CAS 26471-62-5 · TSCA · United States of America

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

C9H6N2O2 · 甲苯二异氰酸酯

Status: Listed. TDI mixed isomers is on the TSCA Inventory and is currently listed as TSCA Active. **OSHA PEL 0.02 ppm (ceiling)** at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels; same as MDI batch 30). **California Proposition 65 listed as carcinogen since 7 April 1989 for 2,4-TDI and on a separate date for 2,6-TDI** (verify exact listing dates for both isomers against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before invoicing California-distributed product). **TRI Section 313 listed**: Form R annual reporting required (heavier reporting overhead than MDI batch 30 which is NOT on TRI). **EPA RMP threshold 10,000 lb** for regulated toxic substance Acute Tox. 2 inhalation (verify current threshold against 40 CFR 68 Appendix A at https://www.ecfr.gov/current/title-40/part-68). NOT on DEA scheduling. NO active US AD/CVD case on Chinese-origin TDI currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin TDI (HS 292910). NOT under active TSCA Section 6 risk evaluation (verify against https://www.epa.gov/assessing-and-managing-chemicals-under-tsca). Major US domestic producers (verify each company-site pair against the producer's public website before relying): BASF Geismar Louisiana, Covestro Baytown Texas (formerly Bayer MaterialScience).

The US TDI lane has **heavier regulatory profile than MDI batch 30**: TRI Form R required + EPA RMP 10,000 lb threshold required (vs not required for MDI). OSHA PEL 0.02 ppm (ceiling) + Cal Prop 65 "WARNING" labelling (since 1989) + occupational asthma surveillance + medical surveillance match MDI overhead. NO active US AD/CVD case. Section 301 List 3 25% additional duty applies. Major US producers: BASF (Geismar Louisiana), Covestro (Baytown Texas). US is comparatively self-sufficient. **TDI distinguishing pattern in US lane**: heavier downstream + emission-control overhead than MDI batch 30 due to Acute Tox. 2 inhalation classification + RMP threshold.

Listing and threshold

Substance TDI mixed isomers (toluene diisocyanate, 80:20 + 65:35 blends) (CAS 26471-62-5), C9H6N2O2
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR (Chemical Data Reporting) threshold: 25,000 lb (11,340 kg) manufactured or imported per site per year

Classifications under this regime

  • OSHA Hazard Communication Standard (HCS): GHS H315 / H317 / H319 / H330 / H334 / H335 / H351 / H373 / H412
  • OSHA PEL 29 CFR 1910.1000 Table Z-1: 0.02 ppm (ceiling) (per https://www.osha.gov/annotated-pels; same as MDI batch 30)
  • NIOSH REL: 0.005 ppm 8-hr TWA, 0.020 ppm STEL (occupational asthmagen + carcinogen; verify against https://www.cdc.gov/niosh/npg/)
  • **EPA RMP threshold 10,000 lb** (regulated toxic substance, Acute Tox. 2 inhalation)
  • NOT subject to TSCA Section 6 Risk Evaluation currently
  • NOT on TSCA Section 5(a)(2) Significant New Use Rule list
  • NOT on DEA List I or List II
  • **California Proposition 65 listed as carcinogen since 7 April 1989 for 2,4-TDI and on a separate date for 2,6-TDI** (verify exact listing dates for both isomers against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list)
  • **TRI Section 313 listed**: Form R annual reporting required (heavier than MDI batch 30 which is NOT on TRI)
  • DOT hazardous materials regulation (49 CFR 172.101): UN 2078 (TDI), Class 6.1, PG II
  • **IARC: Group 2B (possibly carcinogenic to humans) since 1986**

Restrictions and conditions of use

  • No TSCA Section 6 use restrictions currently
  • OSHA-compliant SDS and workplace HazCom training required
  • **OSHA PEL 0.02 ppm (ceiling) compliance** drives substantial workplace exposure-control overhead (same as MDI batch 30, occupational asthma surveillance + medical surveillance)
  • **Cal Prop 65 listing requires "WARNING"** on consumer products containing TDI above No-Significant-Risk-Level
  • **EPA RMP threshold 10,000 lb**: Risk Management Plan required
  • NO active US AD/CVD case on Chinese-origin TDI currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin TDI (HS 292910)
  • **TRI Form R annual reporting** (heavier than MDI batch 30)

Importer obligations

TSCA is a self-certification regime: importers attest at customs entry. The dominant practitioner-facing layer for TDI is **OSHA PEL 0.02 ppm (ceiling) compliance + Cal Prop 65 "WARNING" labelling + EPA RMP 10,000 lb threshold + TRI Form R annual reporting**. NO active AD/CVD case. Section 301 List 3 25% additional duty applies. Major US domestic producers: BASF (Geismar Louisiana), Covestro (Baytown Texas; formerly Bayer MaterialScience). US is comparatively self-sufficient for TDI through domestic supply.

Required documents

  • TSCA Section 13 Import Certification statement on customs entry
  • OSHA-compliant SDS reflecting H315 / H317 / H319 / H330 / H334 / H335 / H351 / H373 / H412 classification
  • Customs entry CBP Form 7501 with HS code 292910 (TDI) and Section 301 List 3 25% duty applied
  • **EPA RMP filing** (where site exceeds 10,000 lb threshold)
  • Cal Prop 65 "WARNING" label compliance documentation
  • TRI Form R annual report
  • CDR filing every 4 years if site exceeds 25,000 lb/yr threshold

Common compliance traps

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

  • **Heavier US-side regulatory profile than MDI batch 30**: TRI Form R required (TDI) vs not required (MDI); EPA RMP 10,000 lb threshold required (TDI) vs not required (MDI). TDI is significantly more regulated than MDI in US lane
  • **OSHA PEL 0.02 ppm (ceiling) compliance** + occupational asthma surveillance + medical surveillance (same as MDI batch 30)
  • **Cal Prop 65 listing applies to all finished-product distribution to California**
  • **EPA RMP threshold 10,000 lb**: Risk Management Plan filing required
  • **TRI Form R annual reporting**
  • NO active US AD/CVD case on Chinese TDI currently
  • Section 301 List 3 25% additional duty applies; structurally lighter than caprolactam batch 14 + acetic acid batch 19 lanes
  • Major US domestic producers: BASF (Geismar Louisiana), Covestro (Baytown Texas; formerly Bayer MaterialScience). US is comparatively self-sufficient through domestic supply

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 TSCA, see the TSCA 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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