About Butyl rubber: The Super Waterproof Tape is commonly known as foil tape. These tapes come with Butyl rubber that is extruded, ever-tacky pressure-sensitive sealant with good adhesion strength. They can form an instant seal against water, air or dust, remain permanently soft. They are ideal for filling gaps sealing joints such as those on bolt-on duct flanges circular ducts in HVAC systems, air-conditioner casings, roofing cladding systems, caravan roofs panels, automotive windscreen tail lights, glass metal. PRODUCT FEATURES: Resistant to chemicals, heat, weather High tack cold weather adhesive. Excellent insulation property, fireproof. Excellent adherence even in low temperature. Blocks out moisture odors. Water UV resistant. Multi-application:Super Waterproof Tape is applicable in electrical, HVAC construction industries. The tape is specially used where moisture chemical resistance, thermal conductivity, flame resistance, heat light reflectance is required. These tapes can withst different weather conditions. Tips: Because of the strong stickiness, please wear gloves to prevent h from sticking. In winter, it's better to use a hair dryer to heat the tape before installation. Do not peel off it after applying within 24 hours. Do not use it with other waterproof material including benzene, benzene, ethylene, silicone etc. SPECIFICATIONS: Material: aluminum foil, butyl rubber Size: 2 in 16.4 ft, 4 in 16.4 ft, 6 in 16.4 f PACKAGE INCLUDES: 1 Super Waterproof Tape