CAS 100-42-5

Styrene

苯乙烯

C8H8MW 104.15 g/molHS 290250 UN2055 · Class 3 · PG III

From the buying desk

Class 3 flammable. US TSCA Section 6 risk evaluation in progress. Ships in HDPE drums (rare for export), IBCs, or stainless ISO tanks. Polymerisation inhibitor (TBC, 4-tert-butylcatechol) added at 10 to 50 ppm; receiver should confirm inhibitor level on the COA.

Import Card

Before you order styrene from China, see its register listing, the duty, anti dumping cases and a supplier check on one card, each with its source and date.

Card for the US Card for Australia

Identifiers

Synonyms
Vinylbenzene, Phenylethene, Ethenylbenzene, Styrol
Formula
C8H8
Molecular weight
104.15 g/mol
SMILES
C=Cc1ccccc1
InChIKey
PPBRXRYQALVLMV-UHFFFAOYSA-N
HS code (6-digit)
290250

Transport and hazard profile

Transport classification, UN number UN2055, IMDG Class 3, Packing Group III.

GHS hazard statements, Warning. H-codes, H226, H315, H319, H332, H361d, H372. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Styrene

Read from the official lists by CAS 100-42-5. Screening only: check the source before you ship, store or report.

California Prop 65

Listed

Listed for cancer on April 22, 2016, with a safe harbor level of 27 µg a day.

Open the tool · Official source

OSHA exposure limit

Listed

Table Z-1: Set in Table Z-2 of 29 CFR 1910.1000.

Open the tool · Official source

Australian exposure standard

Listed

50 ppm, 213 mg/m³ as an 8 hour average, 100 ppm, 426 mg/m³ short term.

Open the tool · Official source

CERCLA reportable quantity

Listed

Reportable quantity 1,000 lb (454 kg). A package holding this much needs RQ on the shipping paper.

Open the tool · Official source

EPCRA Tier II threshold

No entry

Not on the Extremely Hazardous Substances list, so the general 10,000 lb Tier II threshold applies where an SDS is required.

Open the tool · Official source

Regulatory profile across 5 jurisdictions

Verified against ECHA, US EPA TSCA Inventory, MEE China IECSC, NIER K-REACH, and AICIS AIIC. Last verification 2026-04-30. Confirm with the regulator portal before any shipping decision.

EU REACH
Listed
US TSCA
Restricted

TSCA Section 6 risk evaluation in progress

China IECSC
Listed
Korea K-REACH
Listed
Australia AICIS
Listed

Look up other substances at the REACH / TSCA cross-jurisdiction checker.

Common applications

  • · Polystyrene (PS, EPS, GPPS, HIPS)
  • · ABS resin
  • · Styrene-butadiene rubber (SBR)
  • · Unsaturated polyester resin

Typical Chinese supplier geography

Major Chinese capacity sits in Liaoning, Zhejiang, Jiangsu. Coastal producers (Shandong, Jiangsu, Zhejiang) typically dominate export volume because of port access; inland producers (Inner Mongolia, Xinjiang, Shaanxi) compete on raw-material cost but add inland-rail or trucking cost to reach the coast.

Sourcing documentation chain

Every shipment of Styrene from China should include a per-batch COA, a current SDS per GB/T 17519 on the China side and the destination jurisdiction's standard on the import side, a packing list, a bill of lading, and a certificate of origin plus an MSA China DG packing certificate. For Incoterms reference see FOB, CIF, and CFR.

Sourcing Styrene?

Tell us the chemical, grade and quantity. A person on our team in Shanghai sends you a real, checked factory, and your first one is free.

Get your free Factory Match Or talk to our team

Read next

Where this substance shows up across Sourzi

Referenced in

20 pages across the Sourzi moat

This term shows up in 5 regulatory pages, 1 topic clusters, 14 chemical parks. Sample backlinks per content type below.

Regulatory (5)

Plus 2 more regulatory pages.

Topic cluster (1)

Park (14)

Plus 11 more chemical parks.

Free download

Free PDF: the MSDS verification template Sourzi runs against the supplier sheet for every CAS number we book out of China.