Free lookupCAS 109-99-9

Tetrahydrofuran

CAS 109-99-9 · PubChem CID 8028 · C4H8O · 72.11 g/mol

Also called TETRAHYDROFURAN, Oxolane, Furanidine, Furan, tetrahydro-, Tetramethylene oxide.

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01GHS classification

Flammable

Irritant

Health Hazard

Signal word

Danger

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

Precautionary statement codes

P203, P210, P233, P240, P241, P242, P243, P261, P264+P265, P271, P280, P303+P361+P353, P304+P340, P305+P351+P338, P318, P319, P337+P317, P370+P378, P403+P233, P403+P235, P405, and P501

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H225Highly Flammable liquid and vapor

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H319Causes serious eye irritation

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H335May cause respiratory irritation

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H351Suspected of causing cancer

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

02Physical and chemical properties

Appearance

Colourless liquid with characteristic odour.

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Odour

Ether-like odor

Hazardous Substances Data Bank (HSDB) — fetched 2026-08-28

Melting point

-108.5 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Boiling point

66 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Flash point

-14.5 °C c.c.

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Auto-ignition temperature

321 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Flammable limits

Lower: 2% Upper: 11.8% (% by vol)

Hazardous Substances Data Bank (HSDB) — fetched 2026-08-28

Vapour pressure

Vapor pressure, kPa at 20 °C: 19.3

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Relative density

Relative density (water = 1): 0.89

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Solubility in water

Solubility in water: freely soluble

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Partition coefficient, log Kow

0.46 (estimated)

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Viscosity

0.5 mPa*s at 20 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

03Toxicological information

No published acute toxicity value was found for this substance in the sources we read. On a document, Section 11 would print unsourced — inference candidate rather than an estimate.

This page is the evidence. The document is the deliverable.

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What we read

Hazardous Substances Data Bank (HSDB), Regulation (EC) No 1272/2008 of the European Parliament and of the Council, ILO-WHO International Chemical Safety Cards (ICSCs).

23 sourced records for this substance are in the ledger. Values dated more than 30 days ago are re-fetched on the next document.

04Also in the ledger

Browse every chemical in the ledger · What a GHS safety data sheet contains