CAS 26471-62-5 · K-REACH · Republic of Korea

TDI mixed isomers (toluene diisocyanate, 80:20 + 65:35 blends) under K-REACH

C9H6N2O2 · 甲苯二异氰酸酯

Status: Registered. TDI is registered under K-REACH and listed as a Priority Existing Chemical (PEC). Korean GHS classification matches REACH (Carc 2 + Acute Tox. 2 inhalation + Resp. Sens. 1 + Skin Sens. 1 + STOT SE 3 + STOT RE 2). **TDI IS on Korea TCCA Toxic Chemicals list** (heavier than MDI batch 30 which is NOT on TCCA): TCCA Toxic Chemicals Handling Permit at destination facility required (parallel layer to K-REACH chemical registration). NOT on Korean Drug Management Act precursor list. NO active Korean AD/CVD case on Chinese-origin TDI. **Korea has substantial domestic TDI production** at Yeosu (Hyosung Chemicals + Kumho Mitsui Chemicals integrated TDI + MDI chain); structurally balanced. KCFTA preferential zero-duty applies for Chinese-origin imports.

K-REACH treats TDI as a routine PEC-registered substance but **TCCA Toxic Chemicals Handling Permit at destination facility is the dominant practitioner overhead** (heavier than MDI batch 30 which is NOT on TCCA). Korea has **substantial domestic TDI production at Yeosu** (Hyosung Chemicals + Kumho Mitsui Chemicals integrated TDI + MDI chain); structurally balanced. NO active Korean AD/CVD case. KCFTA preferential zero-duty supports Chinese-origin supplemental supply. Korean downstream consumers: Hyundai Motor + KIA (automotive seat flexible PU foam), Korean mattress + furniture sector, Korean construction sector. **TDI distinguishing pattern across all 5 regimes**: closes toluene batch 20 chain (downstream TDI product) + Acute Tox. 2 inhalation H330 fatal-if-inhaled (more toxic than MDI batch 30 Acute Tox. 4) + Resp. Sens. 1 + same Annex XVII Restriction 56 diisocyanate training requirement as MDI batch 30 + Wanhua Chemical Yantai world-leading TDI capacity + flexible polyurethane foam primary downstream (~70% of demand, vs rigid PU dominant for MDI) + heavier compliance overhead than MDI in China (Highly Toxic) + TSCA (TRI + RMP) + Korea (TCCA) + Australia (SUSMP Schedule 7).

Listing and threshold

Substance TDI mixed isomers (toluene diisocyanate, 80:20 + 65:35 blends) (CAS 26471-62-5), C9H6N2O2
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: Carc. 2 (H351), Acute Tox. 2 inhalation (H330), Skin Irrit. 2 (H315), Eye Irrit. 2 (H319), Resp. Sens. 1 (H334), Skin Sens. 1 (H317), STOT SE 3 (H335), STOT RE 2 (H373), Aquatic Chronic 3 (H412)
  • Signal word: DANGER. GHS pictograms: GHS06 + GHS08
  • Korea Occupational Safety and Health Act (KOSHA) workplace exposure standard: 0.005 ppm 8-hr TWA
  • **Listed in Korea TCCA Toxic Chemicals list** (heavier than MDI batch 30 which is NOT on TCCA)
  • NOT on Korean Drug Management Act precursor list
  • Korean Customs Service (KCS) HS code: 292910
  • **IARC: Group 2B (possibly carcinogenic to humans)**

Restrictions and conditions of use

  • **TCCA Toxic Chemicals Handling Permit at destination facility required** (heavier than MDI batch 30 which is NOT on TCCA)
  • Chemical Accident Prevention Plan (CAPP) may be required at handling facilities
  • 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 TDI currently
  • KCFTA preferential zero-duty applies to Chinese-origin TDI (HS 292910)
  • **Workplace exposure-control + occupational asthma surveillance + medical surveillance** required for Resp. Sens. 1 + Acute Tox. 2 inhalation substances

Importer obligations

The Korean importer of record must hold K-REACH registration. **TCCA Toxic Chemicals Handling Permit at destination facility is the dominant practitioner-facing overhead** (heavier than MDI batch 30 which is NOT on TCCA). Korea has substantial domestic TDI production at Yeosu (Hyosung Chemicals + Kumho Mitsui Chemicals integrated TDI + MDI chain); supplemental imports flow during plant outages. Korean downstream consumers: Hyundai Motor + KIA (automotive seat flexible PU foam), Korean mattress + furniture sector (Sealy Korea, Korea Sleeptec), Korean construction sector.

Required documents

  • K-REACH registration number on Korean side (registrant or OR-appointed)
  • Korean-language MSDS compliant with Korean GHS reflecting H315 / H317 / H319 / H330 / H334 / H335 / H351 / H373 / H412 classification
  • Korean Customs Service (KCS) declaration with HS code 292910
  • **TCCA Toxic Chemicals Handling Permit** at destination facility
  • China-Korea FTA Form CO certificate of origin for preferential treatment
  • Industrial-grade specification certificate

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
  • **TCCA Toxic Chemicals Handling Permit at destination facility is the dominant practitioner overhead** (heavier than MDI batch 30 which is NOT on TCCA; mirror of phenol batch 13 + sulfuric acid batch 2 + formaldehyde batch 18 + benzene batch 22 + aniline batch 26 + EO batch 28 + PO batch 29 patterns)
  • **Workplace exposure-control + occupational asthma surveillance + medical surveillance** required for Resp. Sens. 1 + Acute Tox. 2 inhalation substances under Korean Industrial Safety and Health Act
  • Korea has substantial domestic TDI production at Yeosu (Hyosung Chemicals + Kumho Mitsui Chemicals integrated TDI + MDI chain)
  • KCFTA preferential zero-duty applies; verify producer-specific eligibility
  • No active Korean AD/CVD case on Chinese TDI currently
  • Korean downstream consumers: Hyundai Motor + KIA (automotive seat flexible PU foam), Korean mattress + furniture sector (Sealy Korea, Korea Sleeptec), Korean construction sector

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for tdi mixed isomers (toluene diisocyanate, 80:20 + 65:35 blends), see the CAS 26471-62-5 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the tdi mixed isomers (toluene diisocyanate, 80:20 + 65:35 blends) 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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