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RULE 4610 GLASS COATING OPERATIONS (Adopted May 16, 2002; Amended 

December 19, 2002; Amended April 17, 2003) 

1.0 Purpose 

The purpose of this rule is to limit the emissions of volatile organic compounds (VOCs) 

from the coating of glass products. 

2.0 Applicability 

The requirements of this rule shall apply to any major source that coats glass products 

with VOC-containing materials. 

3.0 Definitions 

3.1 Aerosol Coating Product: any pressurized coating product containing pigments 

or resins that dispenses product ingredients by means of a propellant, and is 

packaged in a disposable can for hand-held application. 

3.2 Clear Coating: a colorless coating, which contains binders, but no pigment, and 

is formulated to form transparent film. 

3.3 Coating: a material applied onto or impregnated into a substrate for protective, 

decorative, or functional purposes. Such materials include, but are not limited 

to, paints, varnishes, sealers, and stains. 

3.4 Coating Application Equipment: any equipment used to apply coating to a 

substrate. Coating application equipment includes coating distribution lines, 

coating hoses, pressure-pots, spray guns, and hand-application equipment. 

3.5 Curtain/Flow Coater: a type of coating application equipment that coats an 

object by flowing a stream of coating over the object and draining off any excess 

coating. 

3.6 Dip Coater: a type of application equipment that coats an object by submerging 

the object in a vat of coating, and subsequently withdrawing the object and 

draining off the excess coating. 

3.7 Electric Dissipating Coating: a coating that rapidly dissipates a high-voltage 

electric charge. 

3.8 Electrostatic Application: a method of applying coating whereby atomized paint 

droplets are charged and subsequently deposited on the substrate by electrostatic 

attraction. 
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3.9 Grams Of VOC Per Liter Of Coating, Less Water and Less Exempt 

Compounds: a weight of VOC per combined volume of VOC and coating solids 

and can be calculated by the following equation: 

Grams of VOC per Liter of Coating, 

Less Water and Less Exempt Compounds = Ws - Ww - Wec

Vm - Vw - Vec 

Where: 

Ws = weight of volatile compounds in grams 

Ww = weight of water in grams 

Wec = weight of exempt compounds in grams 

Vm = volume of material in liters 

Vw = volume of water in liters 

Vec = volume of exempt compounds in liters 

3.10 Hand Application Methods: any method used to apply coating to substrate by 

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

paint brushes, hand rollers, caulking guns, trowels, spatulas, syringe daubers, 

rags, and sponges. 

3.11 High-Volume, Low-Pressure (HVLP) Spray: a coating application system 

which is operated at air pressure between 0.1 and 10.0 pounds per square inch 

gauge (psig). 

3.12 Ink: a fluid that contains dyes and/or colorants, and is used to make markings 

but not to protect surfaces. 

3.13 Major Source: as defined in Rule 2201 (New and Modified Stationary Source 

Review Rule). 

3.14 Metallic Coating: a coating, which contains more than 5 grams of metal 

particles per liter of coating as applied. 

3.15 Metal Particles: any pieces of a pure elemental metal or a combination of 

elemental metals. 

3.16 Mirror Backing: a coating applied over the silvered surface of a mirror. 

3.17 One-component Coating: a coating that is ready for application as it comes out 

of its container to form an acceptable dry film. A thinner necessary to reduce 

the viscosity is not considered a component. 

3.18 Optical Coating: a coating applied to an optical lens. 
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3.19 Permanent Total Enclosure (PTE): a permanently installed enclosure that 

completely surrounds a source of emissions such that all VOC emissions are 

captured and contained for discharge to a control device. 

3.20 Repair Coating: a coating used to re-coat portions of a previously coated 

product, which has sustained mechanical damage to the coating following 

normal coating operations. 

3.21 Roll Coater: a type of coating application equipment that utilizes a series of 

mechanical rollers to form a thin coating film on the surface of a roller, which is 

then applied to a substrate by moving the substrate underneath the roller. 

3.22 Shock-Free Coating: a coating applied to electrical components to protect the 

user from electric shock. The coating has characteristics of being of low 

capacitance and high resistance, and having resistance to breaking down under 

high voltage. 

3.23 Stencil Coating: an ink or a coating which is rolled or brushed onto a template 

or stamp in order to add identifying letters and/or numbers. 

