Vapor Bond Tape (TVB4) This white single-sided tape combines a heavy duty, weather-resistant polyethylene backing with an aggressive rubber adhesive. VaporBond Tape offers excellent seaming capabilities for our materials with an “Easy Tear” feature to reduce installation time. TVB4 has a WVTR of 0.18 perms per ASTM D 833. Typical applications include vapor retarders, covers and liners. Available in a 4″ x 210′ roll.