A shaft seal’s elastomeric lip can break if flexed at temperatures lower than those for which the rubber is suited. Fracturing of the lip is most likely if the seal is exposed to low temperatures in combination with excessive dynamic run-out of the shaft. Figure 232 shows an example of a broken seal lip.

If lip breakage is a problem, check to be certain that the elastomer in use is suited to the temperatures of the application. See Low Temperature Effects for more information. You should also gauge the amount of dynamic run-out and reduce it if possible. See Eccentricity for more information on shaft run-out.

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