CAS 98-82-8 · TSCA · United States of America

Cumene (isopropylbenzene) under TSCA

C9H12 · 异丙苯 / 枯烯

Status: Listed. Cumene is on the TSCA Inventory as a grandfathered pre-1979 substance and is currently listed as TSCA Active. **OSHA PEL 50 ppm 8-hr TWA, skin notation** at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels). NOT on EPA RMP threshold list (verify site-specific applicability against 40 CFR 68 Appendix A at https://www.ecfr.gov/current/title-40/part-68). NOT on DEA scheduling. **California Proposition 65 listed as carcinogen since 6 April 2010 following NTP Report on Carcinogens inclusion** (per OEHHA https://oehha.ca.gov/proposition-65/chemicals/cumene; cross-check against https://oehha.ca.gov/proposition-65/proposition-65-list before invoicing California-distributed product). **TRI Section 313 listed**: Form R annual reporting required where site exceeds thresholds. NO active US AD/CVD case on Chinese-origin cumene currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin cumene (HS 290270). Major US domestic producers (verify each company-site pair against the producer's public website before relying): INEOS Pasadena Texas, JLM Industries (Texas), Versalis (legacy Italian capacity not in US), Honeywell UOP licensing.

The US cumene lane is dominated by **OSHA PEL 50 ppm skin-notation plus Cal Prop 65 "WARNING" labelling (since 6 April 2010 per OEHHA listing) plus TRI Form R plus Section 301 List 3 25% additional duty plus IARC Group 2B (since 2013 Monograph 101) workplace surveillance overhead**. NO active US AD/CVD case. Major US producers: INEOS Pasadena Texas, JLM Industries Texas. **Cumene-Hock process route to phenol batch 13 plus acetone batch 15 dominates** (~95 percent of cumene demand globally).

Listing and threshold

Substance Cumene (isopropylbenzene) (CAS 98-82-8), C9H12
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 H226 / H304 / H315 / H373 / H400 / H411
  • OSHA PEL 29 CFR 1910.1000 Table Z-1: 50 ppm 8-hr TWA, skin notation (per https://www.osha.gov/annotated-pels)
  • NIOSH REL: 50 ppm 8-hr TWA, skin notation (verify against https://www.cdc.gov/niosh/npg/)
  • NOT subject to TSCA Section 6 Risk Evaluation currently
  • NOT on TSCA Section 5(a)(2) Significant New Use Rule list
  • NOT on EPA RMP threshold list
  • NOT on DEA List I or List II
  • **California Proposition 65 listed as carcinogen since 6 April 2010** (per OEHHA https://oehha.ca.gov/proposition-65/chemicals/cumene)
  • **TRI Section 313 listed**: Form R annual reporting required for facilities above thresholds
  • DOT hazardous materials regulation (49 CFR 172.101): UN 1918, Class 3, PG III
  • **IARC: Group 2B (possibly carcinogenic to humans) since 2013 IARC Monograph 101**

Restrictions and conditions of use

  • OSHA-compliant SDS and workplace HazCom training required
  • **Cal Prop 65 listing requires "WARNING"** on consumer products containing cumene above No-Significant-Risk-Level
  • NO active US AD/CVD case on Chinese-origin cumene currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin cumene (HS 290270)
  • **TRI Form R annual reporting** for facilities above thresholds
  • NFPA 30 Flammable and Combustible Liquids Code applies for storage

Importer obligations

TSCA is a self-certification regime. The dominant practitioner-facing layer for cumene is **OSHA PEL 50 ppm skin-notation plus Cal Prop 65 "WARNING" labelling plus TRI Form R plus Section 301 List 3 25% additional duty**. NO active AD/CVD case. Cumene is structurally captive within integrated phenol-acetone plants in most cases. Major US domestic producers: INEOS Pasadena Texas, JLM Industries Texas, Honeywell UOP licensing technology to multiple operators (verify each company-site pair against the producer's public website).

Required documents

  • TSCA Section 13 Import Certification statement on customs entry
  • OSHA-compliant SDS reflecting H226 / H304 / H315 / H373 / H400 / H411 classification
  • Customs entry CBP Form 7501 with HS code 290270 (cumene) and Section 301 List 3 25% duty applied
  • Cal Prop 65 "WARNING" label compliance documentation for consumer-product downstream applications
  • TRI Form R annual report (where site exceeds 25,000 lb manufacture / 10,000 lb other-use thresholds)
  • CDR filing every 4 years if site exceeds 25,000 lb/yr threshold
  • NFPA 30-compliant storage tank engineering documentation for bulk receipt

Common compliance traps

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

  • **Cal Prop 65 listing applies to all finished-product distribution to California**
  • **OSHA PEL 50 ppm 8-hr TWA plus skin notation** workplace exposure-control overhead
  • **TRI Form R annual reporting**
  • **IARC Group 2B since 2013 Monograph 101** drives long-term workplace surveillance planning
  • NO active US AD/CVD case on Chinese cumene currently
  • Section 301 List 3 25% additional duty applies; structurally lighter than caprolactam batch 14 plus acetic acid batch 19 lanes
  • Major US producers: INEOS Pasadena Texas, JLM Industries Texas, Honeywell UOP technology licensees
  • **Cumene-Hock process route to phenol batch 13 plus acetone batch 15 joint-product chain dominates** (~95 percent of cumene demand globally)

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for cumene (isopropylbenzene), see the CAS 98-82-8 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the cumene (isopropylbenzene) cornerstone hub covers the full sourcing chain.

For the structure and history of TSCA, see the TSCA glossary entry.

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Cross-jurisdiction profile and sourcing references

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