CAS 1305-78-8 · REACH · European Union

Calcium oxide (quicklime) under REACH

CaO · 氧化钙

Status: Registered. Calcium oxide is fully registered under REACH at the highest tonnage band (>1,000,000 tonnes/year). **Distinguishing pattern: limestone calcination at ~900 to 1100 degrees Celsius production route + steel-making and ferrous metallurgy plus construction (cement / mortar) plus FGD plus water plus wastewater treatment plus pulp and paper plus sugar refining downstream chains + sister to calcium hydroxide / hydrated lime (CAS 1305-62-0) lime chain + reacts exothermically with water releasing heat (slaking reaction) and producing Ca(OH)2; transport and storage moisture-control critical.** Reg (EC) 1272/2008 harmonised: Skin Irrit. 2 (H315) plus Eye Dam. 1 (H318) plus STOT SE 3 (H335 respiratory irritation). NOT SVHC. NOT Annex XIV. NO active EU AD case on Chinese-origin calcium oxide currently (verify against EUR-Lex https://eur-lex.europa.eu/ before invoicing). **CBAM Phase 1 status: lime products are NOT in CBAM Phase 1 scope** (Reg (EU) 2023/956 Annex I covers cement clinker / cement under CN 2523 but not quicklime under CN 2522.10; verify against the most recent CBAM Implementing Regulation before relying); **upstream cement clinker IS in CBAM Phase 1 scope** so cement-bound lime customers face CBAM obligations.

Calcium oxide is fully REACH-registered with **moderate hazard profile** (Skin Irrit. 2 plus Eye Dam. 1 plus STOT SE 3 respiratory) plus **slaking-reaction moisture-control warning**. NOT SVHC, NOT Annex XIV. NO active EU AD. Quicklime CN 2522.10 NOT in CBAM Phase 1; cement clinker upstream IS. **Steel-making plus construction plus FGD plus water-treatment plus pulp and paper plus sugar refining** downstream chains. Major Chinese producers same as Ca(OH)2 chain. Production: limestone calcination at ~900 to 1100 degrees Celsius.

Listing and threshold

Substance Calcium oxide (quicklime) (CAS 1305-78-8), CaO
Regime EU Regulation (EC) No 1907/2006: Registration, Evaluation, Authorisation and Restriction of Chemicals
Jurisdiction European Union (EU-27 plus EEA: Iceland, Liechtenstein, Norway)
Status Registered
Tonnage threshold Registration required for any importer or manufacturer placing >1 t/year on the EU market

Classifications under this regime

  • Harmonised CLP classification: Skin Irrit. 2 (H315), Eye Dam. 1 (H318), STOT SE 3 (H335) (verify against ECHA C&L Inventory https://echa.europa.eu/information-on-chemicals before relying)
  • Signal word: DANGER. GHS pictograms: GHS05 + GHS07
  • IARC: Group 3 (calcium oxide not separately classified; verify against https://monographs.iarc.who.int/list-of-classifications)
  • NOT subject to Drug Precursors or Explosives Precursors scheduling
  • ADR / RID transport classification: NOT typically regulated for industrial-grade CaO; UN 1910 listed but exemption applies for industrial-grade quicklime (verify against the most recent ADR before relying)

Restrictions and conditions of use

  • NOT on REACH Annex XIV (verify against ECHA https://echa.europa.eu/authorisation-list)
  • NOT classified as SVHC (verify against ECHA https://echa.europa.eu/candidate-list-table)
  • NOT subject to any Annex XVII restriction at industrial-grade level
  • NO active EU AD case on Chinese-origin calcium oxide currently (verify against EUR-Lex https://eur-lex.europa.eu/ before invoicing)
  • NOT in CBAM Phase 1 scope for quicklime CN 2522.10 (verify against Reg (EU) 2023/956 Annex I and the most recent CBAM Implementing Regulation before relying); **upstream cement clinker IS in CBAM Phase 1 scope** so cement-bound lime customers face CBAM obligations

Importer obligations

A non-EU producer cannot register directly under REACH. The EU importer of record must hold a registration or rely on an Only Representative (OR). Major Chinese producers: Sinoma multi-site, Anhui Conch Cement Group lime sister capacity, Shandong Chongqi Lime, Hebei Yanshan Lime, multiple regional limestone-quarry operators (verify each producer-site pair against the producer's public website before relying on a specific plant).

Required documents

  • REACH registration number on EU side
  • SDS reflecting H315 / H318 / H335 classification plus moisture-control warnings
  • CLP labelling with GHS05 + GHS07 + DANGER
  • Customs entry HS code 252210 (quicklime)
  • No ADR documentation typically required for industrial-grade CaO; verify against the most recent ADR before relying

Common compliance traps

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

  • **Steel-making and ferrous metallurgy plus construction (cement / mortar) plus FGD plus water-treatment plus pulp and paper plus sugar refining downstream chains**
  • NOT SVHC, NOT Annex XIV, NO active EU AD
  • **Reacts exothermically with water releasing heat (slaking reaction)**; transport and storage moisture-control critical
  • **Upstream cement clinker IS in CBAM Phase 1 scope** so cement-bound lime customers face CBAM obligations even though quicklime CN 2522.10 itself is not in Phase 1
  • Major Chinese producers: Sinoma multi-site, Anhui Conch Cement Group lime sister capacity, Shandong Chongqi Lime, Hebei Yanshan Lime; China dominates global lime capacity (verify percent-of-global share against ICIS or USGS Mineral Commodity Summaries before quoting; prior reports cited China at well above 50 percent of global ~430 Mt/yr lime capacity)
  • Production: limestone calcination at ~900 to 1100 degrees Celsius
  • Sister to calcium hydroxide / hydrated lime (CAS 1305-62-0) lime chain

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 oxide (quicklime), see the CAS 1305-78-8 sourcing reference.

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

For the structure and history of REACH, see the 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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