Colorless, transparent and flammable liquids with asphyxiant irritative odor. It changes into light yellow liquid in the light or air, whose steam is strong lacrimator. Easy soluble in water, with ethanol, ether, benzene, toluene, kerosene and petrol in any mix ratio of each other.

Used for producting n-butyraldehyde, n-butanol, rubber vulcanization accelerator, alcohol denaturant, and tanning agents, etc..