SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-1 

RULE 451 SURFACE COATING OF MISCELLANEOUS METAL PARTS AND PRODUCTS

Adopted 6-19-79

(Amended 1-11-80, 12-14-82, 4-5-83, 11-29-83, 8-27-85, 9-29-87, 2-23-93, 9-5-96, 10-02-97, 9-25-08, 

10-28-10)

INDEX

100 GENERAL

101 PURPOSE 

102 APPLICABILITY 

103 SEVERABILITY 

110 EXEMPTION, LOW USAGE OF MATERIALS EXCEEDING VOC CONTENT LIMITS 

111 EXEMPTION, OPERATIONS SUBJECT TO OTHER DISTRICT RULES 

112 EXEMPTION, SPECIFIC OPERATIONS AND COATINGS 

113 EXEMPTION, AEROSOL CONTAINERS 

114 EXEMPTION, APPLICATION EQUIPMENT 

115 EXEMPTION, COATINGS FOR METAL FURNITURE

116 EXEMPTION, AUTOMOBILE AND LIGHT-DUTY TRUCK ASSEMBLY COATING 

OPERATIONS

200 DEFINITIONS

201 ADHESIVE 

202 AEROSOL CONTAINER 

203 AIR-DRIED COATING 

204 ALUMINUM COATING FOR WINDOW FRAMES AND DOOR FRAMES 

205 APPURTENANCESAPPLICATION EQUIPMENT

206 APPLICATION EQUIPMENTAPPURTENANCES

207 AUTOMOBILE

208 AUTOMOBILE AND LIGHT-DUTY TRUCK ASSEMBLY COATING OPERATIONS

2097 BAKED COATINGS 

2108 CAMOUFLAGE COATINGS 

21109 CLEANUP MATERIAL 

2120 CLOSED CONTAINER 

2131 COATING 

2142 COATING REMOVER (STRIPPER) 

213 CONFORMAL COATING

2154 DIP COAT 

2165 ELECTRICAL INSULATING COATING 

2176 ELECTROSTATIC SPRAY 

217 ENCLOSED GUN CLEANER

218 END USER

219 ETCHING FILLER

22019 EXEMPT COMPOUND 

2210 EXTREME HIGH GLOSS COATING 

2221 EXTREME PERFORMANCE COATING 

2232 FLOW COAT 

2243 HAND APPLICATION EQUIPMENT 

2254 HAND LETTERING 

2265 HEAT RESISTANT COATING 

2276 HIGH-VOLUME LOW-PRESSURE APPLICATION EQUIPMENT 

2287 LOW-VOLUME LOW-PRESSURE APPLICATION EQUIPMENT 

229 LIGHT-DUTY TRUCK

23028 MAGNETIC DATA STORAGE DISC

231 MASK COATING

23229 METAL FURNITURE 

2330 METALLIC/IRIDESCENT COATING 

2341 MISCELLANEOUS METAL PARTS AND PRODUCTS 

2352 MULTI-COMPONENT COATING 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-2 October 28, 2010September 25, 2008

2363 NON-COMPLIANT COATINGMATERIAL

2374 NON-SKID COATING 

2385 PRE-FABRICATED ARCHITECTURAL COMPONENT 

2396 PRETREATMENT WASH PRIMER 

24037 REPAIR COATING 

24138 ROLL COATER 

24239 SAFETY-INDICATING COATING 

2430 SHOP ENVIRONMENT 

2441 SILICONE RELEASE COATING 

2452 SOLAR ABSORBENT COATING 

2463 STATIONARY SOURCE 

2474 STENCIL COATING 

2485 SURFACE PREPARATION MATERIAL 

2496 TEXTURED FINISH COATING

25047 TOUCH-UP COATING 

25148 VOLATILE ORGANIC COMPOUND (VOC) 

25249 VOLATILE ORGANIC COMPOUND (VOC) AS APPLIED 

300 STANDARDS

301 VOC CONTENT OF COATINGS FOR MISCELLANEOUS METAL PARTS AND 

PRODUCTS 

302 VOC CONTENT OF COATINGS FOR METAL FURNITURE 

303 VOC CONTENT FOR COATING REMOVERS (STRIPPERS) 

304 APPLICATION EQUIPMENT REQUIREMENTS 

305 SURFACE PREPARATION, CLEANUP, AND STORAGE REQUIREMENTS 

306 EMISSION CONTROL SYSTEM REQUIREMENTS 

400 ADMINISTRATIVE REQUIREMENTS

401 LOW USAGE EXEMPTION SUBMITTAL 

402 PRODUCT INFORMATION REQUIREMENTS FOR SELLERS 

403 CALCULATION FOR DETERMINING VOC CONTENT OF COATINGS, LESS WATER 

AND EXEMPT COMPOUNDS 

404 CALCULATION FOR DETERMINING VOC CONTENT OF COATING REMOVERS 

(STRIPPERS) AND SURFACE PREPARATION AND CLEANUP MATERIAL 

405 CALCULATION FOR DETERMINING PERCENT CONTROL EFFICIENCY AND VOC 

MASS EMISSION RATE 

406 CALCULATION FOR DETERMINING OVERALL SYSTEM EFFICIENCY 

407 OPERATION AND MAINTENANCE PLAN 

500 MONITORING AND RECORDS

501 RECORDKEEPING FOR END USERS 

502 TESTING PROCEDURES 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-3 

100 GENERAL

101 PURPOSE: To limit the emission of volatile organic compounds from the application of 

coatings, coating removers (strippers), surface preparation material, and cleanup material to 

miscellaneous metal parts and products in a shop environment. 

