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As of September 21, 2015 additions of Perfluorooctane Sulfonic Acid and Perfluorooctane Sulfonate (PFOS) to any chromium electroplating and/or anodizing tank are prohibited.
On April 7, 2016, the California Air Resources Board (ARB) approved three Non-Perfluorooctane Sulfonic Acid (PFOS) based chemical fume suppressants for use in specific chrome plate operations (two products for decorative operations and chromic acid anodizing, and one product for hard chrome plating). These products, as well as their corresponding surface tension requirements, have been added to the list of already approved fume suppressants [PDF].
California’s requirements are more stringent than the federal rule (40 CFR Part 63, National Emission Standards for Chromium Emissions From Hard and Decorative Chromium Electroplating and Chromium Anodizing Tanks, Subpart N), so these approved suppressants can be successfully used in Indiana and other states seeking to comply with Subpart N. Additionally, the attached list includes company and product information for Non-PFOS based wetting agents/fume suppressants/surfactants [PDF].
For further information as to non-PFOS alternatives, please contact Compliance Technical Assistance Program (CTAP) staff (800-988-7901, email@example.com). A CTAP consultation request can be made as well.
Existing operations must meet the following limits:
Immediately upon startup, new operations must meet the following limits:
If a facility completed its performance test for chromium emissions after January 25, 1995 and those results meet the lower limits, that facility is not required to re-test. However, if the test occurred prior to January 25, 1995, the facility is required to re-test.
The fume suppressant manufacturer and product name records are now required in addition to maintaining surface tension measurement and wetting addition records.
The following BMPs must be added to your Operations and Maintenance (O&M) Plan and put into practice:
Additional information concerning the amendments is summarized in Changes to 40 CFR 63, Subpart N [PDF].
For basic information on how to comply with the regulation, please review A Guidebook on How to Comply with the Chromium Electroplating and Anodizing National Emission Standards for Hazardous Air Pollutants [PDF], revised September 2004.