Pencil Heater

A pencil heater is a compact, high-watt-density cartridge heating element designed in a slim cylindrical form for precise localized heating. It is inserted into drilled holes in metal blocks or components to provide uniform and controlled heat in confined spaces. Pencil heaters are widely used in plastic molding dies, packaging machinery, medical devices, hot runner systems, and laboratory equipment. Typical technical features include stainless steel sheath construction, high insulation resistance, fast heat-up time, operating temperatures up to several hundred degrees Celsius, and availability in various diameters, lengths, and power ratings to suit industrial applications.