DESCRIPTION     Elgen’s Shrink Wrap with PSA is a polyethylene film with adhesive. Elgen's Shrink Wrap with PSA is used as an alternative to a polyethylene film that is secured to the duct wall with tape. Elgen's Shrink Wrap with PSA is used on any exposed sections of the duct work. It prevents outside debris from entering the ductwork and contaminating the duct work.