They're not that heat tolerant. They're fantastic heat conductors, but they'll burn away into carbon dioxide (via carbon monoxide). The temperatures needed to d

They're not that heat tolerant. They're fantastic heat conductors, but they'll burn away into carbon dioxide (via carbon monoxide). The temperatures needed to do that are high, around 900C, but that's not that high. Angle grinder sparks can be hotter than 1000C, as can the edges of carbide tools.