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Well, this is surprising. Glyos PVC doesn't melt when autoclaved! I just autoclaved this switch pin at 120 degrees C (248 degrees F) for 20 minutes under 18 psi pressure, and it didn't melt at all.
I did some research, and apparently plasticized PVC is autoclave safe, but non-plasticized PVC does melt. Huh. That's too bad, I wanted to melt one of my Villsers into a flat pancake to riff on all the Villser customizing going on lately.