Perfect PerformanceOur aluminum butyl super waterproof seal duct tape is 1.2mm Thickness x 4" Width x 16.4' Length ( 1.5MM x 10CM x 5M ) Working Temperature: -40 to 248 , Elongation rate of 1000%, stop the leak effectively aging resistance for 30 years. . Durable MaterialHeavy duty seal tape is made of pure butyl rubber with upgraded aluminum foil cover, added with non-woven fabric and anti-aging film, and the corrosion resistance and anti-aging effect were stronger. Thicker and heavier than similar products, stronger adhesive, toxic-free, high density waterproof, UV resistant, vapor prevent, anti-aging and odorlessProvides a better sealing result and longer service time. . Powerful FeaturesStrong viscosity persistence and high peel strength.It can maintain flexibility & adhesion, withstand a certain degree of displacement, and deformation. . Great reflective heat insulation effect, the use of small grid corrosion-resistant aluminum foil film, plus thick viscose on indoor heat insulation, cooling and noise reduction, reducing the load operation of indoor air conditioning. . Widely ApplicationButyl tape suitable for roof leaks, window sealing, rv awning, gutters, down spouts, boats, personal watercrafts, canoes, outdoor equipment, mobile homes, RVS & campers, PVC & plumbing pipes, sprinkler systems, doors, walls, seams, vents, air ducts, HVAC systems, DIY projects, EPDM Rubber Roof Patching, etc. . Easy To Use: Before attaching the tape, keep the target surface clean, dry and oil-free. Peel off the released film and then apply thebutyl sealant tape to anywhere needed.For better performance, tightly press the tape to a clean and dry surface is advised store in cool place. No need to do Extra Waterproof Coating, you will find it is EASY and EFFICIENT. .