... 000 grain system, the appearance is white, blue gray, gray and so on. Mainly used in glass, foundry industry, metallurgical ... bottles, glassware, such as: beer bottles, glass, vacuum flask and decorations, can be made of optical glass, glassware, glass fibers ... can be used for high-temperature kiln brick, common brick, and refractory materials. 7. Cement industry cement ingredients can be used for ...