Shurtape SF-682 Shurflex HVAC Metalized Duct Tape is a contractor-grade cloth duct tape used in the HVAC industry to seam, connect, splice, patch and seal sheet metal and flex duct, rigid duct boards, air vents, insulation, fibrous filter banks and pollution collection systems. It can also be used for waterproof packaging. benefits of the tape include: waterproof backing; provides moisture free, air tight seal; flexible and conformable; easy unwind; hand tearable; no release liner to discard (linerless); and the tape color/appearance is designed to match sheet metal, flex duct and duct board. The metallic coating put on the tape gives it a chrome-like look and feel.