CAS 108-31-6

Maleic anhydride

顺丁烯二酸酐

C4H2O3MW 98.06 g/molHS 291714 UN2215 · Class 8 · PG III

From the buying desk

Sold as briquettes or flakes at 99.5%, and molten in tanks for large users. It is a respiratory and skin sensitizer, so dust handling and PPE matter at the receiver. Ships as a Class 8 corrosive.

Import Card

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

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Identifiers

Synonyms
MA, cis-Butenedioic anhydride, 2,5-Furandione
Formula
C4H2O3
Molecular weight
98.06 g/mol
SMILES
C1=CC(=O)OC1=O
InChIKey
FPYJFEHAWHCUMM-UHFFFAOYSA-N
HS code (6-digit)
291714

Transport and hazard profile

Transport classification, UN number UN2215, IMDG Class 8, Packing Group III.

GHS hazard statements, Danger. H-codes, H302, H314, H317, H318, H334, H372. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Maleic anhydride

Read from the official lists by CAS 108-31-6. Screening only: check the source before you ship, store or report.

California Prop 65

No entry

No entry for CAS 108-31-6 in the OEHHA list dated July 31, 2026.

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OSHA exposure limit

Listed

Table Z-1: 0.25 ppm, 1 mg/m³ as an 8 hour average.

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Australian exposure standard

Listed

0.25 ppm, 1 mg/m³ as an 8 hour average.

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CERCLA reportable quantity

Listed

Reportable quantity 5,000 lb (2,270 kg). A package holding this much needs RQ on the shipping paper.

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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.

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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
Listed
China IECSC
Listed
Korea K-REACH
Listed
Australia AICIS
Listed

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

Common applications

  • · Unsaturated polyester resins
  • · 1,4-Butanediol production
  • · Lubricant additives
  • · Agricultural chemicals

Sourcing documentation chain

Every shipment of Maleic anhydride 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.

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