Indiana Administrative Code
Title 326 - AIR POLLUTION CONTROL DIVISION
Article 8 - VOLATILE ORGANIC COMPOUND RULES
Rule 21 - Aerospace Manufacturing and Rework Operations
Section 21-3 - VOC emissions control requirements
Current through March 20, 2024
Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11
Affected: IC 13-15; IC 13-17
Sec. 3.
(a) The owner or operator of a source that is subject to this rule shall not apply to aerospace vehicles or components any coatings, including any VOC containing materials added to the original coating supplied by the manufacturer, that contain VOC in excess of the limits specified as follows:
VOC Content Limit for Primers, Topcoats, and Chemical Milling Maskants (lbs/gallon)a
| Coating Type | Limit |
| Primer | 2.9 |
| Primer for general aviation rework | 4.5 |
| Exterior primer for large commercial aircraft (components or fully assembled) | 5.4 |
| Topcoat | 3.5 |
| Topcoat for general aviation rework | 4.5 |
| Self-priming topcoat | 3.5 |
| Self-priming topcoat for general aviation rework | 4.5 |
| Chemical milling maskant, type I | 5.2 |
| Chemical milling maskant, type II | 1.3 |
| aCoating limits expressed in terms of pounds of VOC per gallon of coating less water and less exempt solvent. | |
VOC Content Limits for Specialty Coatings (g/L)b
| Coating Type | Limit | Coating Type | Limit | ||
| Ablative coating | 600 | Flight test coatings: | |||
| Adhesion promoter | 890 | Missile or single use aircraft | 420 | ||
| Adhesive bonding primers: | All other | 840 | |||
| Cured at 250°F or below | 850 | Fuel tank coating | 720 | ||
| Cured above 250°F | 1030 | High temperature coating | 850 | ||
| Adhesives: | Insulation covering | 740 | |||
| Commercial interior adhesive | 760 | Intermediate release coating | 750 | ||
| Cyanoacrylate adhesive | 1020 | Lacquer | 830 | ||
| Fuel tank adhesive | 620 | Maskants: | |||
| Nonstructural adhesive | 360 | Bonding maskant | 1230 | ||
| Rocket motor bonding adhesive | 890 | Critical use and line sealer maskant | 1020 | ||
| Rubber based adhesive | 850 | Seal coat maskant | 1230 | ||
| Structural autoclavable adhesive | 60 | Metallized epoxy coating | 740 | ||
| Structural nonautoclavable adhesive | 850 | Mold release | 780 | ||
| Antichafe coating | 660 | Optical antireflective coating | 750 | ||
| Bearing coating | 620 | Part marking coating | 850 | ||
| Caulking and smoothing compounds | 850 | Pretreatment coating | 780 | ||
| Chemical agent resistant coating | 550 | Rain erosion resistant coating | 850 | ||
| Clear coating | 720 | Rocket motor nozzle coating | 660 | ||
| Commercial exterior aerodynamic structure primer | 650 | Scale inhibitor | 880 | ||
| Compatible substrate primer | 780 | Screen print ink | 840 | ||
| Corrosion prevention compound | 710 | Sealants: | |||
| Cryogenic flexible primer | 645 | Extrudable/rollable/brushable sealant | 280 | ||
| Dry lubricative material | 880 | Sprayable sealant | 600 | ||
| Cryoprotective coating | 600 | Silicone insulation material | 850 | ||
| Electric or radiation effect coating | 800 | Solid film lubricant | 880 | ||
| Electrostatic discharge and electromagnetic interference (EMI) coating | 800 | Specialized function coating | 890 | ||
| Elevated temperature Skydrol resistant commercial primer | 740 | Temporary protective coating | 320 | ||
| Epoxy polyamide topcoat | 660 | Thermal control coating | 800 | ||
| Fire resistant (interior) coating | 800 | Wet fastener installation coating | 675 | ||
| Flexible primer | 640 | Wing coating | 850 | ||
| bCoating limits expressed in terms of mass (grams) of VOC per volume (liters) of coating less water and less exempt solvent. | |||||
(b) The following coating applications are exempt from the VOC content limits listed in subsection (a):
(c) The broad categories of primers, topcoats (including self priming topcoats), and chemical milling maskants (Type I or II) are not specialty coatings as listed in the table in subsection (a). The requirements do not apply to facilities that use separate formulations of primers, topcoats, and chemical milling maskants (Type I or II) in volumes of less than fifty (50) gallons per year, subject to a maximum exemption of two hundred (200) gallons total for such formulations applied annually.