102 APPLICABILITY: The provisions of this rule shall apply to any person who uses, applies, or 

solicits the use or application of any miscellaneous metal parts and products within the 

District to the coating, coating remover (stripper), surface preparation material, and cleanup 

material within the Districtof miscellaneous metal parts and products including coating 

removal (stripping), surface preparation and cleanup operations by any person, as defined in 

this rule. Only the provisions in Sections 402, 403, 404, and 502 apply to persons who 

supply, sell, offer for sale, manufacture, or distribute any miscellaneous metal parts and 

products coating, coating remover (stripper), surface preparation material, and cleanup 

material for use within the District. The requirements of Rule 441, ORGANIC SOLVENTS, 

shall not apply to persons using miscellaneous metal parts and products coatings, coating 

removers (strippers), surface preparation material, and cleanup materialoperations subject to 

this rule. 

103 SEVERABILITY: If any section, subsection, sentence, clause, phrase, or portion of this rule 

is, for any reason, held invalid, unconstitutional, or unenforceable by any court of competent 

jurisdiction, such portion shall be deemed as a separate, distinct, and independent provision, 

and such holding shall not affect the validity of the remaining portions thereof. 

110 EXEMPTION, LOW USAGE OF MATERIALS EXCEEDING VOC CONTENT LIMITS: The 

requirements of Section 301, 303, 305.35, and 305.47 shall not apply to the use of materials 

exceeding the VOC content limits specified in Sections 301, 303, 305.35, and 305.47 in a 

total volume less than 55 gallons per calendar year, per stationary source, provided the 

requirements in Section 401 and 501 are satisfied. 

111 EXEMPTION, OPERATIONS SUBJECT TO OTHER DISTRICT RULES: The requirements 

provisions of this rule shall do not apply to coatings, coating removers (strippers), surface 

preparation material, and cleanup material specifically subject to the requirements under the 

following rules: 

111.1 Coating of prefabricated architectural components or structures not coated in a shop 

environment which are regulated by Rule 442 -– Architectural 

Coatings.ARCHITECTURAL COATINGS; 

111.2 Motor vehicles including automotive, truck or heavy equipment finishing or 

refinishing, excluding radiators, drive trains, differentials, and engine components

which are regulated by Rule 459 -– Automotive, AUTOMOTIVE, TRUCK AND 

HEAVY EQUIPMENT REFINISHING OPERATIONS;Truck and Heavy Equipment 

Refinishing Operations.

111.3 Aircraft or aerospace vehicles, components and tooling which are regulated by Rule 

456 -– Aerospace Assembly and Component Coating OperationsAEROSPACE 

ASSEMBLY AND COMPONENT COATING OPERATIONS;. 

111.4 Cans, coils, or magnetic wire which are regulated by Rule 452 -– Can Coating.CAN 

COATING;

111.5 Adhesives and other materials which are regulated by Rule 460 -– Adhesives and 

Sealants.ADHESIVES AND SEALANTS; and

111.6 Conformal coatings which are regulated by Rule 456 -– Aerospace Assembly and 

Component Coating Operations.

112 EXEMPTION, SPECIFIC OPERATIONS AND COATINGS: Except for Sections 305.1, 

305.2, 305.58, and 501, the requirements of Sections 300, 400, and 500 shall not apply to: 

112.1 Magnetic data storage discs. 

112.2 Safety-indicating coatings. 

112.3 Stencil coatings. 

112.4 Any coating applied exclusively by hand lettering. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-4 October 28, 2010September 25, 2008

113 EXEMPTION, AEROSOL CONTAINERS: The requirementsprovisions of this rule shall not 

apply to coatings and coating removers (strippers) sold in non-refillable aerosol containers 

having a capacity of one liter (1.1 quarts) or less. 

114 EXEMPTION, APPLICATION EQUIPMENT: The requirements of Section 304 shall do not 

apply to the following:

114.1 Touch-up coating and repair coating operations. 

114.2 The application of texture coatings producing a textured finish. 

115 EXEMPTION, COATINGS FOR METAL FURNITURE: The requirements of Section 302 

shall not apply to metal furniture coating operations at a stationary source with actual 

emissions from such operations less than 3 tons of VOC per 12-month rolling period prior to 

emissions control equipment, provided that such operations comply with the requirements of 

Section 301.

