CAS 7664-39-3 · TSCA · United States of America

Hydrofluoric acid (HF) under TSCA

HF · 氢氟酸

Status: Listed. Hydrofluoric acid is on the TSCA Inventory and currently listed as TSCA Active. **OSHA PEL for hydrogen fluoride at 29 CFR 1910.1000 Table Z-2: 3 ppm 8-hr TWA (verify against https://www.osha.gov/annotated-pels before relying); NIOSH REL: 3 ppm 8-hr TWA + 6 ppm ceiling (verify against cdc.gov/niosh).** **EPA RMP threshold quantity for hydrogen fluoride 1,000 lb at 40 CFR Part 68 (verify against https://www.ecfr.gov/ before relying)**. NOT on DEA scheduling. **Hydrogen fluoride itself does NOT appear on the California Proposition 65 list (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying); certain fluoride salts (e.g., sodium fluoride, stannous fluoride) are listed for developmental endpoints, so finished-goods Prop 65 exposure depends on the specific fluoride form delivered into California, not HF gas / HF aqueous itself.** **NO active US AD/CVD case on Chinese-origin HF currently** (verify against https://access.trade.gov/ before invoicing); a US AD/CVD lane on Chinese-origin aluminium fluoride has existed historically (verify current case number, scope and status against access.trade.gov before invoicing; do not rely on any specific A-570 / C-570 case number without primary-source confirmation). Section 301 additional duty exposure applies on Chinese-origin HF (HS 281111) (verify current list, rate and exclusion status against the current USTR Section 301 schedule before invoicing). **EPA Clean Air Act Section 112 hazardous air pollutant (HAP) listing applies for hydrogen fluoride** (verify current Section 112 HAP list against https://www.epa.gov/haps before relying). Major US domestic HF producers: Honeywell International Geismar Louisiana + Calvert City Kentucky, Mexichem Fluor (now Orbia) US operations, DuPont (now Chemours) Louisville Kentucky; verify each company-site pair against the producer's public website before relying.

US HF lane: **OSHA PEL 3 ppm 8-hr TWA at Table Z-2 + NIOSH REL 3 ppm TWA + 6 ppm ceiling + EPA RMP 1,000 lb + EPA CAA Section 112 HAP + historical US AD/CVD lane on Chinese aluminium fluoride flows into HF chain (verify current case number, scope and status against access.trade.gov before invoicing) + Section 301 additional duty exposure (verify current list, rate and exclusion status against USTR)**. HF itself does NOT appear on Cal Prop 65; certain fluoride salts (NaF, SnF2) are listed for developmental endpoints. Major US producers: Honeywell + Mexichem Fluor / Orbia + Chemours.

Listing and threshold

Substance Hydrofluoric acid (HF) (CAS 7664-39-3), HF
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: Acute Tox. 1 oral / dermal / inhalation + Skin Corr. 1A
  • OSHA PEL: 3 ppm 8-hr TWA at 29 CFR 1910.1000 Table Z-2 (verify against https://www.osha.gov/annotated-pels)
  • NIOSH REL: 3 ppm 8-hr TWA + 6 ppm ceiling (verify against cdc.gov/niosh)
  • **EPA RMP threshold quantity 1,000 lb at 40 CFR Part 68** (verify against https://www.ecfr.gov/)
  • **EPA Clean Air Act Section 112 hazardous air pollutant (HAP)** (verify current HAP list against https://www.epa.gov/haps)
  • NOT subject to TSCA Section 6 Risk Evaluation
  • NOT on DEA List I or List II
  • Hydrogen fluoride itself does NOT appear on the California Proposition 65 list (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list); certain fluoride salts (e.g., sodium fluoride, stannous fluoride) are listed for developmental endpoints, so finished-goods Prop 65 exposure depends on the specific fluoride form delivered into California
  • DOT 49 CFR 172.101: anhydrous UN 1052 Class 8 PG I + 6.1; aqueous UN 1790 Class 8 PG I/II/III
  • IARC: Not classified

Restrictions and conditions of use

  • NO active US AD/CVD case on Chinese-origin HF currently
  • US AD/CVD lane on Chinese-origin aluminium fluoride has existed historically (verify current case number, scope and status against access.trade.gov before invoicing; do not rely on any specific A-570 / C-570 case number without primary-source confirmation)
  • Section 301 additional duty exposure applies on Chinese-origin HF (HS 281111) (verify current list, rate and exclusion status against the current USTR Section 301 schedule before invoicing)
  • OSHA PEL 3 ppm 8-hr TWA at Table Z-2 + NIOSH REL 3 ppm TWA + 6 ppm ceiling
  • **EPA RMP threshold 1,000 lb** triggers Risk Management Plan
  • **EPA Clean Air Act Section 112 HAP**
  • HF itself does NOT appear on Cal Prop 65; certain fluoride salts (NaF, SnF2) are listed for developmental endpoints, so finished-goods Prop 65 exposure depends on the specific fluoride form delivered into California (verify against OEHHA before relying)

Importer obligations

TSCA self-certification regime. **Chinese-origin aluminium fluoride AD/CVD historical context flows into Chinese HF / fluorochem chain duty exposure (verify current case number, scope and status against access.trade.gov before invoicing; do not rely on any specific A-570 / C-570 case number without primary-source confirmation).** Major US producers: Honeywell International Geismar LA + Calvert City KY, Mexichem Fluor / Orbia US operations, Chemours (formerly DuPont) Louisville KY.

Required documents

  • TSCA Section 13 Import Certification on customs entry
  • OSHA SDS (Acute Tox. 1 oral / dermal / inhalation + Skin Corr. 1A + Ca-gluconate-antidote handling)
  • CBP Form 7501 with HS 281111 + Section 301 List 3 25% duty
  • CDR filing every 4 years
  • DOT documentation for UN 1052 Class 8 PG I + 6.1 (anhydrous) or UN 1790 Class 8 PG I/II/III (aqueous)
  • EPA RMP filing where applicable
  • Cal Prop 65 warning label on California-bound finished goods containing HF

Common compliance traps

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

  • OSHA PEL 3 ppm 8-hr TWA at Table Z-2 + NIOSH REL 3 ppm TWA + 6 ppm ceiling
  • **EPA RMP threshold 1,000 lb**
  • **EPA Clean Air Act Section 112 HAP**
  • HF itself does NOT appear on Cal Prop 65; certain fluoride salts (NaF, SnF2) are listed for developmental endpoints (verify against OEHHA)
  • NO active US AD/CVD case on HF itself
  • Historical US AD/CVD lane on Chinese aluminium fluoride flows into HF / fluorochem chain duty exposure (verify current case number, scope and status against access.trade.gov; do not rely on any specific A-570 / C-570 number without primary-source confirmation)
  • Section 301 additional duty exposure applies on Chinese-origin HF (verify current list, rate and exclusion status against USTR before invoicing)
  • Major US producers: Honeywell + Mexichem Fluor / Orbia + Chemours

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for hydrofluoric acid (hf), see the CAS 7664-39-3 sourcing reference.

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

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

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Cross-jurisdiction profile and sourcing references

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