, media, or co ating residue.

(xxxi) “Dry lubricative material” means a coating consisting of lauric acid, cetyl alcohol, waxes,

or other noncross linked resin-bond materials that act as a dry lubricant.

(xxxii) “Electric or radiation-effect coating” mea ns a coating or coating system engineered to interact, through absorption or reflection, with sp ecific regions of the electromagnetic energy spectrum, such as the ultraviolet, visible, infrare d, or microwave regions. Uses include, but are not limited to, lighting strike protection, electro magnetic pulse (EMP) protection, and radar avoidance. Coatings that have been designated as “ classified” by the Department of Defense

are exempt.

(xxxiii) “Electrostatic discharge and electromagne tic interference (EMI) coating” means a coating applied to space vehicles, missiles, aircra ft radomes, and helicopter blades to disperse static energy or reduce electromagnetic interferenc e.

(xxxiv) “Elevated-temperature Skydrol-resistant co mmercial primer” means a primer applied primarily to commercial-type aircraft that must wit hstand immersion in phosphate-ester (PE) hydraulic fluid (Skydrol 500b or equivalent) at the elevated temperature of 150 o F for 1,000

hours.Chapter 391-3-1 Rules for Air Quality Control

(xxxv) “Epoxy polyamide topcoat” means a coating u sed where harder films are required or in some areas where engraving is accomplished in camou flage colors.

(xxxvi) “Exempt solvent” means a specified organic compound that has been determined by the EPA to have negligible photochemical reactivity and is listed in 40 CFR 51.100 and/or 391-3-1- .01(llll).

(xxxvii) “Fire-resistant (interior) coating” means for civilian aircraft, fire-resistant coatings are used on passenger cabin interior parts that are sub ject to the FAA fire-worthiness requirements. For military aircraft, fire-resistant interior coat ings are used on parts that are subject to the flammability requirements of MIL-STD-1630A and MIL- A-87721. For space applications, these coatings are used on parts that are subject to the flammability requirements of SE-R-0006 and

SSP 30233.

(xxxviii) “Flexible primer” means a primer that me ets flexibility requirements such as those needed for adhesive bond primer fastener heads or o n 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 fasteners, skin, and skin-to-skin joints on outer aircraft skins.

(xxxix) “Flight test coating” means a coating appl ied to aircraft other than missiles or single-use aircraft prior to flight testing to protect the air craft from corrosion and to provide required marking during flight test evaluation.

(xl) “Flush cleaning” means the removal of contami nants such as dirt, grease, and coatings from an aerospace vehicle or component or coating e quipment by passing solvent over, into, or through the item being cleaned. The solvent may si mply be poured into the item cleaned and then drained, or be assisted by air or hydraulic pr essure, or by pumping. Hand-wipe cleaning operations where wiping, scrubbing, mopping, or oth er hand actions used are not included in

this definition.

(xli) “Fuel tank adhesive” means a non-rubber base d adhesive used to bond components exposed to fuel and which must be compatible with f uel tank coatings.

(xlii) “Fuel tank coating” means a coating applied to fuel tank components for the purpose of corrosion and/or bacterial growth inhibition and to assure sealant adhesion in extreme

environmental conditions.

(xliii) “General aviation” means that segment of c ivil aviation that encompasses all facets of aviation except air carriers, commuters, and milita ry. General aviation includes charter and corporate-executive transportation, instruction, re ntal, aerial application, aerial observation, business, pleasure, and other special uses.

(xliv) “General aviation rework facility” means an y aerospace facility with the majority of its revenues resulting from the reconstruction, repair, maintenance, repainting, conversion, or alteration of general aviation aerospace vehicles o r components.Chapter 391-3-1 Rules for Air Quality Control

(xlv) “Hand-wipe cleaning operation” means removin g contaminants such as dirt, grease, oil, and coatings from an aerospace vehicle or component by physically rubbing it with a material such as a rag, paper, or cotton swab that has been moistened with a cleaning solvent.

(xlvi) “High temperature coating” means a coating designed to withstand temperatures of more

than 350 o F.

(xlvii) “High volume low pressure (HVLP) spray equ ipment” means spray equipment that is used to apply coating by means of a spray gun that operates at 10.0 psig of atomizing air pressure or less at the air cap.

(xlviii) “Hydrocarbon-based cleaning solvent” mean s a cleaning solvent that is composed of a mixture of photochemically reactive hydrocarbons an d oxygenated hydrocarbons and have a maximum vapor pressure of seven mm Hg at 20 o C. These cleaners also contain no hazardous air pollutants.

