... the smelting of platinum, gold, stainless steel and other alloys. It has high purity, good corrosion resistance, low thermal conductivity, small ... main component SiO2 >98%, impurity(K2O,Na2O,Fe2O3)<0.2%. It has high strength, high thermal shock resistance, and can resist ... >70MPa . Ceramic ring,jewelry tools,Quartz products,ceramic gasket,ceramic loop