... of Fe3O4: 0.004-0.005mm4. Full line products for shock absorber, including powder metallurgy piston, rod guide, foot valve, PTFE band ... rod guide. 5. PPAP III is submitted accordingly.ApplicationCar shock absorber, Motorcycle shock absorber, Bicycle shock absorberProcessingMixing powder——Forming——Sintering——Sizing——After treatment——Steam treatment ...