If you mean the little bits that shock off, I think they would cool enough on the way down, but I would check with the manufacturer about flammability, or maybe float a small piece in a metal or ceramic dish, and heat a rod and push it down on the foam/rubber/? and see what happens, to see what you are dealing with in case of dropping larger amounts of hot glass.
This is all just supposition on my part though, I am not an expert by any means.
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