116 EXEMPTION, AUTOMOBILE AND LIGHT-DUTY TRUCK ASSEMBLY COATING 

OPERATIONS: The requirements of this rule shall not apply to automobile and light-duty 

truck assembly coating operations.

200 DEFINITIONS

201 ADHESIVE: Any substance that is used to bond one surface to another surface by 

attachment. 

202 AEROSOL CONTAINER: A hand-held, non-refillable container which expels pressurized 

product ingredients by means of a propellant-induced force. 

203 AIR-DRIED COATING: Any coating which is not heated above 90o

C (194oF) for the purpose 

of curing or drying. 

204 ALUMINUM COATING FOR WINDOW FRAMES AND DOOR FRAMES: A coating which is 

applied in a shop environment and is used to protect prefabricated aluminum window frames, 

window walls, and door frames and which is required to meet the specifications of 

Architectural Aluminum Manufacturers Association AAMA 605.2-1980. 

205 APPLICATION EQUIPMENT: A device used to apply coatings or used in preparing a 

coating material such as stir sticks or funnels.

2065 APPURTENANCES: Accessories to a stationary structure, including, but not limited to: hand 

railings, cabinets, bathroom and kitchen fixtures, fences, rain-gutters and down-spouts, 

window screens, lamp-posts, heating and air conditioning equipment, other mechanical 

equipment, large fixed stationary tools and concrete forms. 

206 APPLICATION EQUIPMENT: A device used to apply coatings or used in preparing a 

coating material such as stir sticks or funnels.

207 AUTOMOBILE: A motor vehicle designed to carry up to eight passengers, excluding vans, 

sport utility vehicles, and motor vehicles designed primarily to transport light loads of 

property.

208 AUTOMOBILE AND LIGHT-DUTY TRUCK ASSEMBLY COATING OPERATIONS: A 

coating operation that includes the coatings of new automobile or new light-duty truck bodies, 

or body parts for new automobiles or new light-duty trucks and other parts that are coated 

along with these bodies or body parts at a facility where new automobiles or new light-duty 

trucks are completely assembled.
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-5 

2097 BAKED COATING: Any coating which is heated above 90o

C (194oF) for the purpose of 

curing or drying. 

2108 CAMOUFLAGE COATING: A coating applied as a topcoat on equipment to conceal such 

equipment from detection. 

21109 CLEANUP MATERIAL: A VOC-containing material used to clean parts and application 

equipment used in miscellaneous metal parts and products coating operations. 

2120 CLOSED CONTAINER: A container which has a cover where the cover meets with the main 

body of the container without any visible gaps between the cover and the main body of the 

container. 

2131 COATING: A material applied to a surface to identify, beautify, protect, convey a message, 

or minimize detection of such surface. 

2142 COATING REMOVER (STRIPPER): A material applied to the surface of any miscellaneous 

metal part or product to completely remove maskants, coatings (including mask coatings) or 

coating residues. A coating remover (stripper) is not a surface preparation material or 

cleanup material. Material used for the removal of overspray is not considered a coating 

remover. 

213 CONFORMAL COATING: A coating applied to electronic circuit boards or the assembled 

components for the purpose of moisture resistance, corrosion resistance, bacteria resistance, 

or fungi resistance.

2154 DIP COAT: A coating method which is applied by dipping an object into a vat of coating 

material and allowing any excess coating material to drain off. 

2165 ELECTRICAL INSULATING COATING: A non-convertible-type coating which is applied to 

electrical motors, components of electric motors, or power transformers expressly for the 

purpose of electrical insulation to provide electrical, mechanical, and environmental protection 

or resistance. 

2176 ELECTROSTATIC SPRAY: The spray application of coatings where an electrostatic 

potential is created between the part to be coated and the coating particles. 

217 ENCLOSED GUN CLEANER:

217.1 A device that is used for the cleaning of spray guns, pots, cups and hoses, that has 

an enclosed solvent container, is not open to the ambient air when in use, and has a 

mechanism to force the cleanup material through the gun while the cleaner is in 

operation; or

217.2 A device that is used for the cleaning of spray guns, pots, cups and hoses, that has 

an enclosed solvent container, uses non-atomized solvent flow to flush the spray 

equipment and collects and returns the discharged solvent to the enclosed container.

218 END USER: Any person applying any coating, coating remover (stripper), surface 

preparation material, or cleanup material subject to this rule.

219 ETCHING FILLER: A coating which contains at least 1⁄2 percent acid by weight, as 

determined by the method specified in Section 502.2, and less than 23 percent solids by 

weight, as determined by the method specified in Section 502.7, and is used instead of 

applying a pretreatment wash primer followed by a primer. 

