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.
- Indoor/outdoor mastic foil tape
- Stays supple and forms a permanent bond to substrate
- Paintable with paint recommended for aluminum;
- Contains no asbestos, CFCs or PCBs