Asbestos-free filtering layer

摘要

Equal or better adsorbency at lower cost is obtained with a sheet filter of the type having a filtering layer comprised of a supporting layer formed of at least one fibrous material with at least one adsorbent material evenly distributed within the supporting layer, when the adsorbent material consists essentially of gamma -aluminum oxide instead of asbestos. A supplementary organic adsorbent material can be incorporated together with an inorganic filler such as kaolin or kieselguhr.