Choosing your “O” Ring Material

When choosing an “O”-ring there are several factors to consider in determining proper selection including: the application for which the “O”-ring is to be used; the media to be sealed; the size of the fastener to be sealed; and the temperature and pressure to which the “O” ring will be subjected. Once each of these factors has been considered and an “O” ring has been chosen, engineering calculations should either be checked manually or by using “O” ring selection software.

Our customers can choose from six basic “O”-ring materials which range from 60 to 70 durometers in hardness depending on the chosen material. In addition to the materials listed below, other materials are available upon request.

Choosing the Right “O” Ring Material

  • EPDM
    Our EPDM compounds are commonly used in outdoor environments and are excellent for weather & water resistant applications/appliances having excellent ozone, steam and chemical resistance. The standard temperature range for EPDM ranges from –54°C to 107°C and –65°F to 225°F.
    Other temperature ranges available upon request.
  • BUNA- N (Nitrile)
    Our Buna-N compound is the most common seal material chosen by our customers because of its versatile resistance to petroleum-based substances, water and alcohols. The standard temperature range for Buna-N is from –40°C to 107°C and -40°F to 225°F.
    Other temperature ranges available upon request.
  • NEOPRENE (Chloroprene)
    Our neoprene compounds are commonly used in the refrigeration industry for their resistance to ammonia and freon. Neoprene is also used for numerous applications in the automotive industry because of its excellent resistance to oil. Resistance to ozone, sunlight and oxygen also make this a great choice for products exposed to adverse weather conditions. The standard temperature range for neoprene ranges from -40°C to 107°C and –40°F to 225°F.
    Other temperature ranges available upon request.
  • SILICONE
    Our silicone rubber has an excellent temperature range and can withstand low temperatures without becoming brittle. However, it is usually not recommended for dynamic seals because it does not have optimal solvent or oil resistance. The standard temperature range for silicone is from -62°C to 204°C and -80°F to 400°F.
    Other temperature ranges available upon request.
  • FLUOROSILICONE
    Our fluorosilicone compounds are commonly used in the automotive and aerospace industries because of their excellent fuel, oil and solvent resistance. The standard temperature range for fluorosilicone is from –55°C to 177°C and –67°F to 350°F.
    Other temperature ranges available upon request.
  • FLUOROCARBON (VITON)
    Our Viton compounds are the preferred choice when seals are required for aircraft engines and automotive fuel handling because of its excellent resistance to high temperatures and harsh chemicals. The standard temperature range for Viton is from –29°C TO 204°C and –20°F to 400°F.
    Other temperature ranges available upon request.
  • MILSPEC “O” RINGS
    ZaGO Manufacturing offers military standard “O”-Rings which meet the following military specs:
    • General Purpose Buna N
    • Buna N – Mil P 5315
    • Buna N – Mil P 25732
    • Buna N – Mil R 6855
    • Ethylene Propylene
    • Fluorosilicone – Mil R 25988 TY 1 CL 1
    • Silicone – ZZR 765 CL 2A or 2B
    • Fluorocarbon (Viton) – MIL R 83248 CL 1
    • Brown Viton
    • Neoprene
    • Teflon AMS 3652
  • FDA-Approved “O” Rings
    ZaGO can provide the following FDA approved “O” Rings:
    • BUNA
    • EP
    • SILICONE

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