99.7% High Purity Alumina Ceramic Crucible for Melting Furnace. High Purity Alumina: Al2O3 content exceeds 99.7% for superior performance. Extreme Heat Resistance: Withstands temperatures up to 1800C without failure. Customizable Dimensions: Available in various sizes from 5ml to 2500ml volume. Chemical Etching Resistance: High resistance to chemical corrosion for industrial use. Thermal Shock Resistance: Resistant to sudden cold and hot changes, non-explosive. Precision Surface Finish: Surface roughness between min Ra0.4 and max Ra0.8um. Isostatic Pressing: Manufactured using high-density isostatic pressing method. One-Year Warranty: Covers defects in materials or workmanship for 1 year.