Whatâ??s the Silicon Carbide(Sic) heating element? The SiC electrothermal element is a rod-shaped non-metallic thermoelectric element which is made of high quality green SiC as the main raw material through processing, high temperature silicification and recrystallization. Compared with metallic electric heating elements, this element has the characteristics of high operating temperature, oxidation resistance, corrosion resistance, long service life, small deformation, convenient installation and maintenance.