For those wondering, they do make zip ties out of PEEK[1] for high temperature ranges. They are rated up to mid 200s C for temperature and cost about $1-3 per tie.

I noticed that all zip ties seem to be made out of thermoplastic polymers (most are nylon). I assume something about the manufacturing of them rules out thermoset polymers? Anyone on HN care to enlighten us?

1: https://en.wikipedia.org/wiki/Polyether_ether_ketone