B-Tape is a permanently flexible, soft gum tape that is suitable for indoor and outdoor applications. It will not harden, crack, chalk, or cold flow when exposed to high temperatures. It also has a excellent cold temperature adhesion.- Excellent Cold Temperature Adhesion- All Weather Formulation- Exceeds Flange Manufacturer Requirements- UL Classified- Seals Low, Medium, and High Pressure Flanged HVAC Duct Systems