... SiO2:99.5% 2.Purity White: 70-94% 3.Usage: paint coating 4.all kinds of silica powder that can meet your ... , hard abrasive paper, sandpaper, emery cloth, etc.)6. Electronic: high-purity silicon metal, communication with optical fiber7. Rubber and plastic: packing ... , the crystal shape and lattice variation, it has a high temperature, thermal expansion coefficient is small, highly insulated, corrosion ...