22019 EXEMPT COMPOUND: For the purposes of this rule, “exempt compound” has the same 

meaning as in Rule 101-GENERAL PROVISIONS AND DEFINITIONS. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-6 October 28, 2010September 25, 2008

2210 EXTREME HIGH GLOSS COATING: A coating which, when tested by American Society for 

Testing Materials test method D-523 adopted in 20081980, shows at least 75% reflectance 

on a 60o meter. 

2221 EXTREME PERFORMANCE COATING: A coating that is used on a metal surface where 

the coated surface, in it’s intended use, is acutely or chronically exposed to salt water, 

corrosives, caustics, acids, oxidizing agents, wind or ocean driven debris or electromagnetic 

pulse. 

2232 FLOW COAT: A coating method which is applied by flowing a stream of coating over an 

object and allowing any excess coating material to drain off. 

2243 HAND APPLICATION EQUIPMENT: Manually held equipment such as brushes, rollers, 

trowels, spatulas, daubers, rags, sponges, and mechanically or pneumatically driven syringes 

that do not atomize the applied products. 

2254 HAND LETTERING: A method utilizing hand application equipment to add letters and/or 

numbers on a substrate. 

2265 HEAT RESISTANT COATING: A coating used on a metal surface where the coated surface 

must withstand a temperature of at least 400 o

F during normal use. 

2276 HIGH-VOLUME LOW-PRESSURE APPLICATION EQUIPMENT: Equipment used to apply 

coatings by means of a gun which is designed to be operated and which is operated between 

0.1 and 10 psig air pressure measured dynamically at the center of the air cap and at the air 

horns. 

2287 LOW-VOLUME LOW-PRESSURE APPLICATION EQUIPMENT: Spray coating application 

equipment with air pressure between 0.1 and 10.0 pounds per square inch gauge (psig) and 

air volume less than 15.5 cfm per spray gun and which operates at a maximum fluid delivery 

pressure of 50 psig. 

229 LIGHT-DUTY TRUCK: A van, sport utility vehicle, or motor vehicle designed to transport 

light loads of property with gross vehicle weight rating of 8,500 pounds or less.

23028 MAGNETIC DATA STORAGE DISC: A flat film or plate with a magnetic coating on which 

digital information can be stored by selective magnetization of portions of the flat surface. 

231 MASK COATING: A thin film coating applied through a template to coat a small portion of 

the substrate.

23229 METAL FURNITURE: Furniture and components of furniture including, but not limited to, the 

following types of products: household, office, institutional, laboratory, hospital, public 

building, restaurant, barber and beauty shop, and dental furniture; and office and store 

fixtures, partitions, shelving, lockers, lamps and lighting fixtures, and wastebaskets. 

2330 METALLIC/IRIDESCENT COATING: Any coating which contains more than 5.0 g/l (0.042 

lb/gal) of metal or iridescent particles, as applied, where such particles are visible in the dried 

film. 

2341 MISCELLANEOUS METAL PARTS AND PRODUCTS: Any metal parts andor products

except for those specified in Sections 111, and 112., and 116.

2352 MULTI-COMPONENT COATING: A coating requiring the addition of a separate reactive 

resin, commonly known as a catalyst or hardener, before application to form an acceptable 

dry film. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-7 

2363 NON-COMPLIANT COATINGMATERIAL: A coating, coating remover, cleanup material, or 

surface preparation material that exceeds the VOC content limits specified in Section 301, 

303, 305.35, or 305.47 and the usage is in excess of allowable volumes per Section 110. 

2374 NON-SKID COATING: Any coating which has, as its primary purpose, the creation of 

traction to prevent slippage. (This definition will sunset on (six months after date of 

adoption)).

2385 PREFABRICATED ARCHITECTURAL COMPONENT: Prefabricated metal parts and 

products which are to be used as architectural appurtenances or structures and which are 

coated in a shop environment, not including window frames and door frames. 

2396 PRETREATMENT WASH PRIMER: A coating which contains at least 1⁄2 percent acid by 

weight, as determined by the method specified in Section 502.2, and no more than 12 

percent solids by weight, as determined by the method specified in Section 502.7, and is 

applied directly to metal surfaces to provide surface etching and corrosion resistance or 

adhesion of subsequent coatings. A Pretreatment Wash Primer is not a Surface Preparation 

Material as defined in Section 2485. 

24037 REPAIR COATING: A coating used to recoat portions of a previously coated part or product 

which has sustained mechanical damage to the coating following normal coating operations. 

24138 ROLL COATER: A series of mechanical rollers that forms a thin coating film on the surface 

of the roller, which is applied to a substrate by moving the substrate underneath the roller. 

24239 SAFETY-INDICATING COATING: A coating which is designed to have a color change when 

it is exposed to an unsafe condition such as a high temperature or an unsafe concentration of 

gas. 

2430 SHOP ENVIRONMENT: A commercial, governmental, or educational stationary source 

where coatings are applied, excluding those locations at which coatings subject to Rule 442, 

Architectural Coatings, are applied. 

