Mica band heaters For every form of cylinder and barrel heating e.g. injection moulding and extrusion machines, blow moulding etc, For drum heating and other circular tanks. May be supplied to heat internal diameters. Standard mica band heaters are supplied as one piece units with integral clamping. Nozzle heaters may be supplied fully sealed against ingress of plastic material. All band heaters are manufactured with a smooth pressure formed finish to avoid hot spots.