CAS 7782-50-5 · TSCA · United States of America

Chlorine (Cl2) under TSCA

Cl2 · 氯气

Status: Listed. Chlorine is on the TSCA Inventory and is currently listed as TSCA Active. **OSHA PEL 1 ppm ceiling** at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels). **EPA RMP threshold 2,500 lb** for regulated toxic substance (verify current threshold against 40 CFR 68 Appendix A at https://www.ecfr.gov/current/title-40/part-68; low threshold reflects high hazard). NOT on DEA scheduling. NOT on Cal Prop 65 (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing). **TRI Section 313 listed**. **DHS CFATS chemical-of-interest** (chemical-weapons precursor concern; verify the current CFATS Appendix A tier and screening-threshold-quantity against the relevant DHS CISA portal before relying on Tier 1 specifically). NO active US AD/CVD case on Chinese-origin Cl2 currently (verify against https://access.trade.gov/ before invoicing; largely irrelevant due to bulk-trade constraint). Section 301 List 3 25% additional duty applies on Chinese-origin Cl2 (HS 280110). Major US domestic producers (verify each company-site pair against the producer's public website before relying on a specific kit of plant locations): Olin Corporation (a leading chlor-alkali producer with multiple sites; verify world-largest rank against the Olin investor site), Westlake Chemical, Occidental Chemical / OxyChem, Shintech / Shin-Etsu, all chlor-alkali integrated capacity.

The US chlorine lane has **substantial regulatory overhead**: EPA RMP 2,500 lb threshold + DHS CFATS Tier 1 + OSHA PEL 1 ppm ceiling + TRI Form R. **Cl2 is structurally NOT internationally traded as bulk**; intra-complex captive consumption dominates. Major US producers: **Olin Corporation (a leading chlor-alkali producer; verify world-largest rank against the Olin investor site)**, Westlake Chemical, Occidental Chemical / OxyChem, Shintech / Shin-Etsu, all chlor-alkali integrated capacity.

Listing and threshold

Substance Chlorine (Cl2) (CAS 7782-50-5), Cl2
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR (Chemical Data Reporting) threshold: 25,000 lb (11,340 kg) manufactured or imported per site per year

Classifications under this regime

  • OSHA Hazard Communication Standard (HCS): GHS H315 / H319 / H330 / H335 / H400
  • OSHA PEL 29 CFR 1910.1000 Table Z-1: 1 ppm ceiling (per https://www.osha.gov/annotated-pels)
  • NIOSH REL: 0.5 ppm ceiling (verify against https://www.cdc.gov/niosh/npg/)
  • **EPA RMP threshold 2,500 lb** for regulated toxic substance (verify against 40 CFR 68 Appendix A at https://www.ecfr.gov/current/title-40/part-68; low threshold reflects high hazard)
  • NOT subject to TSCA Section 6 Risk Evaluation
  • **DHS CFATS chemical-of-interest** under 6 CFR 27 Appendix A (chemical-weapons precursor concern; the CFATS programme statutory authority lapsed in July 2023 and has not been reauthorised as of the drafting date, so verify the current programme status and any specific tier designation against the DHS CISA portal before relying on a Tier 1 designation)
  • NOT on DEA List I or List II
  • NOT on California Proposition 65 list (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing)
  • **TRI Section 313 listed**
  • DOT hazardous materials regulation (49 CFR 172.101): UN 1017, Class 2.3 toxic gas

Restrictions and conditions of use

  • OSHA-compliant SDS and workplace HazCom training required
  • **OSHA PEL 1 ppm ceiling** workplace exposure-control overhead
  • **EPA RMP threshold 2,500 lb**: Risk Management Plan required
  • **DHS CFATS chemical-of-interest**: Site Security Plan required where CFATS-applicable (verify the CFATS programme status against the DHS CISA portal; statutory authority lapsed in July 2023 and the historical Site Security Plan obligation is contingent on reauthorisation)
  • NO active US AD/CVD case on Chinese-origin Cl2 currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin Cl2 (HS 280110)
  • **TRI Form R annual reporting**

Importer obligations

TSCA is a self-certification regime. **Cl2 is structurally NOT internationally traded as bulk**; standalone Cl2 import is rare. The dominant practitioner-facing layer is **EPA RMP 2,500 lb threshold (verify current threshold against 40 CFR 68 Appendix A) + DHS CFATS chemical-of-interest (verify current CFATS programme status against DHS CISA after the July 2023 statutory lapse) + OSHA PEL 1 ppm ceiling + TRI Form R**. NO active AD/CVD case. Major US producers: Olin, Westlake, Occidental Chemical / OxyChem, Shintech / Shin-Etsu, all chlor-alkali integrated capacity.

Required documents

  • TSCA Section 13 Import Certification statement on customs entry
  • OSHA-compliant SDS reflecting H315 / H319 / H330 / H335 / H400 classification
  • Customs entry CBP Form 7501 with HS code 280110 (Cl2) and Section 301 List 3 25% duty applied
  • **EPA RMP filing** (where site exceeds 2,500 lb threshold)
  • **DHS CFATS Top-Screen + Site Security Plan** where CFATS applies (verify the current CFATS programme status against DHS CISA before relying on a specific Tier 1 designation; the CFATS statutory authority lapsed in July 2023)
  • TRI Form R annual report

Common compliance traps

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

  • **EPA RMP threshold 2,500 lb** (verify against 40 CFR 68 Appendix A) + **DHS CFATS chemical-of-interest** (verify current CFATS programme status against DHS CISA; statutory authority lapsed July 2023) + **OSHA PEL 1 ppm ceiling** is dominant practitioner overhead
  • **Cl2 is structurally NOT internationally traded as bulk**
  • Major US producers: **Olin Corporation (a leading chlor-alkali producer; verify world-largest rank against the Olin investor site)**, Westlake Chemical, OxyChem, Shintech
  • NO active US AD/CVD case on Chinese Cl2 currently
  • Section 301 List 3 25% additional duty applies; structurally lighter than caprolactam batch 14 + acetic acid batch 19 lanes
  • Disaster legacy: Bhopal 1984 (Union Carbide MIC release in India) and Texas City 2005 (BP refinery hydrocarbon explosion) were not chlorine incidents; the chlorine-specific incident catalogue (such as Graniteville South Carolina 2005 chlorine railcar release) is the basis for the chemical-weapons-precursor concern under DHS CFATS, not Bhopal or Texas City (verify the chlorine-specific incident catalogue against CSB.gov before quoting any single example)

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for chlorine (cl2), see the CAS 7782-50-5 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the chlorine (cl2) 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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