2441 SILICONE RELEASE COATING: A coating which contains silicone resin and is intended to 

prevent a substance from sticking to metal surfaces such as baking pans. 

2452 SOLAR ABSORBENT COATING: A coating which has, as its primary purpose, the 

absorption of solar radiation. 

2463 STATIONARY SOURCE: Any building, structure, facility, or emissions unit which emits or 

may emit any affected pollutant directly or as a fugitive emission. 

2463.1 Building, structure, facility, or emissions unit includes all pollutant emitting activities 

which: 

a. Belong to the same industrial grouping, and 

b. Are located on one property, or two or more contiguous properties, and 

c. Are under the same or common ownership, operation, or control, or which 

are owned or operated by entities which are under common control. 

2463.2 Pollutant emitting activities shall be considered as part of the same industrial 

grouping if: 

a. They belong to the same two-digit Standard Industrial Classification (SIC) 

code, or 

b. They are part of a common production process, which includes industrial 

processes, manufacturing processes and any connected processes 

involving a common material. 

2474 STENCIL COATING: An ink or a coating which is applied by a template or stamp in order to 

add designs, letters and/or numbers to the a part or product. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-8 October 28, 2010September 25, 2008

2485 SURFACE PREPARATION MATERIAL: A VOC containing material applied to the surface 

of any miscellaneous metal part or product prior to the application of coatings to clean the 

substrate or to promote adhesion of subsequent coatings. 

2496 TEXTURED FINISH COATING: A coating that, when applied, consists of discrete raised 

spots and is used for decorative or functional purposesA rough surface produced by spraying 

large drops of coating onto a substrate or previously applied coating. 

25047 TOUCH-UP COATING: A coating used to cover minor coating imperfections appearing after 

the main coating operation. 

25148 VOLATILE ORGANIC COMPOUND (VOC): For the purposes of this rule, “volatile organic 

compound” has the same meaning as in Rule 101-GENERAL PROVISIONS AND 

DEFINITIONS. 

25249 VOLATILE ORGANIC COMPOUND (VOC) AS APPLIED: For the purpose of this rule, VOC 

as applied means the VOC content including thinners, reducers, hardeners, retarders, 

catalysts and additives calculated pursuant to Sections 403 or 404 as applicable. 

300 STANDARDS

301 VOC CONTENT OF COATINGS FOR MISCELLANEOUS METAL PARTS AND 

PRODUCTS: Except as provided in Sections 110, 111, 112, 113, or 306, a person shall not 

apply to any miscellaneous metal part or product any coating that exceeds the following VOC 

content limits as applied. The VOC content of the coating shall be determined pursuant to 

Section 502.1. 

VOC CONTENT: Grams/Liter (Lbs/Gal) 

less water and exempt compounds

COATING CATEGORY AIR DRIED BAKED 

Aluminum Coating for Window 

Frames and Door Frames 420 (3.5) 

420 (3.5)

[Effective (six months 

after date of adoption), 

275 (2.3)]

Camouflage 420 (3.5) 360 (3.0) 

Electrical Insulating 340 (2.8) 275 (2.3) 

Etching Filler 420 (3.5) 420 (3.5)

Extreme High Gloss 420 (3.5) 360 (3.0) 

Extreme Performance 420 (3.5) 

420 (3.5)

[Effective (six months 

after date of adoption), 

360 (3.0)]

Heat Resistant 420 (3.5) 360 (3.0) 

Metallic/Iridescent 420 (3.5) 420 (3.5) 

Non-Skid

This category will sunset on (six 

months after date of adoption) 

and be subject to the limits for All 

Other Coatings

420 (3.5) 360 (3.0) 

Prefabricated Architectural 

Component 420 (3.5) 275 (2.3) 

Pretreatment Wash Primer 420 (3.5) 420 (3.5) 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-9 

Silicone Release Coating 420 (3.5) 420 (3.5) 

Solar Absorbent 420 (3.5) 360 (3.0) 

All Other Coatings 340 (2.8) 275 (2.3) 

302 VOC CONTENT OF COATINGS FOR METAL FURNITURE: Effective September 25, 2009,

eExcept as provided in Sections 111, 112, 113, 115, or 306, a person shall not apply to metal 

furniture any coating that exceeds the following VOC content limits as applied. The VOC 

content of the coating shall be determined pursuant to Section 502.1. 

VOC CONTENT: Grams/Liter (Lbs/Gal) 

less water and exempt compounds 

COATING CATEGORY AIR DRIED BAKED

General, Multi-Component 340 (2.8) 275 (2.3) 

Etching Filler 420 (3.5) 420(3.5)

Extreme High Gloss 340 (2.8) 360 (3.0) 

Extreme Performance 420 (3.5) 360 (3.0) 

Heat Resistant 420 (3.5) 360 (3.0) 

Metallic/Iridescent 420 (3.5) 420 (3.5) 

Pretreatment Wash Primer 420 (3.5) 420 (3.5) 

Solar Absorbent 420 (3.5) 360 (3.0) 

All Other Coatings 275 (2.3) 275 (2.3) 

303 VOC CONTENT FOR COATING REMOVERS (STRIPPERS): A person shall not use a 

stripper on miscellaneous metal parts and products which contains more than 200 grams of 

VOC per liter of material (1.7 pounds per gallon). 

