... , friction disc and sealing rings. Ultrafine Alumina Ceramic Powder Chemical Name Alumina Molecular Formula Al2O3 Molecular ... Ceralumi-997 Electrochip, structure ceramic, electronic ceramic,bioceramic, Advanced Refractory.Ceralumi-99 Structure ceramic, friction disk,vacuum tube, ... Structure ceramic,sealing ring,friction disk,vacuum tube. Storage Sealed in a dry ambience. Packing Packed with fiber ...