Because the friction part of some equipment is not suitable for lubrication, such as grease, it will be dissolved by solvents and become invalid. The ideal material for mechanical equipment parts without oil lubrication (direct load). This is because the coefficient of friction of this material is low among known solid materials. Its specific uses include bearings for chemical equipment, agricultural machinery, and paper machinery, such as piston rings, guide rings, and machine tool guides; in civil engineering, it is widely used in tunnels, bridges, large chemical pipelines, steel structure roof trusses, and storage tank support slides. Block, and used as a bridge pivot and bridge support.