... electronic substrates, friction disc and sealing rings. Ultrafine Alumina Ceramic Powder Chemical Name Alumina Molecular Formula Al2O3 Molecular Weight 101.9 CAS# 1344 ... -997 Electrochip, structure ceramic, electronic ceramic,bioceramic, Advanced Refractory.Ceralumi-99 Structure ceramic, friction disk,vacuum tube,electrochip.Ceralumi-95 Structure ceramic,sealing ring,friction ...