TOP SEALING HIGH SILICA FABRIC Made with continuous filament, 96% amorphous silica fibers, TOP SEALING HIGH SILICA FABRIC are widely used for applications that require high heat resistance, as well as abrasion and/or chemical resistance. Available in a variety of weights ranging from 18 oz/sy to 70 oz/sy, TOP SEALING HIGH SILICA FABRIC are widely used for the safety of personnel and equipment, and as thermal barriers to reduce energy costs.