Coil heaters are typically used in area which has a higher watt density requirement. The Basic construction of these heaters involves swaging of compacted MgO, Nickel Chromium wire into a Chrome Nickel steel tube. These heaters when swaged to provide maximum support for the resistance wire, eliminating the effects of vibration and shock.
Nozzle coil heaters are similar to the coil heaters but with a bigger cross section and the option of brass collet and clamping band over the heater to ensure perfect snug fit onto the nozzle for the efficient heat transformation. The problem of material spillage results in frequent failure of mica nozzle heaters, where as these heaters are robust in such conditions.
Micro tubular coil heaters are manufactured in round and rectangle cross sections, in round section available diameters are 1.5mm, 1.8mm. In rectangle cross section size is 1.3mm x 2.1mm. These heaters are swaged and compacted to these diameters and fitted into special clamps to tighten over circular parts for heating purpose.