In rotary applications, a turning shaft protrudes through the I.D. of the o-ring, continuously exposing the inside surface of the o-ring to friction-generated heat from the rotating shaft.

Elastomers are poor thermal conductors: if heat is generated faster than it can be dissipated, o-ring failure may result.

To help minimize o-ring heat buildup, especially in applications with shaft rotating speeds in excess of 180 surface feet per minute, the following mechanical design safeguards should be considered where applicable:

Best Choices

In rotary applications, polymer selection is based upon abrasion resistance, heat resistance, and the other environmental considerations mentioned above. For related polymer performance properties, refer to the Material Selection Guide.