Cartridge heaters are cylindrical heating elements that have been utilised since long in various and sundry industrial applications. These tend to consist of a resistance wire that is wound around a ceramic or stainless-steel core, which is then encased in a metal sheath. Such heaters are inserted into a hole or a cavity so as to provide direct heat. Cartridge heaters are quite versatile heating elements that are primarily utilised in those industrial applications wherein localized heat is required. Such types of heaters come in various diameters as well as different lengths and are typically inserted into a hole or cavity. These are commonly used in moulds, dies, packaging equipment, and other such industrial processes.