DyPerm Wrap zero-perm vapor retarder sheeting (a barrier) is a three-ply laminate vapor barrier constructed of a 1 mil aluminum foil with 0.5 mil polyester film on both sides. DyPerm Vapor Barrier Wrap is recommended in chilled water and cryogenic pipe insulation and other mechanical insulation applications as part of Dyplast’s insulation system using the ISO-C1 or Phenolic family of insulation. DyPerm Wrap has a zero perm water vapor transmission per ASTM E96 (making it better than a vapor retarder), and has excellent handling and puncture resistance characteristics.
DyPerm Tape is a zero-perm 3-ply vapor barrier tape used to secure DyPerm Wrap seams and can be factory or field applied, although Dyplast generally recommends factory application. DyPerm Tape is made with 1 mil aluminum foil and a 0.5 mil polyester film on both sides. The tape is coated with a cold weather solvent acrylic pressure sensitive adhesive system which combines superior quick stick at normal temperatures and superior low temperature performance below freezing.