Spiral silicon carbide heating elements with high-density, high use temperature, ... . sic rod , 2. Diameter, 8-90mm, 3. Length, 240-4000mm.Spiral SiC Rod Features:1. Withstands as high as 1500°C ... (mm)max.300300300400500700700800800COOL ZONE (mm)250300300400450160160160160COOL ZONE (mm) Min.250300300404040404040 Spiral Silicon carbide heating elements