Micaflat Heaters. Mica heaters are best used on flat surfaces requiring heating where silicone or film heaters are not suitable for temperatures above 160 °C. These heaters must be temperature controlled and fitted correctly for best performance. Flat mica plate heaters are used in applications as e.g.: Dies, Platens, Moulds, Tanks, Process Machinery. Constructed by winding resistance wire Insulated and terminal connections fitted Encased in Zintec sheet which gives good mechanical strength and protection High temperature surface heating up to 260 °C