Mastic can soften with heat, cement based products don't at least until you reach a certain point, then they can fail and turn to dust! That's REALLY hot, though. You really want something designed for this purpose, and a generic tile isn't it! FWIW, I've owned a couple of TecInfrared grills, the surface temperature of those can get over 1,000-degrees. The one I have now uses what looks like a glass cooktop on top of the burner (the grill sits on the glass), and that glass gets red hot - it literally glows in the dark...now, that's hot. It is designed to handle the extreme heat, a generic tile isn't.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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