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“O”-RINGS

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.

Materials

Our customers can choose from six basic materials which come in durometer ranges from 60-70 hardness depending on the chosen material.  In addition to the materials listed below, other materials are available upon request.

Temperature Range Chart (Click to Enlarge)	Comparative Properties of Typical Elastomers (Click to Enlarge)

• ETHYLENE PROPYLENE (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 temperature range for EPDM ranges from –54*c to 149*c and –65*f to 300*f.

• 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 temperature range for Buna-N is from –54*c to 135*c and –65*f to 275*f.

• 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 temperature range for neoprene ranges from -54*c to 135*c and –65*f to 275*f.

• 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 temperature range for silicone is from -65*c to 232*c and -85*f to 450*f.

• FLUOROSILICONE
  Our fluorosilicone compounds are commonly used in the automotive and aerospace industries because of their excellent fuel, oil and solvent resistance.  The temperature range for fluorosilicone is from –65*c to 177*c and –85*f to 350*f.

• 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 temperature range for Viton is from –35*c TO 204*c and –31*f TO 400*f.

MILSPEC “O” RINGS

ZāGO Manufacturing offers military standard “O”-Rings which meet the following military specs:

1. General Purpose Buna N

2. Buna N - Mil P 5315

3. Buna N – Mil P 25732

4. Buna N – Mil R 6855

5. Ethylene Propylene

6. Fluorosilicone – Mil R 25988 TY 1 CL 1

7. Silicone – ZZR 765 CL 2A or 2B

8. Fluorocarbon (Viton) – MIL R 83248 CL 1

9. Brown Viton

10. Neoprene

11. Teflon AMS 3652

FDA-Approved “O” Rings

ZāGO can provide the following FDA approved  “O” Rings:

1. BUNA

2. EP

3. SILICONE

4. VITON