... steel, metal, high quality alloy plate or belt, general ply is 0.5 mm.2.Nonmetal board: plywood, fiberboard, dense ... screen tubes and screen buckets of different diameters.Technical standards: the smallest mechanical manufacture size 0.02 mm, etching area for 500mm ... technique could be used to make for the shape and various forms.Etching technique is widely used in integrated circuits, fluorescent ...