US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 421 — NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORYSubpart J — Primary Tungsten Subcategory421.10140 C.F.R. § 421.101Specialized definitions.Last amended: 2016Year: 2026Length: 32 wordsOfficial source Cite as 40 C.F.R. § 421.101 (2026)For the purpose of this subpart the general information, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart. [49 FR 8812, Mar. 8, 1984]Previous40 C.F.R. § 421.100Next40 C.F.R. § 421.102