Product Name: Oil-Free Air Compressor Piston Ring, Filled with PTFE Oil-Free Air Compressor Piston Ring. Model NO.: DN25-200 Refrigerant Type: Freon Compress Level: Single-Stage Structure Type: Closed Type Cylinder Position: Vertical Cylinder Arrangement: Balanced Opposed Arrangement Cooling System: Air Cooling Lubrication Style: Oil-free Property: Filled PTFE Trademark: none Transport Package: Wooden Pallet Origin: China HS Code: 3926909090 Product Description Our company can provide oil-free air compressor sealing ring. The material is filled PTFE. The main filling materials are copper powder and glass fiber. Our company's products have the best record of continuous operation for 8000 hours.Production process: molding, turningProduct advantages: Enhanced grade, high temperature resistance, low temperature resistance, hydrolysis resistance, wear resistance, aging resistance, weather resistance, antistatic, chemical resistance, high strength, high flow, high impact resistance, high sliding, high gloss, high rigidity.