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Electric sealed mica band heater suitable for heating cylindrical shapes with a nominal Ø of 40 mm, up to a maximum temperature of 350 °C, in a humid environment, in the presence of grease, plastic or molten rubber. The band heater consists of a heating wire or tape insulated by 2 mica plates. The sealed shielding is provided by a brass profile. Clamping device by screw. With a power of 225 W / 230 V 1P, it is loaded to 4,5 W/cm2. Output by flexible metal braid protecting the 2 power supply wires and a ground wire, 1 m long.