CAS 7727-21-1 · TSCA · United States of America

Potassium peroxydisulfate (K2S2O8) under TSCA

K2S2O8 · 过硫酸钾

Status: Active. Potassium peroxydisulfate is on the TSCA Active Inventory. **NOT typically Cal Prop 65 listed at K2S2O8 level** (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying). **Historical US AD/CVD investigation A-570-847 on Chinese-origin persulfates (sodium + ammonium + potassium peroxydisulfate); verify current AD/CVD status + cash-deposit rate per producer against https://access.trade.gov/ before invoicing**; the cash-deposit rate at customs is the operative number, not the original investigation rate.

Potassium peroxydisulfate is TSCA-Active with **historical US AD/CVD on Chinese-origin persulfates A-570-847; verify current cash-deposit rate per producer at access.trade.gov before invoicing**. **Resp. Sens. 1 + Ox. Sol. 3 + ATEX dust-explosion hazard**. DOT UN 1492 Class 5.1 PG III oxidiser. EPCRA Section 312 Tier II 500 lb threshold. **Emulsion polymerisation initiator ~50 to 60% + PCB / IC etchant + cosmetics hair-bleaching + TOC analyser downstream**. **AD/CVD on persulfates is the practical US-import compliance pivot.**

Listing and threshold

Substance Potassium peroxydisulfate (K2S2O8) (CAS 7727-21-1), K2S2O8
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Active
Tonnage threshold TSCA Section 8(a) Chemical Data Reporting (CDR) at >25,000 lb/year per US site

Classifications under this regime

  • TSCA Active Inventory
  • **Historical US AD/CVD investigation A-570-847 on Chinese-origin persulfates; verify current AD/CVD status + cash-deposit rate per producer at https://access.trade.gov/ before relying**
  • OSHA PEL: not specifically established for potassium peroxydisulfate (verify against https://www.osha.gov/annotated-pels before relying; OSHA PEL on persulfates as airborne particulates may apply per PNOR Table Z-1)
  • NIOSH REL: not specifically established
  • ACGIH TLV-TWA: 0.1 mg/m3 inhalable typically for persulfates (verify against current ACGIH TLV documentation at https://www.acgih.org/ before relying)
  • IARC: Not classified (verify against https://monographs.iarc.who.int/ before relying)
  • **NOT typically Cal Prop 65 listed at K2S2O8 level** (verify against https://oehha.ca.gov/proposition-65/proposition-65-list before relying)
  • DOT 49 CFR: UN 1492 POTASSIUM PERSULFATE Class 5.1 PG III oxidiser
  • EPA Section 312 EPCRA Tier II reporting threshold: 500 lb (oxidiser-EHS-equivalent treatment; verify against https://www.epa.gov/epcra)

Restrictions and conditions of use

  • **Historical US AD/CVD investigation A-570-847 on Chinese-origin persulfates; verify per producer + current cash-deposit rate at https://access.trade.gov/ before invoicing**
  • No CBP-specific restriction beyond AD/CVD scope determination and HS 283340
  • DOT 49 CFR Class 5.1 oxidiser transport requirements UN 1492 PG III
  • EPCRA Section 312 Tier II reporting threshold 500 lb

Importer obligations

TSCA Section 13 import certification (positive). **Historical US AD/CVD on Chinese-origin persulfates A-570-847; verify per producer + per persulfate type + current cash-deposit rate at https://access.trade.gov/ before invoicing.** DOT 49 CFR Class 5.1 PG III oxidiser transport documentation. Major non-Chinese producers: United Initiators (Germany Pullach + USA Helena AR), Peroxychem / Evonik (USA), Mitsubishi Gas Chemical (Japan).

Required documents

  • TSCA Section 13 import certification
  • CBP entry HS 283340 (peroxosulphates persulphates)
  • SDS (Ox. Sol. 3 + Resp. Sens. 1 + Skin Sens. 1 + Acute Tox. 4 inhalation)
  • DOT shipping papers UN 1492 Class 5.1 PG III oxidiser
  • **AD/CVD entry summary CBP Form 7501 with current cash-deposit rate per producer where Chinese-origin (verify against https://access.trade.gov/)**
  • EPCRA Section 312 Tier II report at site if >500 lb on hand

Common compliance traps

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

  • **Historical US AD/CVD investigation A-570-847 on Chinese-origin persulfates; verify current cash-deposit rate per producer at access.trade.gov before invoicing (cash-deposit rate at customs is the operative number, not the original investigation rate)**
  • **Resp. Sens. 1 + Ox. Sol. 3 + ATEX dust-explosion hazard during handling + storage**
  • DOT UN 1492 Class 5.1 PG III oxidiser
  • EPCRA Section 312 Tier II reporting threshold 500 lb
  • **Emulsion polymerisation initiator ~50 to 60% of US consumption (acrylic + SBR + styrene + vinyl acetate + acrylonitrile polymerisation) + PCB / IC etchant + cosmetics hair-bleaching + TOC analyser downstream chains**

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for potassium peroxydisulfate (k2s2o8), see the CAS 7727-21-1 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the potassium peroxydisulfate (k2s2o8) 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

Referenced in

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