Polytetrafluoroethylene, in tape form, seal form for commercial and industrial applications, namely, for use in connection with plumbing fixtures, other pipe and valve members, and screws, bolts and nuts by being utilized between the ends to improve the seal there between; for sealing fluid conduits, such as valves or pipes to stop fluid leakage or flow; for sealing leaks in pipes or other conduits by wrapping the material there around or by applying the material thereto; and for sealing joints between fluid paths to prevent leakage; plastic in roll and seal forms, for commercial and industrial applications, namely, for use in connection with sealing containers, bottles or the like, such as by heat shrink-wrapping the material around the container or bottle or portions thereof