Dumbbell heating elements consist of a hot zone with high electrical resistivity
and are rigidly connected with two thickened cold ends of low resistance owing to
their larger diameter and special manufacturing technique. The particular connecting
technique ensures perfect mechanical and electrical operation. The hot zones
and cold ends are made of exceptionally homogeneous, self-bonded silicon carbide.

The SD elements are manufactured in a range of 8 to 45mm in hot zone diameter, 150
to 3,000mm in hot zone length and 300 to 4,500mm in total length. The heating
rods are self-supported and can be installed vertically or horizontally. The tables
list standard rod dimensions.

If necessary, rods with other hot zone and/or cold end lengths can be manufactured
upon customer's requests.