Polyken/Nashua 338 FSK Insulation Tape is a Foil, Scrim, Kraft laminate tape coated with a synthetic rubber adhesive suitable for used to seal and patch FSK duct boards and blankets. Provides extra strength seal to maintain vapor barrier integrity; like for cooler/refrigeration applications. it is specially designed to meet high strength, tear resistant sealing tape requirements. Provides excellent adhesion to substrate over wide temperature range. Diamond pattern matches most FSK boards and blankets.