... the advantages such as high strength, high chemical stability and thermal stability, it can resistant to high temperature, high pressure and ... ≥90 Fe2O3 ≤1 Water absorption, % ≤5 Acid resistance, % ≥98 Alkali resistance, % ≥80 ≥82 ≥85≥90 ≥95 Thermal resistance, % ≥1300 ≥1400 ≥1500≥1600 ≥1700Crushing strength ...