Bharat Heaters Cartridge Heaters are used where localised heating is required. Cartridge heaters are used as in Dies, Moulds and Platens including machinery. Bharat Heaters manufacture Cartridge Heater in different sizes and sheathing material as per requirement. Standard Bharat Heaters Cartridge heaters are not intended for immersion, but we make suitable Immersion Cartridge heater also. Bharat Heaters High Density Cartridge Heater’s heating coil is wound around a ceramic core & isolated from the outer sheet through layer of highly compressed MGO.