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Least Brittle Polymer, Epoxy, Resin, Clay, or Putty?

Least Brittle Polymer, Epoxy, Resin, Clay, or Putty?

Least Brittle Polymer, Epoxy, Resin, Clay, or Putty?


I want to cast a polymer, epoxy, or resin. It must be crack-resistant when compressed. Prefer a clay or putty.

I tried JB SteelStik, and it cracked under compression.

Don't need bonding.

Fancy expensive products are not an option.

Fyi, this is related to a youth engineering program i started, for at-risk teenagers.


RE: Least Brittle Polymer, Epoxy, Resin, Clay, or Putty?

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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