Tetrahydrofuran, also known as oxycyclopentane and 1,4-epoxybutane, is a heterocyclic organic compound with the chemical formula of C4H8O. It belongs to the ether category and is the complete hydrogenation product of furan. It is a colorless transparent liquid, soluble in water, ethanol, ether, acetone, benzene, etc. It is mainly used as solvent, chemical synthesis intermediate and analytical reagent.


Density: 0.89g/cm3
Melting point: - 108.5 ºC
Boiling point: 66 ºC
Flash point: - 14 ºC (CC)
Refractive index: 1.465 (20 ºC)
Saturated vapor pressure: 19.3 kPa (20 ºC)
Critical temperature: 268 ºC
Critical pressure: 5.19MPa
Ignition temperature: 321 ºC
Upper explosion limit (V/V): 11.8%
Lower explosive limit (V/V): 1.8%
Appearance: colorless liquid
Solubility: soluble in water, ethanol, ether, acetone, benzene and other organic solvents