Fumed silica T40 nature of the product: it is a synthetic, hydrophilic amorphous silica formed by flame hydrolysis. Applications 1. The Silastic 4 of paints, coatings, printing inks, PBC ink. CCL 3.HCR cable materials and unsaturated polyester resin 5. Adhesives & Sealants. Insulation materials, insulation materials, refrigerators and electric furnace insulation plate features a liquid systems, adhesives, polymer rheology and thixotropy control. fully dispersed produce the best thickening and thixotropic effect 3.HCR, silicone rubber reinforcement 4, so do not unsaturated polyester resins having excellent transparency