3.24 Touch-up Coating: a coating used to cover minor imperfections appearing after 

the main coating operation. 

3.25 Translucent Coating: a coating, which contains binders and pigment, and is 

formulated to form a colored, but not opaque, film. 

3.26 Two-component Coating: a coating requiring the addition of a separate reactive 

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

dry film. 

3.27 Volatile Organic Compound (VOC): as defined in Rule 1020 (Definitions). 

4.0 Exemptions 

The provisions of this rule shall not apply to the following: 

4.1 Touch-up and repair coatings; 

4.2 Stencil coatings applied on clear or transparent substrates; 

4.3 Coatings applied at a paint manufacturing facility while conducting performance 

tests on the coatings; and 

4.4 Aerosol coating products. 
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5.0 Requirements 

5.1 VOC Content Limits for Coatings 

A person shall not apply on glass any coating, which exceeds the VOC content 

limit specified below: 

VOC CONTENT LIMITS 

Less Water and Less Exempt Compounds 

Effective on and after 12/1/2002 COATING 

g/L lb/gal 

 General Coatings 

One-component 275 2.3 

Two-component 420 3.5 

 Mirror Backing 

Curtain Coated 500 4.2 

Roll Coated 430 3.6 

 Other Coatings 

Optical Coatings 800 6.7 

Electric Dissipating Coatings 

and Shock-Free Coatings 360 3.0 

Metallic Coatings 420 3.5 

5.2 Prohibition of Specification 

A person shall not specify the use, in the District, of any coating to be applied 

to any glass subject to the provisions of this rule that does not meet the limits 

and requirements of this rule. The requirements of this paragraph shall apply to 

all written or oral contracts. 

5.3 Solvent Cleaning, Storage, and Disposal 

Solvent cleaning operations and the storage and disposal of VOC-containing 

materials are subject to the provisions of Rule 4663 (Organic Solvent Cleaning, 

Storage and Disposal). 

5.4 Application Equipment Requirements 

A person shall not apply coatings unless the coating is applied with equipment 

operated according to the manufacturer's specifications, and by the use of one of 

the following methods: 

5.4.1 electrostatic application; or 
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5.4.2 curtain/flow coater; or 

5.4.3 roll coater; or 

5.4.4 dip coater; or 

5.4.5 hand application methods; or 

5.4.6 high-volume, low-pressure (HVLP) spray. 

5.5 VOC Emission Control Equipment 

5.5.1 Except for mirror backing operations, a person may comply with the 

provisions in Sections 5.1 and 5.4 by using an APCO approved VOC 

emission control equipment, provided that the owner/operator 

demonstrates compliance with the following provisions: 

5.5.1.1 The emission collection system has a capture efficiency of at 

least 90 percent of the VOC emissions generated by the sources 

of emissions and the control device reduces VOC emissions 

from the emission collection system by at least 95 percent, or 

5.5.1.2 The VOC emission reduction system meets the requirements of 

Section 5.5.2.1 and Section 5.5.2.2. 

5.5.2 VOC Emission Reductions – Mirror Backing Operations 

In addition to the applicable requirements of Section 5.1, effective on 

and after July 1, 2004, a person performing mirror backing operations 

shall comply with the following requirements: 

5.5.2.1 Reduce VOC emissions from operations such that emissions do 

not exceed 10 percent of the emissions which would result from 

compliance with Section 5.1 requirements, and 

5.5.2.2 The VOC emission reduction system is approved by the APCO. 

6.0 Administrative Requirements 

6.1 Recordkeeping 

6.1.1 Any person subject to the requirements of Section 5.0 of this rule shall 

maintain records which show on a daily basis, the following information: 
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6.1.1.1 type of coating; 

6.1.1.2 the VOC content of each coating, as applied, less water and 

exempt compounds; 

6.1.1.3 the specific mixing ratio for the coating, hardeners, catalysts, 

solvents, diluents, and thinners, if applicable; 

6.1.1.4 the method of application and substrate type; 

6.1.1.5 oven temperature (for coating operations), if applicable, and 

6.1.1.6 other information, as specified by the APCO, necessary to verify 

compliance with the applicable requirements of this rule. 