304 APPLICATION EQUIPMENT REQUIREMENTS: A person shall not apply to any 

miscellaneous metal part or product any coating unless one of the following application 

methods is used: 

304.1 Roll Coater 

304.2 Dip Coat 

304.3 Electrostatic Spray 

304.4 Flow Coat 

304.5 High-Volume Low-Pressure (HVLP) Application Equipment 

304.6 Low-Volume Low-Pressure (LVLP) Application Equipment 

304.7 Hand Application Equipment, such as brush or roller 

304.8 Any other equivalent method which has been approved in writing by the Air Pollution 

Control Officer and the U.S. Environmental Protection Agency 

305 SURFACE PREPARATION, CLEANUP, AND STORAGE REQUIREMENTS: Any person 

subject to this rule shall comply with the following requirements: 

305.1 Closed containers shall be used for the disposal of cloth, paper, or sponges used for 

surface preparation, cleanup, coating application and coating removal. 

305.2 VOC-containing materials shall be stored in containers, which are closed when not in 

use, shall be disposed of in a manner that the VOC are not emitted into the 

atmosphere, and shall be conveyed from one location to another in closed containers 

or through pipes. 

305.3 Prior to September 25, 2009, except for electrostatic spray guns, a person shall not 

use VOC-containing materials for the cleanup of application equipment used in 

miscellaneous metal parts and products coating operations, unless the equipment is 

cleaned in an enclosed gun cleaner, or the VOC content of the material used does 

not exceed 72 grams per liter (0.6 pounds per gallon).

305.4 Prior to September 25, 2009, spray gun nozzles only, may be soaked in solventbased materials for cleaning, provided the container (not to exceed five (5) gallons in 

size) is kept tightly covered at all times except when accessing the container.
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-10 October 28, 2010September 25, 2008

305.5 Prior to September 25, 2009, a person shall not perform product cleaning or surface 

preparation with a material containing VOC in excess of 72 grams per liter (0.6 

pounds per gallon).

305.36 Effective September 25, 2009, a A person shall not perform cleanup of application 

equipment (including spray gun nozzles) with a material containing VOC in excess of 

25 grams per liter (0.21 pounds per gallon). 

305.47 Effective September 25, 2009, a A person shall not perform product cleaning or 

surface preparation with a material containing VOC in excess of 25 grams per liter 

(0.21 pounds per gallon). 

305.58 Spillage of VOC-containing materials shall be minimized.

306 EMISSION CONTROL SYSTEM REQUIREMENTS: As an alternative to Sections 301, 302, 

303, 305.3, and 305.45, 305.6, and 305.7, a person may use air pollution control equipment 

subject to the approval of the Air Pollution Control Officer that provides an overall system 

efficiency, as determined by Section 406, of not less than 90%. 

400 ADMINISTRATIVE REQUIREMENTS

401 LOW USAGE EXEMPTION SUBMITTAL: The total previous calendar year usage records, 

as specified in Section 501.3a(3), for all coatings, coating removers, surface preparation and 

cleanup materials exceeding the VOC limits specified in Sections 301, 303, 305.53, and 

305.74 shall be submitted annually to the Air Pollution Control Officer by January 31. 

402 PRODUCT INFORMATION REQUIREMENTS FOR SELLERS: Any person who sells any 

coating, coating remover (stripper), surface preparation or cleanup material subject to this 

rule shall provide the following information on material data sheets made available to the 

purchaser at the time of sale: 

402.1 The material type by name/code/manufacturer 

402.2 For coating material, the maximum VOC content of the material, as applied, after any 

mixing or thinning as recommended by the manufacturer. VOC content shall be 

displayed as grams of VOC per liter of coating (or pounds of VOC per gallon), 

excluding water and exempt compounds, pursuant to Section 403. 

402.3 For coating removers (strippers), surface preparation and cleanup material, the 

maximum VOC content of the material, as applied, after any mixing or thinning as 

recommended by the manufacturer. VOC content shall be displayed as grams of 

VOC per liter of coating (or pounds of VOC per gallon), including water and exempt 

compounds, pursuant to Section 404. 

402.4 For all material, recommendations regarding thinning, reducing, or mixing with any 

VOC containing material, as defined in Section 25148. 

402.5 For all material, VOC content may be calculated using product formulation data, or 

may be determined using the test method in Section 502.1. 

