CAS 7664-38-2 · TSCA · United States of America

Phosphoric acid under TSCA

H3PO4 · 磷酸

Status: Listed. Phosphoric acid is on the TSCA Inventory and currently listed as TSCA Active. **OSHA PEL 1 mg/m3 8-hr TWA** at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels). 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 phosphoric acid currently (verify against https://access.trade.gov/ before invoicing). **However, US has active AD/CVD measures on phosphate-derivative products** (e.g. phosphate fertilisers from Morocco and Russia per Mosaic petition; verify scope against access.trade.gov before relying on phosphate-chain duty status). Section 301 List 3 25% additional duty applies on Chinese-origin phosphoric acid (HS 280920) (verify against current USTR Section 301 schedule before invoicing). Major US domestic producers (verify each company-site pair against the producer's public website before relying): Mosaic Florida plus Louisiana phosphate chain, Nutrien (formerly PotashCorp) Aurora North Carolina, ICL Performance Products.

US phosphoric acid lane: **OSHA PEL 1 mg/m3 + Section 301 + active AD/CVD on phosphate-derivative products from third countries**. NOT on Cal Prop 65. NO active US AD/CVD case on phosphoric acid itself. Major US producers: Mosaic, Nutrien, ICL Performance Products.

Listing and threshold

Substance Phosphoric acid (CAS 7664-38-2), H3PO4
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR threshold: 25,000 lb manufactured or imported per site per year

Classifications under this regime

  • OSHA HCS: GHS H290 / H314
  • OSHA PEL 29 CFR 1910.1000 Table Z-1: 1 mg/m3 8-hr TWA (verify against https://www.osha.gov/annotated-pels)
  • NIOSH REL: 1 mg/m3 8-hr TWA, 3 mg/m3 STEL (verify against https://www.cdc.gov/niosh/npg/)
  • NOT subject to TSCA Section 6 Risk Evaluation
  • NOT on EPA RMP threshold list
  • NOT on DEA List I or List II
  • NOT on California Proposition 65 list (verify against OEHHA before relying on negative listing)
  • DOT 49 CFR 172.101: UN 1805, Class 8, PG III for solutions >70 percent
  • IARC: Not classified

Restrictions and conditions of use

  • OSHA-compliant SDS and workplace HazCom training required
  • NO active US AD/CVD case on Chinese-origin phosphoric acid currently
  • **US has active AD/CVD measures on phosphate-derivative products** from third countries (verify against access.trade.gov before relying on phosphate-chain duty status)
  • Section 301 List 3 25% additional duty applies on Chinese-origin phosphoric acid (HS 280920)

Importer obligations

TSCA self-certification regime. Major US producers: Mosaic Florida plus Louisiana phosphate chain, Nutrien Aurora North Carolina, ICL Performance Products.

Required documents

  • TSCA Section 13 Import Certification on customs entry
  • OSHA SDS reflecting H290 / H314
  • CBP Form 7501 with HS 280920 + Section 301 List 3 25% duty
  • CDR filing every 4 years

Common compliance traps

The pitfalls that have bitten importers on this lane in the past. None of these is theoretical.

  • OSHA PEL 1 mg/m3 8-hr TWA
  • NO active US AD/CVD case on phosphoric acid itself
  • **US has active AD/CVD measures on phosphate-derivative products** from third countries (verify against access.trade.gov before relying on phosphate-chain duty status)
  • Section 301 List 3 25% additional duty applies
  • Major US producers: Mosaic Florida plus Louisiana, Nutrien Aurora North Carolina, ICL Performance Products

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for phosphoric acid, see the CAS 7664-38-2 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the phosphoric acid cornerstone hub covers the full sourcing chain.

For the structure and history of TSCA, see the TSCA glossary entry.

Need cross-jurisdiction compliance support on this substance? Run it through the REACH / TSCA / IECSC / AICIS / K-REACH checker, or send us the substance and the destination and we will quote FOB China and CIF / DDP landed including the regulatory work on the destination side.

Read next

Cross-jurisdiction profile and sourcing references

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