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I'm looking to use an epoxy in a high-temp environment like 800C, and one that is optically transparent at 450nm (not below 90% transmission). But i'm having trouble finding one. It can be made of any material, as long as it can be cured in a mold.

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  • $\begingroup$ Are you using the epoxy as just an edge sealant/adhesive or is the epoxy going to be some kind of surface/ window ? If the latter you should use a high temp glass, the technology for molding glass is well established. $\endgroup$
    – William Hird
    Sep 24 '18 at 23:49
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since cured epoxy is a carbon-based polymer, you will have a very hard time finding one that can stand 800C. Have you considered a sintered ceramic?

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    $\begingroup$ With 90% optical transmission? $\endgroup$
    – Solar Mike
    Sep 25 '18 at 4:30
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    $\begingroup$ Yeah, near-100% fully dense and optically transparent sintered ceramics have been around for ~40 years. Not used much but they do exist. $\endgroup$
    – niels nielsen
    Sep 25 '18 at 7:25
  • $\begingroup$ I want to see some of this mythical material $\endgroup$
    – DKNguyen
    Nov 17 '21 at 14:54

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