Thermal Gap Filler Pads Würth Elektronik Thermal Gap Filler Pads conduct heat between contact surfaces and provide electrical isolation. These filler pads are customizable in shape and feature a soft design that allows the pads to conform to non-flat surfaces. The WE-TGF series offers low thermal resistance, high electrical insulation, and are self-adhesive. Würth Elektronik Thermal Gap Filler Pads are ideal for power electronics, audio and TV, and communication applications.