CAS 100-41-4 · TSCA · United States of America

Ethylbenzene under TSCA

C8H10 · 乙苯

Status: Listed. Ethylbenzene is on the TSCA Inventory and currently listed as TSCA Active. **EPA designated ethylbenzene as a TSCA Section 6(b) high-priority substance for risk evaluation in December 2019; risk evaluation underway (verify current TSCA Section 6 status and any draft / final risk evaluation against https://www.epa.gov/assessing-and-managing-chemicals-under-tsca before relying).** **OSHA PEL for ethylbenzene at 29 CFR 1910.1000 Table Z-1: 100 ppm 8-hr TWA + 125 ppm STEL (verify against https://www.osha.gov/annotated-pels before relying); NIOSH REL: 100 ppm 8-hr TWA + 125 ppm STEL (verify against cdc.gov/niosh).** NOT on EPA RMP threshold list. NOT on DEA scheduling. **California Proposition 65 carcinogen listed effective 11 June 2004 (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying).** NO active US AD/CVD case on Chinese-origin ethylbenzene currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin ethylbenzene (HS 290260) (verify against current USTR Section 301 schedule before invoicing). IARC Group 2B (verify against monographs.iarc.who.int Volume 77 before relying). Major US domestic producers (typically integrated with downstream styrene; verify each company-site pair against the producer's public website before relying): Westlake Chemical (formerly LyondellBasell SM/PO joint venture) Channelview Texas, INEOS Styrolution Pasadena Texas, Trinseo (formerly Styron / Dow Chemical) Midland Michigan plus Plaquemine Louisiana, AmSty (formerly Americas Styrenics, Chevron Phillips / Trinseo joint venture) Cape Industries North Carolina.

US ethylbenzene lane: **OSHA PEL 100 ppm + 125 ppm STEL + TSCA Section 6(b) high-priority December 2019 + Cal Prop 65 carcinogen 11 June 2004 + IARC Group 2B + UN 1175 Class 3 PG II**. **Cal Prop 65 listing triggers warning-label obligations on California-bound finished goods**. NO active US AD/CVD case. ~99% production is captive-feedstock for styrene. Major US producers: Westlake (Texas), INEOS Styrolution (Texas), Trinseo (Michigan + Louisiana), AmSty (North Carolina).

Listing and threshold

Substance Ethylbenzene (CAS 100-41-4), C8H10
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR threshold: 25,000 lb manufactured or imported per site per year

Classifications under this regime

  • OSHA HCS: Carc. 2 + Asp. Tox. 1 + STOT RE 2 ear damage + Flam. Liq. 2 + Acute Tox. 4 inhalation
  • OSHA PEL: 100 ppm 8-hr TWA + 125 ppm STEL at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels)
  • NIOSH REL: 100 ppm 8-hr TWA + 125 ppm STEL (verify against cdc.gov/niosh)
  • **TSCA Section 6(b) high-priority substance December 2019** (verify against https://www.epa.gov/assessing-and-managing-chemicals-under-tsca)
  • NOT on EPA RMP threshold list
  • NOT on DEA List I or List II
  • **California Proposition 65 carcinogen** effective 11 June 2004 (verify against OEHHA before relying)
  • DOT 49 CFR 172.101: UN 1175 Class 3 PG II
  • IARC Group 2B (possibly carcinogenic to humans) since Volume 77 (2000) (verify against monographs.iarc.who.int)

Restrictions and conditions of use

  • NO active US AD/CVD case on Chinese-origin ethylbenzene currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin ethylbenzene (HS 290260)
  • OSHA PEL 100 ppm 8-hr TWA + 125 ppm STEL applies
  • **TSCA Section 6(b) high-priority substance December 2019**
  • **Cal Prop 65 carcinogen 11 June 2004** triggers warning-label obligations on California-bound finished goods containing ethylbenzene

Importer obligations

TSCA self-certification regime. **Note that ethylbenzene is rarely traded as merchant cargo (~99% is captive-feedstock for downstream styrene), so merchant ethylbenzene imports into the US are uncommon.** Major US producers (typically integrated with styrene; verify each producer-site pair before relying): Westlake Chemical Channelview TX, INEOS Styrolution Pasadena TX, Trinseo Midland MI + Plaquemine LA, AmSty Cape Industries NC.

Required documents

  • TSCA Section 13 Import Certification on customs entry
  • OSHA SDS (Carc. 2 + Flam. Liq. 2 + STOT RE 2 + Asp. Tox. 1 hazard profile)
  • CBP Form 7501 with HS 290260 + Section 301 List 3 25% duty
  • CDR filing every 4 years
  • DOT documentation for UN 1175 Class 3 PG II
  • Cal Prop 65 warning label on California-bound finished goods containing ethylbenzene

Common compliance traps

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

  • OSHA PEL: 100 ppm 8-hr TWA + 125 ppm STEL Table Z-1
  • **TSCA Section 6(b) high-priority substance December 2019** (final risk evaluation may impose new restrictions)
  • **Cal Prop 65 carcinogen 11 June 2004** triggers warning-label obligations on California-bound finished goods
  • NO active US AD/CVD case on ethylbenzene itself
  • Section 301 List 3 25% additional duty applies
  • IARC Group 2B since Volume 77 (2000)
  • Major US producers (integrated with styrene): Westlake Channelview TX, INEOS Styrolution Pasadena TX, Trinseo Midland MI + Plaquemine LA, AmSty Cape Industries NC (verify each producer-site pair)

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for ethylbenzene, see the CAS 100-41-4 sourcing reference.

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