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        Polyurethane (AU / AE):
        Polyurethane compounds offer exceptional abrasion and wear resistance and are offered in two distinctively different variations. For use in oil, use a polyester type which has low volume swell, but softens dramatically when exposed to water. For water sealing applications, use the polyether type which retains its integrity in water, but swells significantly when exposed to oil. A hybrid version that is acceptable for both applications is available at a substantially higher cost.

         


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