Thioacetic acid is a kind of acid containing sulfhydryl group, also known as thioacetic acid, ethyl thiohydroxic acid, ethyl sulfuric acid. Yellow smoky liquid, with unpleasant pungent odor, chemically active, highly reactive, can react with unsaturated aliphatic hydrocarbons and alcohols to produce mercaptan. Use thioacetic acid in laboratory instead of hydrogen sulfide, determination of cobalt and lead, determination of molybdenum, synthesis of thioaldehyde and thioketone, determination of esterase in histochemistry, as a tear gas, etc. Yellow smoke body. Melting point < -17ºC, boiling point 93ºC, relative density 1.065-1.069, 1.068 (20/4ºC), refractive index 1.4630, flash point 11ºC. Soluble in water, alcohol and ether. It has an unpleasant, pungent smell. The product is an acetyl sulfhydrating agent and a sulfhydrating agent in organic synthesis, mainly used for the synthesis of lipoic acid, cystine and mercaptocarboxylic acid, and also used for the synthesis of hormone modifiers and Chemicalbook agents, cephalosporin modifiers and fungicides, polymer modifiers and additives. Used in reagents, flavors, cosmetics, synthetic captopril and so on.