IVALON® Surgical Products are constructed of a unique hydroxylated polyvinyl acetal (PVAc) sponge developed by the pioneer of modern PVAc products. PVAc sponge has been used around the world in a variety of medical applications for over forty years. IVALON® PVAc packings are lint and fiber free. They provide a unique combination of exceptional liquid absorption and wicking characteristics with high tensile strength.