... , Bearings, Rollers, Timing Screws, manifolds, Valves and Valve B Polyacetal has the following characteristics: Outstanding wear resistance ... applications replacing materials like; steel brass, bronze, copper and aluminium. Polyacetal have improved part life because of; ... Rollers, Timing Screws, manifolds, Valves and Valve Bodies, Washers, Wear Pads, and many industrial machine parts. Polyacetal Rods: ...