THS-400 16" Wide Direct Heat Foot Sealer & Bag Sealer w/ 15mm Mesh Seal from ABC Office Seal many different types of thermoplastic materials including: coated aluminum foil, Kraft paper, cellophane, polypropylene, poly-nylon, and other thicker materials. Ideal for coffee roasters. Can seal material up to 20mil in total thickness. Both jaws are heated simultaneously for better heat penetration to seal thicker materials Heat sealers may not be returned.