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About the Different Types of O-rings O-rings can be made of a very long list of exotic materials; most are inappropriate for SCUBA DIVING applications. The materials commonly used in SCUBA applications appear in the following table. Acrylonitrile-Butadiene Copolymers (NBR or Nitrile) Most o-rings used in SCUBA are manufactured from Nitrile, a hydrocarbon-based synthetic rubber. [Read More…]