Isobutanol is also known as isopropyl methanol and 2-methyl propanol, with a molecular formula of C4H10O. Molecular weight 74.12. It is a colorless liquid with a special smell, and is one of the main components of the aroma of fresh tea leaves, black tea and green tea. Boiling point 107.66℃. Relative density 0.8016 (20/4℃). Refractive index 1.395Chemicalbook9. Flash point 37℃. It is miscible with alcohol and ether, and slightly soluble in water. Its vapor can form an explosive mixture with air, and the explosion limit is 2.4% (volume). It can form an addition compound with calcium chloride (CaCl2·3C4H10O). It is a low-toxicity type, with an LD50 of 2.46g/kg (rat, oral).