CAS 7783-20-2 · K-REACH · Republic of Korea

Ammonium sulfate under K-REACH

(NH4)2SO4 · 硫酸铵

Status: Registered. Ammonium sulfate is registered under K-REACH and listed as a Priority Existing Chemical (PEC). Korea is structurally an **AS-exporter rather than AS-importer**: large domestic caprolactam capacity at Capro Corporation (Ulsan) and Kolon Industries (Gimcheon) generates substantial AS by-product surplus that exports primarily to South-East Asia and Latin America. KCFTA preferential zero-duty applies for Chinese-origin imports where Korean buyers source supplemental supply (typically for grade-specific applications not met by domestic caprolactam by-product).

K-REACH treats AS as a routine PEC-registered substance with no TCCA overlay. Korea is structurally **AS-exporter rather than AS-importer**: large domestic caprolactam capacity at Capro Corporation (Ulsan, world's largest single-site caprolactam plant ~700 kt/yr) and Kolon Industries (Gimcheon) generates substantial AS by-product surplus that exports primarily to South-East Asia (Vietnam, Thailand, Indonesia) and Latin America (Brazil, Mexico, Argentina). Imports are supplemental for grade-specific applications not met by domestic caprolactam by-product. KCFTA preferential zero-duty supports Chinese-origin supplemental supply. Korean Rural Development Administration (RDA) Fertiliser Quality Control system applies separately for fertiliser-product registration. The Korea-as-exporter pattern is structurally distinct from the Korea-as-importer pattern in DAP (where Korea has no domestic phosphate-rock and is structurally net-importer); for AS, Korea is a competitor to Chinese supply in third-market lanes (South-East Asia, Latin America) rather than a destination market.

Listing and threshold

Substance Ammonium sulfate (CAS 7783-20-2), (NH4)2SO4
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: typically NOT classified as hazardous (dust irritation only)
  • Korea Occupational Safety and Health Act (KOSHA) workplace exposure standard for nuisance dust: 10 mg/m³ TWA inhalable
  • NOT on Korea TCCA Toxic Chemicals list
  • NOT on Korea Drug Management Act precursor list
  • Korean Customs Service (KCS) HS code: 31022100
  • Listed in K-REACH database under "general industrial use, low-hazard"
  • NOT classified as carcinogen, mutagen, or reproductive toxicant under Korean GHS
  • Korean Rural Development Administration (RDA) Fertiliser Quality Control standard applies

Restrictions and conditions of use

  • No TCCA Toxic Chemicals Handling Permit required
  • No Chemical Accident Prevention Plan (CAPP) required
  • Korea Industrial Safety and Health Act (KOSHA) MSDS in Korean required at workplace
  • Korea Customs Service requires K-REACH registration number on import declaration
  • No active Korean AD/CVD case on Chinese-origin AS currently
  • KCFTA preferential zero-duty applies to Chinese-origin AS (HS 31022100); verify producer-specific eligibility (Form CO certified by Chinese authority)
  • Korean Rural Development Administration (RDA) Fertiliser Quality Control standard certification required for fertiliser-product registration

Importer obligations

The Korean importer of record must hold K-REACH registration in their own name or rely on an Only Representative (OR). Korea is structurally an AS-exporter (driven by Capro Corporation and Kolon Industries caprolactam by-product chains); imports are supplemental for grade-specific applications. Korean Rural Development Administration (RDA) Fertiliser Quality Control system applies separately for fertiliser-product registration. KCFTA preferential zero-duty supports Chinese-origin supply. Korean farming demand: rice (dominant crop), vegetables (greenhouses), fruit (orchards). Application season peaks Mar-May (spring) and Sep-Oct (autumn).

Required documents

  • K-REACH registration number on Korean side (registrant or OR-appointed)
  • Korean-language MSDS compliant with Korean GHS
  • Korean Customs Service (KCS) declaration with HS code 31022100
  • China-Korea FTA Form CO certificate of origin for preferential treatment
  • N minimum 21% (granular) or 20.5% (crystalline) specification certificate (per Korean RDA standard)
  • Korean Rural Development Administration (RDA) Fertiliser registration certificate (where required)
  • Granule-size specification (granular for direct-application; crystalline for NPK blending)

Common compliance traps

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

  • Korean GHS hazard-statement codes use H-codes mapped to Korean translations; SDS in English-only is rejected at workplace inspection
  • Korea is structurally AS-exporter (not importer) driven by Capro Corporation (Ulsan) and Kolon Industries (Gimcheon) caprolactam by-product chains. Korean AS exports primarily to South-East Asia (Vietnam, Thailand, Indonesia) and Latin America (Brazil, Mexico, Argentina). Imports are supplemental for grade-specific applications
  • KCFTA preferential zero-duty applies but verify producer-specific eligibility (Form CO certified by Chinese authority)
  • Korean Rural Development Administration (RDA) Fertiliser Quality Control standard is the dominant fertiliser-product-specific compliance layer
  • Korean farming demand: rice (dominant), vegetables, fruit. Application peaks Mar-May / Sep-Oct
  • Korean caprolactam capacity (Capro Corporation, Kolon Industries) is structural; Capro Corporation operates the world's largest single-site caprolactam plant at Ulsan (~700 kt/yr capacity → ~2.8 Mt/yr AS by-product theoretical)
  • NongHyup is dominant Korean farmer-level distribution channel; Dongbu Hannong and Namhae Chemical compete in commercial-grade segment

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 sulfate, see the CAS 7783-20-2 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the ammonium sulfate 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.

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Cross-jurisdiction profile and sourcing references

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