3M 438 Heavy Duty Aluminum Foil Tape. 3M™ Heavy Duty Aluminum Foil Tape 438 has a transparent acrylic adhesive to use when a heavier weight foil is required. 438 is flame resistant. Meets U.L. 723, Class “L” low flammability rating (File R 7311). The foil backing provides an excellent reflective surface for both heat and light.QUASSI Silver Duct Tape, Professional Heavy Duty Blackout Waterproof Tape for Repair, Strong Flexible Lees x 20 Yards, 3 Rolls HEATIT Aluminum F x 30 feet (10yard Length) Thick 5.3mil (2.4mil foil and 2.9mil Backing Paper) for HVAC, Ducts, Pipes, Metal Repair, Heating Cable WHY CHOOSE LLPT-TAPES?. - Strong adhesive, but residue free after removal. - 3.94 mil thickness on aluminum foil, 3.2 mil thickness on backing liner. - High coefficient of heat transfer, ideal for HVAC, ducting repairs, sealing and masking for oil.We manufacture and distribute a variety of products in custom shapes, colors, and materials. Highly Visible, Heavy Duty Aluminum Foil Base Retro-Reflective Marking TapeThis tape is ideal for marking basketball, pickleball, and tennis courts, as well as, a variety of other applications.