Sintered Aluminum Oxide Sintered aluminum oxide in the company is produced by high temperature melting in furnace. The products are characterised with high pur ity ,low alkali,high bulk denity,high stuenth, well thermal shock resistance, high insulation and excellent corrosion resistance.The furnace's temperature over 1950'C ,alumina crystals complete sintering a--Al2O3.In reflect microscope,alumina crystals assume flat-shaped and short post shaped.