Product name:rotor cylinder Material:Grey iron 250, GG25, EN-GJL-250 (EN-JL1040), FC250 Production process:Sand casting, annealing, precision machining, shell molding casting, resin sand casting, sand blasting Available service: OEM,Design optimization, precision machining, heat treatment, cnc machining, milling, drilling. Painting, powder coating, electroless nickel plating. Zinc Plating, E-coating. HDG, hot galvanizing Unit Weight: 0.5kg-500kg, 1lbs-1000lbs Size: According to drawing Customizable or not: Yes Packing: Carton, plywood cases, pallets Certificate: ISO9001:2008 Inspection report: Dimension report. Material report including chemical contents, tensile strength, yield strength and hardness. X-ray test report, Ultrasonic test report and Magnetic particle test available upon request. Application:Screw air compressor, sliding vane air compressor Origin: China