1.high purity,low abrade 2.good hermetical property 3.good hardness 4.good quality,low price 5.high hardness.wear resistance Alumina balls,nozzles,substrates have the performances of high purity,good hermetical property,good hardness,low abrade,anti-corrode,high grinding efficiency,no pollution and etc.The products are widely applicated in the industries of ceramic,electric power,petroleum, ...