an improved plastic bag sealing apparatus comprised of an improved heater formed of a heating wire embedded in a silicon rubber material . the heater is shaped to conform to the flat planar surface of a t - bar shaped heating element , and clamped in place with insulators to provide maximum transfer of heat to the heating edge formed by the web portion of the t - bar . the containment of heat and transfer of maximum heat to the t - bar permits a substantial improvement in thermal efficiency and a substantial reduction of power consumption . the heating edge of the t - bar is covered with an easily replaceable heating channel coated with a non - stick , heat resistant material such as polytetraflouroethylene .