... (glass) form of silicon dioxide (quartz, sand). Typical of glasses, it lacks long range order i Fused silica is a noncrystalline ... (glass) form of silicon dioxide (quartz, sand). Typical of glasses, it lacks long ... temperature and low thermal expansion coefficient. SiO:99% MinSize: 01,13,35mm 100F,200F,325F, or as the customers request Fused Silica