W.F. Lake has you covered. For thermal welding applications look to our L-series of PTFE coated tapes and fabrics. PTFE coated fiberglass provides excellent heat transfers with no sticking to your sealing surfaces. Looking for a more durable option? Ask about our L30 series of 2 ply Kevlar belts. Designed to fit over your heat-sealing bar, our 2 ply belts are durable and easily replaceable.