403 CALCULATION FOR DETERMINING VOC CONTENT OF COATINGS, LESS WATER AND 

EXEMPT COMPOUNDS: The volume of coating material is defined as the volume of the 

original coating plus any VOC-containing material added to the original coating. The weight 

of VOC per combined volume of VOC and coating solids shall be calculated by the following 

equation; 

( )

( ) m W EC

v w ec

V V V

W W W G − −

− − 1 =

Where: G1 = Weight of VOC per total volume of coating, less water and 

exempt compounds, in grams per liter 

Wv = Weight of all volatile compounds including any volatile 

materials added to the original coating supplied by the 

manufacturer, in grams 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-11 

Ww = Weight of water, in grams 

Wec = Weight of exempt compounds as listed in Section 22019, in 

grams 

Vm = Volume of coating material, in liters 

Vw = Volume of water, in liters 

Vec = Volume of exempt compounds as listed in Section 22019, 

in liters 

404 CALCULATION FOR DETERMINING VOC CONTENT OF COATING REMOVERS 

(STRIPPERS) AND SURFACE PREPARATION AND CLEANUP MATERIAL: The volume 

of material is defined as the volume of the original material, plus any VOC-containing material 

added to the original material. The weight of VOC per total volume of material shall be 

calculated by the following equation; 

( )

m

v w ec

V

W W W G − − 1 =

Where: G1 = Weight of VOC per total volume of material, in grams per 

liter 

Wv = Weight of all volatile compounds, in grams 

Ww = Weight of water, in grams 

Wec = Weight of exempt compounds as listed in Section 22019, in 

grams 

Vm = Volume of material, in liters 

405 CALCULATION FOR DETERMINING PERCENT CONTROL EFFICIENCY AND VOC 

MASS EMISSION RATE: The VOC mass emission rate shall be calculated both upstream 

and downstream of the emissions control device based on the respective VOC mass 

concentration and volumetric flowrate, pursuant to Section 502.4 and the following equation: 

M = (Q)(C)(60min/ hr)

Where: M = VOC mass emission rate, in lb/hr. 

Q = the volumetric flowrate of the exhaust stack, in scfm. 

C = the VOC mass concentration, in lb/scf, as measured by 

EPA Method 25. 

The percent control efficiency is calculated as follows: 

%CE = [(M U – M D) / M U] X 100 

Where: CE = control efficiency. 

MU = the upstream VOC mass emission rate, in lb/hr. 

MD = the downstream VOC mass emission rate, in lb/hr. 

406 CALCULATION FOR DETERMINING OVERALL SYSTEM EFFICIENCY: The overall 

system efficiency is calculated as follows: 

%SE = [%CLE X %CE] / 100

Where: SE = system efficiency. 

CLE = collection efficiency, as determined by Section 502.3 

CE = control efficiency, as determined by 502.4 

407 OPERATION AND MAINTENANCE PLAN: Any person using an approved emission control 

device pursuant to Section 306 as a means of complying with this rule, as provided in 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-12 October 28, 2010September 25, 2008

Sections 301, 302, 303, 305.3, 305.5, 305.6, and 305.47 must submit, with the application for 

Authority to Construct, pursuant to Rule 201, General Permit Requirements, an Operation 

and Maintenance Plan for the emission control device to the Air Pollution Control Officer for 

approval. The Plan shall specify operation and maintenance procedures which will 

demonstrate continuous operation of the emission control device during periods of emissionsproducing operations. The Plan shall also specify which records must be kept to document 

these operation and maintenance procedures. These records shall comply with the 

requirements of Sections 501.4 and 501.5. The Plan shall be implemented upon approval of 

the Air Pollution Control Officer. 

500 MONITORING AND RECORDS

501 RECORDKEEPING FOR END USERS: In addition to any existing permit conditions issued 

pursuant to Rule 201, any person within the District subject to this rule, including operations 

claiming exemption under Sections 110, and 112, and 115, shall comply with the following 

requirements: 

501.1 LIST OF MATERIALS: A list shall be maintained of currently used coatings, coating 

removers (strippers), surface preparation materials, cleanup materials, and other 

VOC containing materials including, but not limited to thinners, reducers, hardeners, 

retarders, catalysts, etc . The list shall contain all such materials that are currently 

used and stored on site and shall include the following information: 

a. The material type by name/code/manufacturer and the appropriate category 

as designated by the coating categories or other material categories in 

Sections 301, 302, 303, 305, or “exempt”, as specified by Sections 111 and 

112, as applicable. 

b. The actual VOC content of the material, as applied, pursuant to Section 

25249. VOC content as provided by the manufacturer, pursuant to Section 

402 is acceptable, if following manufacturer’s recommended mix ratio. 

c. The actual mixing ratio used for the material, as applied. 

d. The substrate to which the material is applied. 

e. Identification of each material type exceeding the VOC limits specified in 

Sections 301, 303, 305.35, and 305.47. 

501.2 PRODUCT INFORMATION: A data sheet applicable to each material type shall be 

maintained on site and made available to the Air Pollution Control Officer on request. 

