Absolutely impossible with Teflon. The only way is a nasty chemical
conversion treatment of the Teflon surface into something bondable. You
can order material so treated on one side from mscdirect.com. Search for
"bondable ptfe". Ordinary epoxy will then work quite well.
There are some adhesives promoted as having several hundred psi of bond
strength for Delrin, but lack of peel strength is a problem. In any case
it's a tiny fraction of the strength you'd expect from epoxy on easier
materials. But it is more than zero.
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