CAS 7727-21-1 · K-REACH · Republic of Korea

Potassium peroxydisulfate (K2S2O8) under K-REACH

K2S2O8 · 过硫酸钾

Status: Registered. Potassium peroxydisulfate is registered under K-REACH. **Korea TCCA Toxic Chemicals list scheduling-potential** (verify against the current TCCA Toxic Chemicals list at https://www.nics.go.kr/ https://www.nics.go.kr/ before relying; Resp. Sens. 1 + Ox. Sol. 3 profile). NO active Korean AD/CVD case on Chinese-origin potassium peroxydisulfate currently (verify against current Korean Trade Commission AD case list at https://www.ktc.go.kr/ before relying). KCFTA preferential zero-duty applies for Chinese-origin imports. **Korea is a significant K2S2O8 consumer market** (Korean LG Chem + Hanwha Solutions + SKC + Kumho Petrochemical SBR / acrylic emulsion polymerisation initiator + Samsung Electronics + LG Display + SK hynix electronic-industry etchant) with significant Chinese-origin import dependency.

K-REACH treats potassium peroxydisulfate as a registered substance with **TCCA Toxic Chemicals Handling Permit overlay-potential (verify against NICS) + Resp. Sens. 1 + Skin Sens. 1 (hairdresser asthma) overlay**. KCFTA preferential zero-duty. NO active Korean AD/CVD. **Korean LG Chem + Hanwha Solutions + SKC + Kumho Petrochemical emulsion polymerisation initiator + Samsung Electronics + LG Display + SK hynix electronic-industry etchant downstream chains**. **K2S2O8 distinguishing pattern across all 5 regimes**: Production by electrolysis of potassium bisulfate / sulfuric acid (K2SO4 + H2SO4 yields H2S2O8 + KHSO4 then crystallisation); strong oxidiser (Ox. Sol. 3 + UN 1492 Class 5.1 PG III + ATEX dust-explosion hazard during handling + storage); **Resp. Sens. 1 H334 classification + Skin Sens. 1 H317 across all jurisdictions (notable occupational concern for hairdresser asthma + cosmetics-industry handling)**; **historical US AD/CVD A-570-847 + EU AD Reg (EC) No 1184/2007 (provisional) + Reg (EC) No 1192/2008 (definitive) + extended via successor measures on Chinese-origin persulfates (sodium + ammonium + potassium)** (verify exact current measures + duty rates per producer against access.trade.gov + EUR-Lex before invoicing); **emulsion polymerisation initiator ~50 to 60% of global consumption (acrylic + styrene-butadiene rubber SBR + styrene + vinyl acetate + acrylonitrile polymerisation) + electronic-industry etchant (printed circuit board cleaning + IC manufacture) + cosmetics hair-bleaching + textile + wood bleaching + total organic carbon (TOC) analyser reagent + organic-synthesis oxidant + emulsion-coating initiator downstream chains**; IARC not classified; major non-Chinese producers United Initiators (Germany Pullach + USA Helena AR) + Mitsubishi Gas Chemical (Japan) + Peroxychem / Evonik (USA + Belgium); **China is the dominant global persulfate producer** (Yatai Chemical Liaoning + Wuxi Honour Jiangsu + Hebei Jiheng + ABA Chemicals Jiangyin + Yatai Foshan).

Listing and threshold

Substance Potassium peroxydisulfate (K2S2O8) (CAS 7727-21-1), K2S2O8
Regime Korea Act on the Registration and Evaluation of Chemicals (Act No. 11789, "K-REACH" amended 2018)
Jurisdiction Republic of Korea
Status Registered
Tonnage threshold K-REACH registration required for existing chemicals manufactured or imported >1 tonne/year (verified per Korean Ministry of Environment / NIER guidance, https://chemical.chemlinked.com/chempedia/k-reach; threshold for new substances was reduced from 0.1 t/y to 1 t/y effective 1 January 2025 per K-REACH 2025 amendment)

Classifications under this regime

  • Korean GHS classification: Ox. Sol. 3 + Skin Irrit. 2 + Eye Irrit. 2 + STOT SE 3 + Acute Tox. 4 inhalation + Resp. Sens. 1 + Skin Sens. 1 (verify against current MoE / NIER GHS before relying)
  • **Korea TCCA Toxic Chemicals list scheduling-potential** (verify against https://www.nics.go.kr/ before relying)
  • Korean Customs Service (KCS) HS code: 283340
  • Korean MoEL OEL: 0.1 mg/m3 inhalable for persulfates + sensitiser notation typically (verify against current MoEL Industrial Safety + Health Act OEL list at https://www.moel.go.kr/ before relying)
  • **Resp. Sens. 1 + Skin Sens. 1 (notable for hairdresser asthma occupational concern)**
  • Korean DOT-equivalent UN 1492 Class 5.1 PG III oxidiser
  • IARC: Not classified

Restrictions and conditions of use

  • TCCA Toxic Chemicals Handling Permit may be required (verify against https://www.nics.go.kr/ before invoicing)
  • KOSHA MSDS in Korean required at workplace (Ox. Sol. 3 + Resp. Sens. 1 + Skin Sens. 1 + Acute Tox. 4 inhalation)
  • NO active Korean AD/CVD case on Chinese-origin potassium peroxydisulfate currently
  • KCFTA preferential zero-duty applies (HS 283340)

Importer obligations

Korean importer of record must hold K-REACH registration + **TCCA Toxic Chemicals Handling Permit at destination (verify against NICS database)**. Korea structurally net-importer with significant Chinese-origin import dependency for emulsion polymerisation + electronic-industry etchant sectors.

Required documents

  • K-REACH registration number on Korean side
  • TCCA Handling Permit at destination (where in scope)
  • Korean MSDS (Ox. Sol. 3 + Resp. Sens. 1 + Skin Sens. 1 + Acute Tox. 4 inhalation)
  • KCS declaration with HS 283340
  • China-Korea FTA Form CO
  • Korean DOT-equivalent UN 1492 Class 5.1 PG III oxidiser documentation

Common compliance traps

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

  • **Korea TCCA Toxic Chemicals list scheduling-potential**
  • KCFTA preferential zero-duty applies
  • NO active Korean AD/CVD case
  • **Korean LG Chem + Hanwha Solutions + SKC + Kumho Petrochemical SBR / acrylic emulsion polymerisation initiator + Samsung Electronics + LG Display + SK hynix electronic-industry etchant downstream chains**
  • Korean MoEL OEL 0.1 mg/m3 inhalable for persulfates + sensitiser notation
  • **Resp. Sens. 1 + Skin Sens. 1 (hairdresser asthma)**

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 K-REACH, see the K-REACH 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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