This tape is designed to seal insulation jackets for maximum system efficiency. When used during installation or to repair an existing insulation jacket, the tape ensures maximum insulation value for energy efficiency. High performance acrylic adhesive provides an aggressive bond in extreme temperatures (-40F - 212F). Aluminum foil backing provides UV, moisture, mold and mildew resistance. UL 181B-FX Listed. Tears by hand for simple, quick installation. Can contribute toward satisfying EQ credit 4.1 (low emitting materials) under LEED. Professional results that a DIYer can be proud of begins with Water Heater Installation UL Listed Tape by Nashua.