 The data sheet shall be provided by the supplier to the end user, pursuant to 

Section 402, and shall include the following information: 

a. The material type by name/code/manufacturer 

b. For coating material: the maximum VOC content of the coating material, as 

applied, after any mixing or thinning as recommended by the manufacturer. 

VOC content shall be displayed as grams of VOC per liter of coating (or 

pounds of VOC per gallon), excluding water and exempt compounds, 

pursuant to Section 403. 

c. For coating removers (strippers), surface preparation and cleanup material: 

the maximum VOC content of the material, as applied, after any mixing or 

thinning as recommended by the manufacturer. VOC content shall be 

displayed as grams of VOC per liter of coating (or pounds of VOC per 

gallon), including water and exempt compounds, pursuant to Section 404. 

d. For all material, recommendations regarding thinning, reducing, or mixing 

with any VOC containing material, as defined in Section 25148. 

e. For all material, VOC content may be calculated using product formulation 

data, or may be determined using the test method in Section 502.1. 

501.3 USAGE RECORDS: Any person within the District using materials regulated by this 

rule shall update and maintain the records as follows: 

a. Monthly: 

1. Records of total applied volume for each coating, coating remover 

(stripper), surface preparation and cleanup material, specified by 

category as listed in Sections 301, 302, 303, and 305. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25 , 2008October 28, 2010 451-13 

2. The method of application, specified by coating category or other 

material category as listed in Sections 301, 302, and 303 including 

a designation for touch-up and repair operations, as applicable. 

3. Records of total applied volume for each material type exceeding 

the VOC limits specified in Sections 301, 303, 305.35, and 305.47

by name/code/manufacturer and coating category. 

b. Daily: 

1. If, pursuant to Section 306, an emission control device is used as a 

means of complying with this rule, records of the material type by 

name/code/manufacturer and the total applied volume of each 

material. 

2. For non-compliant coatingsmaterials, as defined in Section 2363, 

records regarding the use, including the lack of use, of each 

material type by name/code/manufacturer and the total applied 

volume of each material. 

501.4 CONTROL EQUIPMENT: Any person using an emission control device pursuant to 

Section 306 as a means of complying with this rule shall maintain such records as 

required by the Operation and Maintenance Plan in Section 407 on a daily basis. 

501.5 DURATION OF RECORDS: 

a. Prior to September 25, 2010, such records shall be maintained on-site for 

three years and made available for review by the Air Pollution Control 

Officer upon request.

b. Effective September 25, 2010, sSuch records shall be maintained on-site for 

five years and made available for review by the Air Pollution Control Officer 

upon request. 

502 TESTING PROCEDURES:

502.1 DETERMINATION OF VOC CONTENT: VOC content of coatings, coating removers 

(strippers), and surface preparation and cleanup material shall be determined using 

EPA Reference method 24 and Sections 403 and 404 of this rule and Section 502.5 

of this rule. 

502.2 DETERMINATION OF ACID CONTENT: Measurement of acid content shall be 

determined in accordance with ASTM D 1613-06. 

502.3 DETERMINATION OF COLLECTION EFFICIENCY: Collection efficiency shall be 

determined in accordance with the U.S. EPA technical guideline document, 

“Guidelines for Determining Capture Efficiency,” dated January 9, 1995. Individual 

capture efficiency test runs subject to U.S. EPA technical guidelines shall be 

determined by: 

a. Applicable U.S. EPA methods 204, 204A, 204B, 204C, 204D, 204E, and/or 

204F; or 

b. Any other method approved by the U.S. EPA, the California Air Resources 

Board, and the Air Pollution Control Officer. 

502.4 DETERMINATION OF CONTROL EFFICIENCY: Efficiency of control equipment 

shall be determined in accordance with EPA Method 18, 25, 25A, EPA Method 2 or 

2C (whichever is applicable), and Section 405. 

502.5 DETERMINATION OF COMPOUNDS EXEMPT FROM VOC DEFINITION: 

Compounds exempted from VOC definition, as listed in Section 22017, shall be 

determined in accordance with ASTM D 4457-02 (2008) or ARB Method 432. If any 

of the perfluorocarbons are being claimed as exempt compounds, the person making 

the claim must state in advance which compounds are present, and the EPAapproved test method used to make the determination of these compounds. 

502.6 DETERMINATION OF METAL CONTENT: Measurement of metal content shall be 

conducted and reported in accordance with the South Coast Air Quality Management 

District's Method 318, “Determination of Weight Percent Elemental Metals in 

Coatings by X-ray Diffraction”.

502.7 DETERMINATION OF SOLIDS CONTENT: Solids content of coatings shall be 

determined using EPA Reference method 24. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

451-14 October 28, 2010September 25, 2008

502.87 MULTIPLE TEST METHODS: When more than one test method or set of test 

methods is 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 this rule.