CAS 1336-21-6 · K-REACH · Republic of Korea

Ammonium hydroxide (ammonia solution) under K-REACH

NH4OH (NH3 + H2O) · 氢氧化铵 / 氨水

Status: Registered. Ammonium hydroxide is registered under K-REACH. **Korea TCCA Toxic Chemicals list status: verify the current TCCA Toxic Chemicals list entry against the most recent National Institute of Chemical Safety (NICS) toxic-chemical database before relying** (NH4OH at ≥10% NH3 with Skin Corr. 1B + Eye Dam. 1 hazard profile may trigger TCCA scheduling). NOT on Korean Drug Management Act precursor list. NO active Korean AD/CVD case on Chinese-origin ammonium hydroxide currently. Korea has substantial domestic ammonia production (Lotte Fine Chemical Ulsan + Hanwha Solutions Yeosu Haber-Bosch ammonia plants) with downstream NH4OH solution preparation, plus electronic-grade NH4OH demand for Samsung + SK Hynix semiconductor wet-cleaning + photoresist developer markets. KCFTA preferential zero-duty applies for Chinese-origin imports.

K-REACH treats ammonium hydroxide as a registered substance with **TCCA Toxic Chemicals scheduling potentially applicable at ≥10% NH3** (verify against NICS database). Korea domestic-supplied for industrial NH4OH; electronic-grade demand for Samsung + SK Hynix semiconductor wet-cleaning + photoresist developer. NO active Korean AD/CVD case. **NH4OH distinguishing pattern across all 5 regimes**: Aqueous solution of anhydrous ammonia batch 38 (anhydrous at CAS 7664-41-7 separately registered); typical commercial 25-30% (industrial) and 5-10% (household cleaner) + closes ammonia chain alongside anhydrous NH3 + AN batch 41 + urea batch 5 + cleaning products + electronics (semiconductor wet-cleaning + photoresist developer) + pharma buffer + water-treatment + fertilizer + pulp-mill Kraft + food-grade E527 downstream chains + moderate hazard profile across regimes (Skin Corr. 1B + Eye Dam. 1 + STOT SE 3 + Aquatic Acute 1 at ≥10% NH3; UN 2672 Class 8 PG III at 10-35%; UN 2073 Class 2.2 at >35%) + IARC not classified + US OSHA PEL 50 ppm + NIOSH REL 25/35 + EPA RMP 20,000 lb aqueous ≥20% + EPA CAA Section 112 HAP + China Catalog of Hazardous Chemicals + Australian SUSMP Schedule 5 or 6 + GRAS / USP / NF / Ph. Eur. food-pharma overlay.

Listing and threshold

Substance Ammonium hydroxide (ammonia solution) (CAS 1336-21-6), NH4OH (NH3 + H2O)
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 Corr. 1B + Eye Dam. 1 + STOT SE 3 + Aquatic Acute 1 at ≥10% NH3
  • **Korea TCCA Toxic Chemicals list status: verify against NICS toxic-chemical database before relying**
  • NOT on Korean Drug Management Act precursor list
  • Korean Customs Service (KCS) HS code: 282814
  • IARC: Not classified

Restrictions and conditions of use

  • TCCA Toxic Chemicals Handling Permit obligations may apply where TCCA-scheduled (verify TCCA status against NICS database)
  • KOSHA MSDS in Korean required at workplace (Skin Corr. 1B + Eye Dam. 1 + Aquatic Acute 1)
  • NO active Korean AD/CVD case on Chinese ammonium hydroxide currently
  • KCFTA preferential zero-duty applies (HS 282814)

Importer obligations

Korean importer of record must hold K-REACH registration. Korea has substantial domestic ammonia production (Lotte Fine Chemical Ulsan + Hanwha Solutions Yeosu Haber-Bosch), plus electronic-grade NH4OH demand for Samsung + SK Hynix semiconductor wet-cleaning + photoresist developer markets.

Required documents

  • K-REACH registration number on Korean side
  • Korean MSDS (Skin Corr. 1B + Eye Dam. 1 + Aquatic Acute 1)
  • KCS declaration with HS 282814
  • 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 ammonia production (Lotte Fine Chemical Ulsan + Hanwha Solutions Yeosu)
  • KCFTA preferential zero-duty applies
  • NO active Korean AD/CVD case
  • **Korea TCCA Toxic Chemicals list status: verify against NICS database**
  • **Electronic-grade NH4OH demand for Samsung + SK Hynix semiconductor wet-cleaning + photoresist developer**

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for ammonium hydroxide (ammonia solution), see the CAS 1336-21-6 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the ammonium hydroxide (ammonia solution) 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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