1.high alumina content 2.good hermetical property 3.big density 4.high purity,good hardness 5.low abrade,anti-corrode Main application:The exterprises of Eletricity ,steel,smelt,mechanism,colliery,mine,chemical,cement,oil field ,will choose the different products according to their special requirments for the wearable mechanical instruments that works in the system of coal transfer,material ...