Shurtape AF 100 UL 181A-P/B-FX Listed/Printed Aluminum Foil HVAC Tape with EasyPeel Paper Liner, HVAC Joint Sealing Tape, 2.5" x 60 Yards, Silver, 1 Roll (155206) Printed aluminum foil tape with EasyPeel paper liner Paper Release Liner: 6.8 mils thick with liner; 4.2 mils thick without liner Excellent adhesion to rigid fiberglass duct board and flexible air duct Flexible and easy to use to create airtight bonds with Acrylic based adhesive Superior stability during extreme fluctuations in temperature from -20 to 260 degrees Fahrenheit and in humid conditions