CAS 7704-34-9 · TSCA · United States of America

Sulfur (elemental) under TSCA

S8 · 硫磺

Status: Listed. Sulfur is on the TSCA Inventory and currently listed as TSCA Active. **No OSHA PEL specifically established for elemental sulfur** at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels before relying); the OSHA Particulates Not Otherwise Regulated (PNOR) framework provides 15 mg/m3 total dust + 5 mg/m3 respirable as default for fine-powder grade. NOT on EPA RMP threshold list. NOT on DEA scheduling. NOT on California Proposition 65 (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing). NO active US AD/CVD case on Chinese-origin sulfur currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin sulfur (HS 250300) (verify against current USTR Section 301 schedule before invoicing). **EPA FIFRA registers elemental sulfur as a pesticide active (fungicide)** (verify current FIFRA registration status against https://www.epa.gov/pesticide-registration before relying). **Food-grade GRAS** under 21 CFR 184.1500 for sulfur dioxide derivative; pharmaceutical-grade sulfur under USP / NF monograph (verify against https://www.ecfr.gov/ before relying). Major US domestic sulfur producers (Claus-process captive at refineries / sour-gas plants; verify each company-site pair against the producer's public website before relying): ExxonMobil refinery operations, Phillips 66 refinery operations, Marathon Petroleum refinery operations, Valero Energy refinery operations, Chevron refinery operations, plus ~6 Canadian-import flow tied to Alberta oil-sands tar-sands sour-gas captive (Suncor + Syncrude + CNRL + Cenovus).

US sulfur lane: **No OSHA PEL specifically established (PNOR framework default) + Section 301 List 3 + EPA FIFRA pesticide active (fungicide) + USP / NF for pharma-grade**. NOT on Cal Prop 65. NO active US AD/CVD case. **China is structurally net-IMPORTER of sulfur**; merchant Chinese-origin sulfur imports into US are rare. Major US producers: ExxonMobil + Phillips 66 + Marathon Petroleum + Valero + Chevron US refinery Claus-process captive; major imports from Canadian Alberta oil-sands captive.