I guess this another thing I don’t understand about karts coming from a car racing (mostly crew) experience. For reference, iron rotors start to glow about 930F. That’s just starting to get hot.
This is why I don’t understand the purpose of ventilated rotors on a tiny kart. There is so little mass to stop compared with the surface area. Warm to hot with racing brakes is good (cold is BAD). So long as the pads are in the window, the main differences between them are how aggressive they grab, leaving it somewhat up to driver preference so long as they will last the race distance.
I know CRG sells some different colored pads, but I can’t find anything that provides any information like you would find with pads for any other motor sports showing temperature vs coefficient of friction (Mu), such as this graph for Hawk pads.
Even though my electric kart will be quite heavy, with both front and rear non ventilated rotors I don’t see how I would ever need anything more. I’d say that kart pads are just crazy soft, yet mine hardly wore during an entire season with the 80cc shifter (only rear brake).