Polyvinyl alcohol is an organic compound with the chemical formula [C2H4O]n, the appearance is white flake, flocculent or powdered solid, odorless. Soluble in water (above 95 °C), 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 in the manufacture of polyvinyl alcohol acetal, gasoline resistant pipes and vinylon , fabric treatment agents, emulsifiers, paper coatings, adhesives, glues, etc.