... , 3) casting,spraying 4) coating materials. Brown Fused Alumina Corundum is used as polishing materials and precision sand mold ... coating materials.It is made by alumina as raw material, which is meited at high tempreture. The hardness is higher but ... %≥19CSS,Mpa≥800.20Mpa, RUL1600-1700PCL, %±0.216600*3hThermal conductivity W/m,k≤1.0refractoriness1790 best-selling and high quality brown fused alumina