This type also has a spiral groove engraved on the heating zones similar to type SG. This has the cold end only at one end, which is its distinguishing feature. As the connecting terminals are at the one side, it is very convenient to use and moreover an energy saving furnace can be built by using this. Use of the types SG and SGR is recommended for the applications where service conditions are severer or where the temperature in the furnace chamber exceeds 1400°C.
