Abstract: A heating device for use in injection molding includes an insulating device that has a wear resistant layer of titanium or a titanium alloy to provide a relatively low coefficient of thermal conductivity; and an insulating layer of mica. The wear resistant layer to be arranged on the inside and/or outside of the insulating layer. Whether the wear resistant layer is arranged on the outside, inside, or both outside and inside, depends on the respective field of application. By the use of the materials titanium/titanium alloy and mica, a heating device with good insulation values can be produced in a very compact construction. Because of its high wear resistance, the heating device will also have a long service life.