A few months back this happened to me and I reported it as a bug but it is still around so have fun.
When you bring a gas up above the liquidation temperature of an insulation tile instead of it melting it just flakes off 5kg worth of igneous rock. This very quickly breaks off large amounts of rock pieces from the insulation but doesn't damage the insulation at all. It also cools down the gas.
I had made insulation tiles out of sedimentary rock since I didn't have any other use for i