(il) “Insulation covering” means material that is applied to foam insulation to protect the insulation from mechanical or environmental damage.

(l) “Intermediate release coating” means a thin co ating applied beneath topcoats to assist in removing the topcoats in depainting operations and generally to allow the use of less hazardous depainting methods.

(li) “Lacquer” means a clear or pigmented coating formulated with a nitrocellulose or synthetic resin to dry by evaporation without a chemical reac tion. Lacquers are resoluble in their original

solvent.

(lii) “Leak” means any visible leakage, including misting and clouding.

(liii) “Metallized epoxy coating” means a coating that contains relatively large quantities of metallic pigmentation for appearance and/or added p rotection.

(liv) “Mold release” means a coating applied to a mold surface to prevent the molded piece from sticking to the mold as it is removed.

(lv) “Nonstructural adhesive” means an adhesive th at bonds nonload bearing aerospace components in noncritical applications and is not c overed in any other specialty adhesive categories.

(lvi) “Optical antireflection coating” means a coa ting with a low reflectance in the infrared and visible wavelength ranges that is used for antirefl ection on or near optical and laser hardware.

(lvii) “Part marking coating” means coatings or in ks used to make identifying markings on material, components, and/or assemblies. These mar kings may be either permanent or

temporary.

(lviii) “Pretreatment coating” means an organic co ating that contains at least 0.5 percent acids by weight and is applied directly to metal or compo site surfaces provide surface etching, corrosion resistance, adhesion, and ease of strippi ng.Chapter 391-3-1 Rules for Air Quality Control

(lix) “Primer” means the first layer and any subse quent layers of identically formulated coating applied to the surface of an aerospace vehicle or c omponent. Primers are typically used for corrosion prevention, protection from the environme nt, functional fluid resistance, and adhesion of subsequent coatings. Primers that are defined a s specialty coatings are not included under

this definition.

(lx) “Rain erosion-resistant coating” means a coat ing or coating system used to protect leading edges of parts such as flaps, stabilizers, radomes, engine inlet nacelles, etc., against erosion caused by rain impact during flight.

(lxi) “Research and development” means an operatio n whose primary purpose is for research and development of new processes and products and t hat is conducted under the close supervision of technically trained personnel and is not involved in the manufacture of final or intermediate products for commercial purposes, exce pt in a de minimis manner.

(lxii) “Rocket motor bonding adhesive” means an ad hesive used in rocket motor bonding applications.

(lxiii) “Rocket motor nozzle coating” means a cata lyzed epoxy coating system used in elevated temperature applications on rocket motor nozzles.

(lxiv) “Rubber-based adhesive” means a quick setti ng contact cement that provide a strong, yet flexible bond between two mating surfaces that may be of dissimilar materials.

(lxv) “Scale Inhibitor” means a coating that is a pplied to the surface of a part prior to thermal processing to inhibit the formation of scale.

(lxvi) “Screen print ink” means an ink used in scr een printing processes during fabrication of

decorative laminates and decals.

(lxvii) “Sealant” means a material used to prevent the intrusion of water, fuel, air, or other liquids or solids from certain areas of aerospace v ehicles or components.

(lxviii) “Seal coat maskant” means an overcoat app lied over a maskant to improve abrasion and chemical resistance during production operations.

(lxix) “Self-priming topcoat” means a topcoat tha t is applied directly to an uncoated aerospace vehicle or component for purposes of corrosion prev ention, environmental protection, and functional fluid resistance. More than one layer o f identical coating formulation may be applied to the vehicle or component.

(lxx) “Semi-aqueous cleaning solvent” means a solu tion in which water is a primary ingredient (greater than 60 percent by weight of the solvent s olution as applied must be water).

(lxxi) “Silicone insulation material” means an ins ulating material applied to exterior metal surfaces for protection from high temperatures caus ed by atmospheric friction or engine

exhaust. These materials differ from ablative coat ings in that they are not “sacrificial.”Chapter 391-3-1 Rules for Air Quality Control

(lxxii) “Solid film lubricant” means a very thin c oating consisting of a binder system containing as its main pigment material one or more of the fol lowing: molybdenum, graphite, polytetrafluoroethylene (PTFE), or other solids tha t act as a dry lubricant between faying

surfaces.

