... glass fiber, glass equipment, conductive glass, glass, special glass cloth and anti-rays, etc. the main raw material2. Ceramics ... cement physical properties of test materials (ie cement standard sand), etc. 4. Chemical: silicone compounds and water glass ... dioxide5. Machinery: casting sand of the main raw material, abrasive material (sand, hard abrasive paper, sandpaper, emery cloth, etc.)6. Electronic ...