These are not silicone but silicate “glues”. Different chemistry.LM10 wrote: ↑Mon Oct 22, 2018 7:10 pmThere are silicone versions which can withstand up to 1500°C and are being used in blast furnaces. I don't think that such material would be gone before they even left the pit lane.
Silicones start to decompose at high >350C temperatures depending on type and atmosphere. They are however used in applications which might see heat, for instance in an electrical insulation that might get burned, reason being is that if they burn the ash is non conductive and may prevent shorts (so then it is one time only).
For wheel rims I guess an ordinary epoxy or silicone glue might suffice. If the temperatures really get high then you quickly get out of reach of polymeric systems and you better go to a pyro putty, perhaps metal filled, like the ones on the aremco site. They are not that great, it feels like sticking things together with mud, but if you don’t have to worry about mechanical loads then they work fine.