1.Precision dimension 2.Mechanical seals good 3.Polishing surface 4,Shaped as your designing and requirment 95%--99% AL2O3 ceramic bushing, ceramic plunger Main applications: The enterprises of Eletricity ,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 ...