Description
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.