Compressed and constrained (like an oring in a groove), or unconstrained (like a flat gasket)? Do you want it to seal, or just bear up under the load?
Try using a rubber-modified or flexible epoxy, or a high-modulus urethane, if constrained. If unconstrained, either figure out how to constrain it (add a metal surround/shell?) or add glass fiber or other types of reinforcement to the mix.
For better answers, some pictures might help. If only there was a common device that almost everybody had, that could take pictures and upload them to this site...
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RE: Least Brittle Polymer, Epoxy, Resin, Clay, or Putty?
Try using a rubber-modified or flexible epoxy, or a high-modulus urethane, if constrained. If unconstrained, either figure out how to constrain it (add a metal surround/shell?) or add glass fiber or other types of reinforcement to the mix.
For better answers, some pictures might help. If only there was a common device that almost everybody had, that could take pictures and upload them to this site...