ShurMASTIC® indoor/outdoor mastic on a roll used for air-tight and moisture-free sealing of flexible air duct systems. UL 723 listed. Approved for Subgrade Application on PVC Coated Duct.
ShurMASTIC® butyl foil tape used for airtight and moisture-free sealing of Class 1 Flex Duct, sheet metal and duct wrap vapor barriers, and is also approved for subgrade application on PVC-coated duct. A paintable, UL 181B-FX Listed mastic on a roll for indoor or outdoor use, SF 686 is designed with a butyl rubber adhesive system that can withstand wide temperature variances once applied.
Key Features
- Indoor/outdoor mastic foil tape.
- UL 181B-FX Listed – clearly printed on the tape for quick identification.
- Instant, water-resistant grip to most surfaces.
- Paintable with paint recommended for aluminum.
- Contains no asbestos, CFCs or PCBs.
- Applicable Standards: UL 181B-FX; UL Listed; Pressure Classes SMACNA 1/2, 1, 2, 3, 4 & 6; Seal Classes A, B, C; UL 723.













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