Ideal for Flexible HVAC Duct Work We constructed 3M™ Metallized Flexible Duct Tape 3350 with a 1.6 mil polypropylene foil backing and a strong, pressure sensitive cold weather acrylic adhesive with a temperature range of -40°F (-40°C) to 185°F (85°C). This tape is flame, moisture, UV and chemical resistant and is commonly used for sealing flexible ducts and connector systems in residential and commercial construction. Recommended Applications Sealing of flexible air ducts and air connectors Protects, Seals and Repairs Tough and versatile, with a wide range of unique characteristics, 3M™ Foil Tapes are indispensable on the jobsite. From sealing ducts and reflective insulation and repairing air connectors, roofs, gutters and flashing to creating vapor barriers in extreme temperature applications -- no toolbox should be without them. Bringing Better Ideas to the Surface through Science and Innovation In the 3M Industrial Adhesives and Tapes Division, they apply the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, their technologies help customers like you deliver competitive products to the market faster and more efficiently.