CAS 1330-20-7 · TSCA · United States of America

Xylene (mixed isomers) under TSCA

C8H10 · 二甲苯

Status: Listed. Xylene mixed isomers is on the TSCA Inventory as a grandfathered pre-1979 substance and is currently listed as TSCA Active. No PMN is required. **OSHA PEL 100 ppm 8-hr TWA, 150 ppm STEL** (29 CFR 1910.1000 Table Z-1, verified against https://www.osha.gov/annotated-pels/table-z-1). NOT on EPA RMP threshold list. NOT on DEA scheduling. **TRI Section 313 listed**: Form R annual reporting required for facilities above thresholds. NOT on California Proposition 65. NO active US AD case on Chinese-origin xylene currently confirmed (verify access.trade.gov). Section 301 List 3 25% additional duty applies on Chinese-origin xylene (HS 290244 / 290241 / 290242 / 290243). PX para-xylene (CAS 106-42-3 specifically) is on TSCA Inventory; production volumes in CDR data show US is structurally net-importer of PX (substantial volumes from Korean + Saudi + Indian Reliance Jamnagar supply).

The US xylene lane is dominated by **TRI Form R annual reporting + Section 301 List 3 25% additional duty** workplace + downstream compliance overhead. NO active US AD/CVD case. NO active TSCA Section 6 risk evaluation. Section 301 List 3 25% additional duty applies. Major US domestic producers: BP / INEOS Texas City + Whiting, ExxonMobil Beaumont, Chevron Phillips Cedar Bayou. **PX (para-xylene CAS 106-42-3) is structurally net-imported by US** from Reliance Jamnagar (India), S-Oil Onsan (Korea), GS Caltex Yeosu (Korea), Aramco / Saudi PetroRabigh. NOT on Cal Prop 65 (lighter than toluene batch 20). **Xylene distinguishing pattern in US lane**: lighter regulatory stack than toluene batch 20 (no Cal Prop 65, no Annex-XVII-equivalent, no Repr 2-driven workplace overhead) but PX is the structurally net-imported high-value isomer feeding PTA (batch 9) → polyester chain.

Listing and threshold

Substance Xylene (mixed isomers) (CAS 1330-20-7), C8H10
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 / H312 / H315 / H332 / H373
  • OSHA PEL 29 CFR 1910.1000: 100 ppm 8-hr TWA, 150 ppm STEL
  • NIOSH REL: 100 ppm 8-hr TWA, 150 ppm STEL
  • 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
  • NOT on California Proposition 65 list (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing)
  • **TRI Section 313 listed**: Form R annual reporting required for facilities above thresholds
  • DOT hazardous materials regulation (49 CFR 172.101): UN 1307, Class 3, PG II / III
  • IARC: nitric acid itself is not separately classified; occupational exposure to strong-inorganic-acid mists containing sulfuric acid was classified IARC Group 1 (laryngeal cancer) in Monograph Volume 54 (1992) (verify the current classification and Monograph volume against https://monographs.iarc.who.int/list-of-classifications before relying on the inorganic-acid-mist read-across for nitric acid)

Restrictions and conditions of use

  • No TSCA Section 6 use restrictions currently
  • OSHA-compliant SDS and workplace HazCom training required
  • NO active US AD/CVD case on Chinese-origin xylene currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin xylene (HS 290244 / 290241 / 290242 / 290243)
  • NFPA 30 Flammable and Combustible Liquids Code applies for storage
  • EPA Mobile Source Air Toxics rule (40 CFR Parts 79 + 80): xylene is part of BTX gasoline-blending limit
  • **TRI Form R annual reporting**

Importer obligations

TSCA is a self-certification regime: importers attest at customs entry that the substance is on the TSCA Inventory. The dominant practitioner-facing layer for xylene is **TRI Form R annual reporting + Section 301 List 3 25% additional duty**. NO active AD/CVD case so no AD margin documentation. NO active TSCA Section 6 risk evaluation currently. PX para-xylene is structurally important: US is net-importer of PX from Korean + Saudi + Indian Reliance Jamnagar supply, plus domestic supply (BP / INEOS Texas City + Whiting, ExxonMobil Beaumont, Chevron Phillips Cedar Bayou). Cal Prop 65 listing for ortho-xylene (CAS 95-47-6) was added briefly then removed; mixed xylenes NOT on Prop 65.

Required documents

  • TSCA Section 13 Import Certification statement on customs entry
  • OSHA-compliant SDS reflecting H226 / H312 / H315 / H332 / H373 classification
  • Customs entry CBP Form 7501 with HS code 290244 / 290241 / 290242 / 290243 and Section 301 List 3 25% duty applied
  • 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 (next cycle 2026)
  • 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.

  • **TRI Form R annual reporting** is the most-missed compliance step
  • NOT on Cal Prop 65 (lighter than toluene batch 20 which IS Cal Prop 65 listed)
  • NO active TSCA Section 6 risk evaluation currently
  • NO active US AD/CVD case on Chinese xylene currently
  • Section 301 List 3 25% additional duty applies; structurally lighter than caprolactam batch 14 + acetic acid batch 19 lanes
  • Major US domestic producers: BP / INEOS Texas City + Whiting, ExxonMobil Beaumont, Chevron Phillips Cedar Bayou
  • BTX chain economics: xylene + benzene + toluene markets coupled via naphtha reformer + steam-cracker pyrolysis-gasoline integrated US producer economics
  • PX (CAS 106-42-3 specifically) is the highest-value isomer and is structurally net-imported by US; Reliance Jamnagar (India), S-Oil Onsan (Korea), GS Caltex Yeosu (Korea), Aramco / Saudi PetroRabigh are major non-Chinese suppliers

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for xylene (mixed isomers), see the CAS 1330-20-7 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the xylene (mixed isomers) 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.

Read next

Cross-jurisdiction profile and sourcing references

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