Usage: As high quality refractory materials for refinery and glass industries as well as raw materials for special high alumina ceramics and silicon alumina alloys. Specifications: Al2O3: 54~56% SiO2: 38~42% Fe2O3: 0.5~0.7% TiO2: 1.5% max. K2O+Na2O 1%max Loss of Ignition: 0.52~0.88% Size: 0~150mm Price: 850~1300/t Hardness: 6.5~7.2 Density: 2.3g/cm3 Output: 1000t min.