Polyvinylpyrrolidone PVP (K15 K17 K25 K30 K90)
PVP K15, PVP K17, PVP K25, PVP K30, PVP K90 exists in white powder or aqueous solution. PVP readily dissolves in water, alcohol, amine and halohydrocarbon, but is not dissolved in acetone and aether etc.. It has good solubility, biocompatibility, and physiologically inert, film-forming character, colloid protect ability and compound ability to many organic or inorganic compounds. It is also steady to acid, salt and heat, so it is widely used.