Fused Silica Supply / fused silica sales fused silica supply / melting quartz sales purity: the silica content of a special not less than 99.99%, a not less than 99.96%, two shall be not less than 99.95%, with not less than three 99.7%, four shall be not less than 99.6%. Fused silica supply / sales of fused silica is silicon dioxide (quartz, silica) amorphous (glassy). It is typical of glass, the atomic structure of the long-range disorder. Cross-linked by the three-dimensional structure of its high temperature and low thermal expansion coefficient. Selection of high-quality silica material [sio2> 99%] in the electric arc furnace or resistance furnace melting, the melting temperature of 1695-1720 ℃. Because of the high the sio2 melt viscosity in the 1900 ° C for the 7-th power of 10 Pa · s, can not use the casting method of molding. Cooling is to the vitreous can be used as firing products or do not burn products, raw materials.