SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT
(Adopted July 6, 1979)(Amended May 7, 1982)(Amended Jan. 6, 1984)
(Amended June 1, 1984)(Amended Jan. 9, 1987)(Amended Feb. 6, 1987)
(Amended April 3, 1987)(Amended May 5, 1989)(Amended March 2, 1990)
(Amended April 6, 1990)(Amended June 1, 1990)(Amended Nov. 2, 1990)
(Amended Dec. 7, 1990)(Amended August 2, 1991)(Amended March 6, 1992)
(Amended Dec. 4, 1992)(Amended Dec. 10, 1993)(Amended Jan. 13, 1995) (Amended Dec. 13, 1996)
RULE 1124. - AEROSPACE ASSEMBLY AND COMPONENT MANUFACTURING OPERATIONS
(a) Purpose and Applicability
The purpose of Rule 1124 is to reduce volatile organic compounds (VOC) emissions from aircraft and spacecraft coating,
assembly and cleaning operations. This rule applies to any operation associated with manufacturing and assembling
products for aircraft and space vehicles. The affected industries include commercial and military aircraft, satellite,
space shuttle and rocket manufacturers and their subcontractors. The rule also applies to maskant applicators,
aircraft refinishers, aircraft fastener manufacturers, aircraft operators, and aircraft maintenance and service
facilities.
(b) Definitions
For the purpose of this rule, the following definitions shall apply:
Grams of VOC per Liter of Coating, Less Water and Less Exempt Compounds = ![]() |
Where: | Ws | = | weight of volatile compounds in grams |
|
Ww | = | weight of water in grams |
|
Wes | = | weight of exempt compounds in grams |
|
Vm | = | volume of material in liters |
|
Vw | = | volume of water in liters |
|
Ves | = | volume of exempt compounds in liters |
For coatings that contain reactive diluents the grams of VOC per Liter of Coating Less Water and Less Exempt Compounds shall be calculated by the following equation:
Grams of VOC per Leter of Coating, Less Water and Less Exempt Compounds = ![]() |
Where: | Ws | = | weight of volatile compounds evolved during curing and analysis, in grams |
|
Ww | = | weight of water evolved during curing and analysis, in grams |
|
Wes | = | weight of exempt compounds evolved during curing and analysis, in grams |
|
Vm | = | volume of the material prior to reaction, in liters |
|
Vw | = | volume of water evolved during curing and analysis, in liters |
|
Ves | = | volume of exempt compounds evolved during curing and analysis, in liters |
Grams of VOC per Liter of Material = ![]() |
Where: | Ws | = | weight of volatile compounds in grams |
|
Ww | = | weight of water in grams |
|
Wes | = | weight of exempt compounds in grams |
|
Vm | = | volume of material in liters |
(A) Negative Photoresist Operation is a process where the maskant hardens when exposed to light and the unhardened maskant is stripped, exposing the substrate surface for chemical milling or chemical processing.
(B) Positive Photoresist Operation is a process where the maskant softens when exposed to light and the softened maskant is stripped, exposing the substrate surface for chemical milling or chemical processing.
VOC Composite Partial Pressure is calculated as follows:
Where: | Wi | Weight of the "i"th VOC compound, in grams | |
|
Ww | Weight of water, in grams | |
|
We | Weight of exempt compound, in grams | |
|
MWi | Molecular weight of the "i"th VOC compound, in grams per gram-mole | |
|
MWw = | Molecular weight of water, in grams per gram-mole | |
|
MWe | Molecular weight of exempt compound, in grams per gram-mole | |
|
Ppc | VOC composite partial pressure at 20oC, in mm Hg | |
|
Vpi | Vapor pressure of the "i"th VOC compound at 20oC, in mm Hg |
(c) Requirements
(A) A person shall not apply to aerospace components any coatings, including any VOC-containing materials added to the original coating supplied by the manufacturer, which contain VOC in excess of the limits specified below:
VOC LIMIT
Grams Per Liter of Coating
Less Water and Less Exempt Compounds
|
1/1/96 |
1/1/97 |
1/1/98 |
1/1/99 |
1/1/00 |
1/1/02 |
COATING |
|
|
|
