Features: The crucible is made of aluminum oxide with 1800 degree firing temperature and 40 hours sintering time. It cannot be used over 1800 degree Heating rate cannot be 50 degree /10mins. Avoid aluminum oxide reaction. Specification: Size(approximate data): upper outer dia : 76mm, base outer dia : 35mm , height : 60mm 100mL Corundum Crucible Alumina High Temperature Resistance 1800C Physical and chemical index: Al2O3: gt;99% R2OFe2O3:SiO2: Bulk density: gt;3.8g/cm3 Porosity: lt; 1% Bend strength: gt;350Mpa Compressive strength: gt;12000Mpa Dielectric constant: 2 Max work temperature (Short time) :1800 degree harga per pcs dengan tutup