... materials.Alumina crucibles’ features: 1, High purity: Al2O3> 99%, good chemical corrosion resistance 2, Good temperature ... densityProduct Description:Arc Straight alumina ceramic crucibles’ basic functions:Name: straight alumina cruciblesChemical Composition Al2O3 ≥ 99 R2O ≤ 0 ... roasting high, medium and low ceramic capacitors, NTC, PTC piezoelectric ceramic and lithium cobalt oxide, lithium ...