(lxxiii) “Specialty coating” means a coating that, even though it meets the definition of a primer, topcoat, or self-priming topcoat, has additional pe rformance criteria beyond those of primers, topcoats, and self-priming topcoats for specific ap plications. These performance criteria may include, but are not limited to, temperature or fir e resistance, substrate compatibility, antireflection, temporary protection or marking, se aling, adhesively joining substrates, or enhanced corrosion protection.

(lxxiv) “Specialized function coating” means a coa ting that fulfills extremely specific engineering requirements that are limited in application and ar e characterized by low volume usage. This category excludes coatings covered in other Special ty coating categories.

(lxxv) “Spray gun” means a device that atomizes a coating or other material and projects the particulates or other material onto a substrate.

(lxxvi) “Structural autoclavable adhesive” means a n adhesive used to bond load-carrying aerospace components that is cured by heat and pres sure in an autoclave.

(lxxvii) “Structural nonautoclavable adhesive” mea ns an adhesive used to bond load-carrying aerospace components that is cured under ambient co nditions.

(lxxviii) “Surface preparation” means the removal of contaminants from the surface of an aerospace vehicle or component or the activation or reactivation of the surface in preparation for the application of a coating.

(lxxix) “Temporary protective coating” means a coa ting applied to provide scratch or corrosion protection during manufacturing, storage, or transp ortation. Two types include peelable protective coatings and alkaline removable coatings . These materials are not intended to protect against strong acid or alkaline solutions.

(lxxx) “Thermal control coating” means a coating f ormulated with specific thermal conductive or radiative properties to permit temperature control of the substrate.

(lxxxi) “Topcoat” means a coating that is applied over a primer on a aerospace vehicle or component for appearance, identification, camouflag e, or protection. Topcoats that are defined as specialty coatings are not included under this d efinition.

(lxxxii) “Touch-up and repair coating” means a coa ting used to cover minor coating imperfections appearing after the main coating oper ation.

(lxxxiii) “Touch-up and repair operation” means th at portion of the coating operation that is the incidental application of coating used to cover min or imperfections in the coating finish or to achieve complete coverage. This definition include s out-of-sequence or out-of-cycle coating.Chapter 391-3-1 Rules for Air Quality Control

(lxxxiv) “Type I etchant” means a chemical milling etchant that contains varying amounts of

dissolved sulfur and does not contain amines.

(lxxxv) “Type II etchant” means a chemical milling etchant that is a strong sodium hydroxide solution containing amines.

(lxxxvi) “Wet fastener installation coating” means a primer or sealant applied by dipping, brushing, or daubing to fasteners that are installe d before the coating is cured.

(lxxxvii) “Wing coating” means a corrosion-resista nt topcoat that is resilient enough to withstand the flexing of the wings.

18. Applicability.

(i) The requirements of this subsection shall appl y to all aerospace facilities with potential emissions of volatile organic compounds exceeding 1 00 tons per year, except in the counties of Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, F ayette, Forsyth, Fulton, Gwinnett, Henry, Paulding, and Rockdale, where facilities with poten tial emissions of volatile organic compounds exceeding 25 tons per year are subject to this subs ection.

(ii) Effective January 1, 2015, the requirements o f this subsection shall apply to all aerospace facilities with potential emissions of volatile org anic compounds exceeding 25 tons per year in Barrow, Bartow, Carroll, Hall, Newton, Spalding, or Walton County. The requirements of this subparagraph (ii) will no longer be applicable if t he counties specified in this subparagraph (ii) are re-designated to attainment for the 1997 Nation al Ambient Air Quality Standard for ozone prior to January 1, 2015. In the event the 1997 Na tional Ambient Air Quality Standard for ozone is violated in these counties or the counties speci fied in subparagraph (i) above, the requirements of this subparagraph (ii) will only be reinstated if the Director determines that the measure is necessary to meet the requirements of th e contingency plan.

19. Compliance Dates.

(i) All aerospace facilities subject to this subse ction and located in the counties of Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Fo rsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale shall be in compliance.

(ii) All aerospace facilities subject to this subs ection; located outside Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale counties; and in operation on or before October 1, 1999, shall be in compliance by January 1,

2001.

(iii) All aerospace facilities subject to this sub section; located outside Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale counties; and which begin initial operation after O ctober 1, 1999, shall be in compliance upon

startup.

Authority: O.C.G.A. Section 12-9-1 et seq., as ame nded.