ShurMASTIC® indoor/outdoor mastic on a roll used for air-tight and moisture-free sealing of flexible air duct systems. UL 723 classified.
ShurMASTIC® butyl foil tape for indoor or outdoor use to seal Class 1 Flex Duct, sheet metal and duct wrap vapor barriers, and is also approved for subgrade application on PVC-coated duct. SF 685 is a linered, paintable foil mastic on a roll that’s tested in accordance with UL 723 and delivers permanent, airtight and water-resistant seals in temperatures up to 200 F.
Key Features
- Indoor/outdoor mastic foil tape.
- Linered.
- Stays supple and forms a permanent bond to substrate.
- Paintable with paint recommended for aluminum.
- Contains no asbestos, CFCs or PCBs.
- Applicable Standards: FSI 20/SDI 40; Pressure Classes SMACNA 1/2, 1, 2, 3, 4 & 6; Seal Classes A, B, C; UL 723.










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