Depends on how high the heat source is. I would suggest testing on various materials with different termites and/or chemical reactions. Safely-ish, of course.
I think the answer to your question is that that some things are coated with materials that will harm you when you cook on them at a high temperature and eat and/or inhale it. Others will simply melt (expelling fumes you want nothing to do with) or break.
It is chemistry and physics.
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