... .Standard size in stock. 4.Thermal aging resistance. Details of air compressor o ring: 1. Materials: comply to ROHS, Viton, or NBR ... , NBR, or Silicone (VMQ), EPDM, Viton, etc.2. Temperature: -40~120°C. 3. Hardness: 20 to 90 shore A or as ... representatives follow up your new projects with high efficiency. Viton air compressor o ring