CAS 7782-44-7 · K-REACH · Republic of Korea

Oxygen (O2) under K-REACH

O2 · 氧气

Status: Registered. Oxygen 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 oxygen currently. Korea has substantial domestic industrial-O2 production from cryogenic ASU operations (Linde Korea + Air Liquide Korea + Daesung Industrial Gases + SK materials), with major on-site supply for Hyundai Steel + POSCO + Samsung + SK Hynix semiconductor fabs; structurally domestic-supplied. KCFTA preferential zero-duty applies for any Chinese-origin imports (rare).

K-REACH treats oxygen as a routine registered substance with no TCCA overlay. Korea structurally domestic-supplied (Linde Korea + Air Liquide Korea + Daesung Industrial Gases + SK materials captive ASU). NO active Korean AD/CVD case. **Oxygen distinguishing pattern across all 5 regimes**: Production via cryogenic ASU dominant (co-produces N2 + O2 + Ar from atmospheric air ~78:21:1) + smaller volumes from PSA + VPSA for medical / smaller-scale + completes industrial-gas chain alongside H2 batch 47 + CO2 batch 77 + N2 batch 78 + steel-mill basic-oxygen-furnace (BOF) feedstock primary use ~50% plus medical-O2 (anaesthesia + emergency + chronic respiratory) plus oxy-fuel welding / cutting plus pulp-mill bleaching plus semiconductor wafer cleaning / oxidation plus chemical synthesis (EO + propylene oxide + acrylonitrile + caprolactam captive feedstock) downstream chains + moderate hazard profile across regimes (Ox. Gas 1 + Press. Gas + fire-acceleration in oxygen-enriched atmosphere) + no specific OSHA PEL or NIOSH REL (fire hazard governs handling) + China Catalog of Hazardous Chemicals as oxidizer (Hazardous Chemicals Operation Permit required) + USP / NF medical O2 (FDA drug regulation).

Listing and threshold

Substance Oxygen (O2) (CAS 7782-44-7), O2
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. Gas 1 + Press. Gas (compressed) or Press. Gas (refrigerated liquefied)
  • NOT on Korea TCCA Toxic Chemicals list
  • NOT on Korean Drug Management Act precursor list
  • Korean Customs Service (KCS) HS code: 280440
  • IARC: Not classified

Restrictions and conditions of use

  • No TCCA Toxic Chemicals Handling Permit required
  • KOSHA MSDS in Korean required at workplace (Ox. Gas 1 + Press. Gas + fire-acceleration handling)
  • NO active Korean AD/CVD case on Chinese oxygen currently
  • KCFTA preferential zero-duty applies (HS 280440)

Importer obligations

Korean importer of record must hold K-REACH registration. Korea has substantial domestic industrial-O2 production from cryogenic ASU operations (Linde Korea + Air Liquide Korea + Daesung Industrial Gases + SK materials); major on-site supply for Hyundai Steel + POSCO + Samsung + SK Hynix; structurally domestic-supplied with rare Chinese imports.

Required documents

  • K-REACH registration number on Korean side
  • Korean MSDS (Ox. Gas 1 + Press. Gas + fire-acceleration handling)
  • KCS declaration with HS 280440
  • 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 industrial-O2 production from cryogenic ASU operations
  • KCFTA preferential zero-duty applies
  • NO active Korean AD/CVD case
  • NOT on TCCA Toxic Chemicals list
  • Major Korean ASU operators: Linde Korea + Air Liquide Korea + Daesung Industrial Gases + SK materials; on-site supply at Hyundai Steel + POSCO + Samsung + SK Hynix

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for oxygen (o2), see the CAS 7782-44-7 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the oxygen (o2) 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

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