Polyvinyl alcohol (PVA) : organic compound, white, flake, floc, or powdery solid, tasteless. Soluble in water (above 95℃), slightly soluble in dimethyl sulfoxide, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc. Polyvinyl alcohol is an important chemical raw material, used to manufacture polyvinyl acetal, gasoline resistant pipe and vinylon synthetic fiber, fabric treatment agent, emulsifier, paper coating, adhesive, glue and so on.