|
|
|
Primers |
|
|
|
|
|
|
General |
|
350 |
350 |
350 |
350 |
350 |
Low Solids Corrosion Resistant Primer |
|
650 |
650 |
650 |
350 |
350 |
Topcoat |
420 |
420 |
420 |
420 |
420 |
420 |
Pretreatment Coating |
780 |
780 |
780 |
780 |
780 |
780 |
VOC LIMIT
Grams Per Liter of Coating
Less Water and Less Exempt Compounds
|
1/1/96 |
1/1/97 |
1/1/98 |
1/1/99 |
1/1/00 |
1/1/02 |
COATING |
|
|
|
|
|
|
Adhesive Bonding Primers General Long Term (Metal to Structural Core Bonding) |
|
805 800 |
805 800 |
805 800 |
805 250 |
250 250 |
Short Term (Metal to Structural Core Bonding) |
|
250 |
250 |
250 |
250 |
250 |
Flight-Test Coating Used on Missiles or Single Use Target Craft All Other |
420 840 |
420 840 |
420 840 |
420 840 |
420 840 |
420 840 |
Fuel-Tank Coating General Epoxy |
420 |
420 680 |
420 680 |
420 420 |
420 420 |
420 420 |
Fuel-Tank Adhesive |
620 |
620 |
620 |
620 |
620 |
620 |
Electric- or Radiation-Effect Coating |
800 |
800 |
800 |
800 |
800 |
800 |
Touch-up, Line-Sealer Maskants |
750 |
750 |
750 |
750 |
750 |
750 |
Photolithographic Maskant |
850 |
850 |
850 |
850 |
850 |
850 |
Temporary Protective Coating |
250 |
250 |
250 |
250 |
250 |
250 |
Space-Vehicle Coatings Electrostatic Discharge Protection Coating Other Space-Vehicle Coatings Adhesives |
800 1000 800 |
800 1000 800 |
800 1000 800 |
800 1000 800 |
800 1000 800 |
800 1000 800 |
Wing Coating |
750 |
750 |
750 |
750 |
750 |
750 |
Impact Resistant Coating |
420 |
420 |
420 |
420 |
420 |
420 |
High-Temperature Coating |
850 |
850 |
850 |
850 |
850 |
850 |
Antichafe Coating |
600 |
600 |
600 |
600 |
600 |
600 |
Rain Erosion-Resistant Coating |
800 |
800 |
800 |
800 |
800 |
800 |
Fire-Resistant Coating Civilian Military |
650 970 |
650 970 |
650 970 |
650 970 |
650 970 |
650 970 |
Conformal Coating |
750 |
750 |
750 |
750 |
750 |
750 |
Sealant |
600 |
600 |
600 |
600 |
600 |
600 |
Adhesives Non-Structural Structural Autoclavable Non-Autoclavable |
250 50 850 |
250 50 850 |
250 50 850 |
250 50 850 |
250 50 850 |
250 50 850 |
Optical Anti-Reflective Coating |
700 |
700 |
700 |
700 |
700 |
700 |
VOC LIMIT
Grams Per Liter of Coating
Less Water and Less Exempt Compounds
|
1/1/96 |
1/1/97 |
1/1/98 |
1/1/99 |
1/1/00 |
1/1/02 |
COATING |
|
|
|
|
|
|
Wire Coatings Electronic Wire Coating Anti-Wicking Pre-Bonding Etchant Phosphate Ester Resistant Ink |
420 420 420 925 |
420 420 420 925 |
420 420 420 925 |
420 420 420 925 |
420 420 420 925 |
420 420 420 925 |
Metallized Epoxy Coating |
700 |
700 |
700 |
700 |
700 |
700 |
Clear Topcoat |
520 |
520 |
520 |
520 |
520 |
520 |
Scale Inhibitor |
880 |
880 |
880 |
880 |
880 |
880 |
Primer Compatible with Rain Erosion-Resistant Coating |
850 |
850 |
850 |
850 |
850 |
850 |
(B) A person shall not apply to aerospace assemblies and/or components any Unicoat, including any VOC-containing materials added to the original coating supplied by the manufacturer, which contain VOC in excess of 420 grams of VOC per liter of coating, less water and less exempt compounds. Documents shall be provided to the Executive Officer or his designee demonstrating that the unicoat is being used in lieu of the application of a primer and topcoat, and the applicant must receive written approval for the use of the unicoat specifying the conditions of application from the Executive Officer or his designee.
(C) Maskant Requirements
(i) A person shall not apply maskant for chemical processing to aerospace components unless the emissions are collected and reduced pursuant to subparagraph (c)(5), or the maskant contains less than 250 grams of VOC per liter of coating, less water and less exempt compounds, and less perchloroethylene (PERC).
(ii) A person shall not apply maskant for chemical milling to aerospace components unless the emissions are collected and reduced pursuant to subparagraph (c)(5), or the maskant contains less than 250 grams of VOC per liter of coating, less water and less exempt compounds.
