CAS 109-99-9

Tetrahydrofuran

四氢呋喃

C4H8OMW 72.11 g/molHS 293211 UN2056 · Class 3 · PG II

From the buying desk

THF can form explosive peroxides once opened, so it is sold stabilized, usually with BHT. It ships as a Class 3 flammable liquid. Ask for the stabilizer level and water content on the COA.

Import Card

Before you order tetrahydrofuran 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
THF, Oxolane
Formula
C4H8O
Molecular weight
72.11 g/mol
SMILES
C1CCOC1
InChIKey
WYURNTSHIVDZCO-UHFFFAOYSA-N
HS code (6-digit)
293211

Transport and hazard profile

Transport classification, UN number UN2056, IMDG Class 3, Packing Group II.

GHS hazard statements, Danger. H-codes, H225, H319, H335, H351. Refer to the substance SDS Section 2 for the full classification.

US and Australian rules for Tetrahydrofuran

Read from the official lists by CAS 109-99-9. Screening only: check the source before you ship, store or report.

California Prop 65

Listed

Listed for cancer on December 17, 2021.

Open the tool · Official source

OSHA exposure limit

Listed

Table Z-1: 200 ppm, 590 mg/m³ as an 8 hour average.

Open the tool · Official source

Australian exposure standard

Listed

100 ppm, 295 mg/m³ as an 8 hour average.

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
Restricted

CMR Cat 2 classification under CLP

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

  • · Spandex and PTMEG production
  • · PVC adhesives and coatings
  • · Pharmaceutical solvent
  • · Polymer processing

Sourcing documentation chain

Every shipment of Tetrahydrofuran 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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