... requirement.Alumina ceramic is kind of structural ceramics, with insulation resistance, voltage resistance, high strength, good thermal ... technologyProcess range (mm)Outside Diameter1---300Inside Diameter0.5---300Length0.5---1200Accuracy of working (mm)Perpendicularity0.01Concentricity0.01Roundness0. ... piston rod, ceramic nozzle Precision Finishing 99.5% alumina ceramic shaft with mirror surface