(D) Fastener Installation:
After January 1, 1992, a person shall not use any coatings, including any VOC-containing materials added to the original coating supplied by the manufacturer, to install any fastener into any aerospace component or assembly, which contain VOC in excess of the limits specified below:
VOC LIMIT
Grams Per Liter of Coating,
Less Water and Less Exempt Compounds
COATING
Solid-Film Lubricant |
880 |
Dry Lubricative Materials |
675 |
(E) Fastener-Lubricative Coatings:
A person shall not apply to aerospace fastener any coatings, including any VOC-containing materials added to the original coating supplied by the manufacturer, which contain VOC in excess of the limits specified below:
VOC LIMIT
Grams Per Liter of Coating,
Less Water and Less Exempt Compounds
COATING | 1/1/94 | 1/1/96 | 1/1/97 | 1/1/98 |
Solid-Film Lubricant | 880 | 880 | 800 | 250 |
Dry Lubricative Materials | 250 | 250 | 120 | 120 |
Barrier Coating | 790 | 420 | 420 | 420 |
(F) Non-Fastener Lubricative Coatings:
A person shall not apply to any non-fastener aerospace components any coating, including any VOC-containing materials added to the original coating supplied by the manufacturer, which contain VOC in excess of the limits specified below:
VOC LIMIT
Grams Per Liter of Coating,
Less Water and Less Exempt Compounds
COATING
Solid-Film Lubricant |
880 |
Dry Lubricative Materials |
675 |
(G) For low-solids adhesive coatings or sealants, the appropriate limits in subparagraph (c)(1)(A) shall be expressed in grams of VOC per liter of material.
(A) A person shall not use VOC-containing materials for cleaning or clean up, excluding coating stripping and equipment cleaning unless:
(i) the VOC composite partial pressure is 45 mm Hg or less at a temperature of 20oC (68oF); or
(ii) the material contains 200 grams or less of VOC per liter of material.
(B) A person shall not use stripper on aerospace components unless:
(i) it contains less than 300 grams of VOC per liter of material; or
(ii) the VOC composite partial pressure is 9.5 mm Hg (0.18 psia) or less at 20oC (68oF).
(C) A person shall not atomize any solvent into open air.
Cleaning of coating application equipment and storage of solvent laden cloth and paper shall comply with provisions of Rule 1171.
Effective January 1, 1992, a person or facility shall not apply coatings unless the coating is applied with properly operating equipment or controlled, according to operating procedure specified by the equipment manufacturer or the Executive Officer or his designee, and by the use of one of the following methods:
(A) electrostatic application; or
(B) flow coater; or
(C) roll coater; or
(D) dip coater; or
(E) high-volume, low-pressure (HVLP) spray; or
(F) hand application methods; or
(G) such other alternative application methods as are demonstrated to the Executive Officer, using District-approved procedures, to be capable of achieving at least equivalent transfer efficiency to method (c)(4)(E) and for which written approval of the Executive Officer has been obtained; or
(H) Approved air pollution control equipment under paragraph (c)(5).
Owners and/or operators may comply with provisions of paragraphs (c)(1), (c)(2), and (c)(4) by using approved air pollution control equipment provided that the VOC emissions from such operations and/or materials are reduced in accordance with provisions of (A) and (B).
(A) The control device shall reduce emissions from an emission collection system by at least 95 percent, by weight, or the output of the air pollution control device is less than 50 PPM calculated as carbon with no dilution.
(B) The owner/operator demonstrates that the system collects at least 90 percent, by weight, of the emissions generated by the sources of emissions.
(d) Recordkeeping Requirements
Records shall be maintained pursuant to the requirements of Rule 109.
(e) Determination of VOC Content
The VOC content shall be determined (less water and exempt solvents) for adhesives, coatings, and sealants using:
(f) Test Methods
When more than one test method or set of test methods are specified for any testing, a violation of any requirement of this rule established by any one of the specified test methods or set of test methods shall constitute a violation of the rule.
(g) Rule 442 Applicability
(h) Prohibition of Solicitation of Violations
(i) Alternative Emission Control Plans
An owner/operator may comply with the provisions of paragraph (c)(1) by means of an Alternative Emission Control
Plan pursuant to Rule 108.
(j) Reporting Requirements
Persons who perform qualification acceptance testing on coatings with a future compliance date for use in the District
shall, beginning July 1, 1994 and at
6-month intervals thereafter, submit a status report describing the progress toward the development of coatings
which satisfy future compliance dates. These reports shall contain, at a minimum:
Facilities testing coatings in the same coating category may submit joint status reports. Once compliance with future compliance dates is achieved and a status report is submitted documenting such, no further status reports need be submitted.
(k) Exemptions