... ,precision sand mold, 3,casting,spraying 4,coating materials. Brown Fused Alumina is used as polishing materials and precision sand mold, casting ... ,spraying and coating materials. It is made by alumina as raw material, which is melted at high tempreture. The ... conductivity W/m,kless than 1.0refractoriness1790 superior Abrasives- brown fused alumina