... 4. Max. service temp, 1800C. Model: Kejia Alumina Crucible(Round and Square)Features:1. High purity, (Al2O3≥99.7%; Fe2O3≤0.1%; ... SiO2≤0.2%.)2. High chemical etching resistance,3. Temperature tolerance, 1600deg C for long ... . Resistant to sudden cold and hot, un-explosive,5. High density of slip casting.Physical Character: Typical Physical PropertiesAl2O36075808592959999.8Density ...