... 3.It is used in investment casting. 1.The Quartz powder`s main component is quartz.2.the density is 2 ... 000 grain system, the appearance is white, blue gray, gray and so on. Mainly used in glass, foundry industry, metallurgical industry, ... . 3. Usage: used in glass industry can produce all kinds of flat glass, wire glass, patterned glass, hollow glass, foam glass, glass tiles, all kinds of packaging ...