... for shock absorber, including powder metallurgy piston, rod guide, foot valve, PTFE band for piston, Du bearing for rod guide. 5 ... 140T2. Hydraulic Press: 100T, 315T, 600T, 800T3. Six sinter furnaces, including one harden Sinter Furnace4. Heat treatment: Carbonitriding quenching and high frequency ... . Familiar with automobile industry requirement. powder metal sintered part piston/rod guide/base valve