When it comes to HVAC installations, getting the right seal means the difference between efficiency and energy waste. That's why professionals turn to ShurMASTIC butyl foil tape – a heavy-duty solution designed to create permanent, airtight seals that stand up to the toughest conditions.
This isn't your average duct tape. ShurMASTIC SF 686 features a specialized butyl rubber adhesive system that actually improves performance once applied. The adhesive responds to temperature changes, creating an even stronger bond as it settles into place. Whether you're working with flexible ducts, sheet metal joints, or vapor barriers, this tape forms a seal that won't crack, peel, or degrade over time.
UL 181B-FX listed and printed for compliance, this tape meets strict safety standards for HVAC applications. The silver foil backing provides excellent reflectivity while the butyl core ensures maximum adhesion. Once applied, the surface is paintable, so you can customize it to match your installation without worrying about the tape showing through.
From basements to rooftops, this tape performs in both indoor and outdoor settings. The butyl adhesive maintains its grip through wide temperature fluctuations, making it ideal for installations in extreme climates. It's even approved for subgrade applications on PVC-coated duct, giving you confidence that your seals will stay put no matter where they're installed.
Applying ShurMASTIC tape is straightforward – just clean the surface, press firmly, and let the butyl adhesive do its work. The 3" width provides good coverage for most HVAC joints, while the 33.3-yard roll ensures you'll have enough for even larger projects. Once set, you'll have peace of mind knowing your HVAC system is properly sealed against air leaks and moisture infiltration.