6.1.2 Records of disposed waste solvent or waste solvent residues shall be kept 

in accordance with Rule 4663. 

6.1.3 Records shall be maintained on-site for a minimum of five years and made 

available for inspection to the APCO upon request. 

6.1.4 Any person using an add-on emission control system shall maintain daily 

records of key system operating parameters and maintenance procedures 

which will demonstrate continuous operation and compliance of the 

emission control system during periods of emission producing activities. 

Key system operating parameters are those necessary to ensure compliance 

with the emission reduction, capture efficiency, control efficiency and 

overall capture and control efficiency requirements of this rule. The 

parameters may include, but are not limited to, temperatures, pressures, 

and flow rates. 

6.2 Test Methods 

6.2.1 Determination of VOC Content 

The VOC content of materials subject to the provisions of this rule shall 

be determined by the following United States Environmental Protection 

Agency (EPA) Test Methods or any other method approved by EPA, the 

California Air Resources Board (ARB), and the APCO: 

6.2.1.1 EPA Test Method 24 (Determination of Volatile Matter 

Content, Water Content, Density, Volume Solids, and Weight 

Solids of Surface Coatings, Code of Federal Regulations Title 

40, Part 60, Appendix A). 
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6.2.1.2 Exempt compounds’ VOC content shall be determined by 

SCAQMD Method 303 (Determination of Exempt Compounds) 

contained in the SCAQMD "Laboratory Methods of Analysis 

for Enforcement Samples" manual. 

6.2.2 Determination of Capture Efficiency of an Emission Control System 

The capture efficiency of an emission collection control system shall be 

determined according to EPA’s “Guidelines for Determining Capture 

Efficiency,” January 9, 1995 and 40 CFR 51, Appendix M, Methods 

204-204F, as applicable, noted below or any other method approved by 

EPA, ARB, and the APCO: 

6.2.2.1 EPA Method 204A (VOCs in Liquid Input Stream), 

6.2.2.2 EPA Method 204B (VOCs in Captured Stream), 

6.2.2.3 EPA Method 204C (VOCs in Captured Stream Dilution 

Technique), 

6.2.2.4 EPA Method 204D (Fugitive VOCs from Temporary Total 

Enclosure), 

6.2.2.5 EPA Method 204E (Fugitive VOCs from Building Enclosure), 

6.2.2.6 EPA Method 204F (VOCs in Liquid Input Stream Distillation), 

and 

6.2.2.7 EPA Method 204 (Criteria For And Verification Of A 

Permanent or Temporary Total Enclosure). 

6.2.3 Determination of Control Efficiency of Emission Control System 

The efficiency of the control device of an emission control system shall 

be determined by using EPA Methods 2, 2A, or 2D for measuring flow 

rates and EPA Test Method 25, or 25A for measuring total gaseous 

organic concentrations at the inlet and outlet of the control device. EPA 

Test Method 18 or ARB Method 422 shall be used to determine 

emissions of exempt compounds. 

6.2.4 Determination of Overall Capture and Control Efficiency of Emission 

Control System 

The overall capture and control efficiency shall be calculated by using 

the following equation: 
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CECAPTURE AND CONTROL = [ CECAPTURE x CECONTROL ] / 100 % 

Where: 

CECAPTURE AND CONTROL = Overall Capture and Control Efficiency, in 

percent 

CECAPTURE = Capture Efficiency of the collection device, 

in percent, as determined in Section 6.2.2 

CECONTROL = Control Efficiency of the control device, in 

percent, as determined in Section 6.2.3. 

6.2.5 Multiple Test Methods 

VOC emissions, VOC content, capture efficiency, control efficiency, and 

overall capture and control efficiency determined to exceed any limits 

established by this rule through the use of any of the above-referenced 

test methods or equations shall constitute a violation of the rule. 

6.3 VOC Emission Control Equipment – Testing Requirements 

The collection and control devices of an emission control system shall comply 

with the following testing requirements: 

6.3.1 A collection device that is not a PTE shall be source tested on an annual 

basis to determine the collection efficiency of the collection device. 

6.3.2 A collection device that is a PTE shall be source tested initially to 

validate that it meets the requirements of a PTE pursuant to EPA Method 

204. 

6.3.3 A control device shall be source tested on an annual basis to determine 

the control efficiency of the control device.