Alumex Kaolin clay Kentucky-Tennessee Clay Extenders / Fillers >> Clays Extenders / Fillers >> Kaolin SEALANT ADHESIVE Kaolin fillers are widely used in the adhesive, caulk, and sealant industries to provide various desirable physical and economic properties. Not only can these products be used to lower raw material costs, but they can also be used to enhance the cohesive strength of an adhesive. reinforcing, surface-modified fillers. Soft kaolin clay. Used as filler in adhesive, caulk, and sealant industries. Provides various physical and economic properties. Can enhance cohesive strength. Adsorbs residual oils on the substrate surface prior to cure.