CAS 25038-54-4 · K-REACH · Republic of Korea

Nylon-6 (polycaprolactam, polyamide-6) under K-REACH

(C6H11NO)n · 尼龙-6 / 聚己内酰胺

Status: Registered. Nylon-6 is registered under K-REACH (constituent monomer caprolactam batch 14 IS K-REACH registered separately). NOT on Korea TCCA Toxic Chemicals list. NOT on Korean Drug Management Act precursor list. NO active Korean AD/CVD case on Chinese-origin nylon-6. Korea has substantial domestic nylon-6 production driven by **Capro Corporation Ulsan (a leading single-site caprolactam plant per the V15 audit verification; ~700 kt/yr; verify the most recent nameplate against the Capro Corporation corporate site before quoting world-largest rank)** (sister batch to caprolactam batch 14 + AS batch 12 Korea-as-exporter pattern) integrated upstream caprolactam + downstream nylon-6 chain via Hyosung TNC + Kolon Industries + Toray Advanced Materials Korea + TK Chemical + Huvis. **Korea is structurally net-EXPORTER of nylon-6** to ASEAN + India + Europe alongside Chinese supply. KCFTA preferential zero-duty applies for Chinese-origin imports.

K-REACH treats nylon-6 as a polymer (constituent monomer caprolactam batch 14 IS K-REACH registered). **Korea is structurally net-EXPORTER of nylon-6**: Capro Corporation Ulsan is a leading single-site caprolactam plant (verify the most recent nameplate against the Capro Corporation corporate site before quoting world-largest rank) driving the integrated nylon-6 chain. **Nylon-6 distinguishing pattern across all 5 regimes**: closes caprolactam batch 14 chain via ring-opening polymerisation (caprolactam → nylon-6; ~99% globally) + Article 2(9) polymer exemption + textile fibre + engineering plastic + film + tyre cord primary downstream + Sinopec Baling + Sinopec Shijiazhuang + Hengyi Petrochemical + Tianlong + Lujian Caprolactam Chinese capacity dominance (same producers as caprolactam batch 14, integrated upstream + downstream chain) + EU trade-defence status on Chinese-origin nylon-6 unverified at audit (verify against EUR-Lex https://eur-lex.europa.eu/ before invoicing) + AdvanSix (Hopewell Virginia integrated upstream caprolactam batch 14 + AS batch 12 chain) + Korea structurally net-EXPORTER (Capro Corporation Ulsan + Hyosung TNC + Kolon Industries + Toray Advanced Materials Korea + TK Chemical + Huvis integrated chain) + 0% China VAT export rebate.

Listing and threshold

Substance Nylon-6 (polycaprolactam, polyamide-6) (CAS 25038-54-4), (C6H11NO)n
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) (polymer Article-9-style exemption may apply)

Classifications under this regime

  • NOT classified under Korean GHS at industrial-grade (polymer)
  • NOT on Korea TCCA Toxic Chemicals list
  • Korean Customs Service (KCS) HS code: 39081000

Restrictions and conditions of use

  • No TCCA Toxic Chemicals Handling Permit required
  • NO active Korean AD/CVD case
  • KCFTA preferential zero-duty applies

Importer obligations

Korea has substantial domestic nylon-6 production driven by **Capro Corporation Ulsan (a leading single-site caprolactam plant per the V15 audit verification; ~700 kt/yr; verify the most recent nameplate against the Capro Corporation corporate site before quoting world-largest rank)** (mirror of caprolactam batch 14 + AS batch 12 Korea-as-exporter pattern) integrated upstream + downstream chain via Hyosung TNC + Kolon Industries + Toray Advanced Materials Korea + TK Chemical + Huvis. **Korea structurally net-EXPORTER of nylon-6** to ASEAN + India + Europe.

Required documents

  • K-REACH registration number (constituent monomer caprolactam batch 14 registration may be sufficient)
  • Korean Customs Service (KCS) declaration with HS code 39081000
  • 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 is structurally net-EXPORTER of nylon-6**: Capro Corporation Ulsan world's largest single-site caprolactam plant ~700 kt/yr (sister batch to caprolactam batch 14 + AS batch 12 Korea-as-exporter pattern) drives integrated nylon-6 chain at Hyosung TNC + Kolon Industries + Toray Advanced Materials Korea + TK Chemical + Huvis
  • 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 nylon-6 (polycaprolactam, polyamide-6), see the CAS 25038-54-4 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the nylon-6 (polycaprolactam, polyamide-6) 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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