CAS 1305-62-0 · K-REACH · Republic of Korea

Calcium hydroxide (hydrated lime) under K-REACH

Ca(OH)2 · 氢氧化钙

Status: Registered. Calcium hydroxide is registered under K-REACH. NOT on Korea TCCA Toxic Chemicals list (verify against the current TCCA Toxic Chemicals list at https://www.nics.go.kr/ before relying). NOT on Korean Drug Management Act precursor list. NO active Korean AD/CVD case on Chinese-origin calcium hydroxide currently (verify against https://www.kita.org/ or Korea Trade Commission filings before invoicing). Korea has substantial domestic lime capacity (Hanil Cement Group, Sungshin Cement, multiple regional limestone-quarry operators; verify current operational status against the producers' public reporting before relying); structurally balanced. KCFTA preferential zero-duty applies for Chinese-origin imports.

K-REACH treats calcium hydroxide as a routine registered substance with no TCCA overlay. Korea has substantial domestic lime capacity. NO active Korean AD/CVD case. **Calcium hydroxide distinguishing pattern across all 5 regimes**: hydration of quicklime (CaO + H2O) production route + flue-gas desulfurisation (FGD) plus water plus wastewater treatment plus construction (mortar / lime plaster) plus steel-slag treatment plus food-grade Ca(OH)2 for sugar refining and dairy plus dental impression plaster downstream chains + sister to calcium oxide / quicklime (CAS 1305-78-8) lime chain + lower hazard profile than chlor-alkali products + China VAT export rebate.

Listing and threshold

Substance Calcium hydroxide (hydrated lime) (CAS 1305-62-0), Ca(OH)2
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: Skin Irrit. 2 (H315), Eye Dam. 1 (H318), STOT SE 3 (H335)
  • Signal word: DANGER. GHS pictograms: GHS05 + GHS07
  • KOSHA workplace exposure standard: 5 mg/m3 8-hr TWA (verify against KOSHA OEL database before relying)
  • NOT on Korea TCCA Toxic Chemicals list
  • NOT on Korean Drug Management Act precursor list
  • Korean Customs Service (KCS) HS code: 252220
  • IARC: not evaluated for calcium hydroxide as a discrete agent (verify against https://monographs.iarc.who.int/list-of-classifications)

Restrictions and conditions of use

  • No TCCA Toxic Chemicals Handling Permit required
  • KOSHA MSDS in Korean required at workplace
  • NO active Korean AD/CVD case on Chinese calcium hydroxide currently
  • KCFTA preferential zero-duty applies (HS 252220)

Importer obligations

Korean importer of record must hold K-REACH registration. Korea has substantial domestic lime capacity.

Required documents

  • K-REACH registration number on Korean side
  • Korean MSDS reflecting H315 / H318 / H335
  • KCS declaration with HS 252220
  • China-Korea FTA Form CO

Common compliance traps

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

  • Korea has substantial domestic lime capacity
  • KCFTA preferential zero-duty applies
  • NO active Korean AD/CVD case
  • NOT on TCCA Toxic Chemicals list

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for calcium hydroxide (hydrated lime), see the CAS 1305-62-0 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the calcium hydroxide (hydrated lime) 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

Referenced in

5 pages across the Sourzi moat

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