... (including the battery) 4 ceramic materialsindustrial ceramics parts as wearable plungers,cylinder, ceramic knife, grinding ... mediastructural ceramics as plungers, pistons, valves, rods, rings,platesY ... purity > 99% Al2O3 as insulators, wearable elements.industry structure ceramics as plungers, pistons, tubes, rods, rings,platesAlumina ...