{"data":{"id":"us/40-cfr-467.21","jurisdiction":"us","citation":"40 CFR 467.21","heading":"Specialized definitions.","body":"For the purpose of this subpart:\n(a) The “core” of the rolling with emulsions subcategory shall include rolling using emulsions, roll grinding, stationary casting, homogenizing, artificial aging, annealing, and sawing.\n(b) The term “ancillary operation” shall mean any operation not previously included in the core, performed on-site, following or preceding the rolling operation. The ancillary operations shall include direct chill casting, solution heat treatment, cleaning or etching, and degassing.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 467—ALUMINUM FORMING POINT SOURCE CATEGORY","Subpart B—Rolling With Emulsions Subcategory"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"46920c96265c2e8a4ce7cee0ec071644e6a3ab85ded1bd8eccce5500994cae88","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-467.20","next":"us/40-cfr-467.22"},"notice":"GroundRules: Original legal text. Not legal advice."}