... for your reference 3.Alumina ceramic crucible high-purity alumina crucible, 99% corundum ceramic crucible specifications: 5ml ... with high densityProduct Description:Arc Straight alumina ceramic crucibles’ basic functions:Name: straight alumina cruciblesChemical Composition Al2O3 ≥ 99 ... roasting high, medium and low ceramic capacitors, NTC, PTC piezoelectric ceramic and lithium cobalt oxide, lithium ...