Safe-Gard Top Tabbed one piece facings are secure induction inner seals that provide for ease of removal.

After you induction seal the liner onto a container, remove the liner and look at the underside. Pay particular attention to the area just inside of the land area and under the paper tab to see if it shows signs of being overheated. The paper tab insulates the foil and seal layers, causing the foil and sealing film to get hotter than the other half of the liner where there is no paper. If the PET film under the aluminum foil becomes overheated and degrades, it may allow the contents in the container to attack and destroy the aluminum foil.

For polyester film to have pin holes, it has seen temperature over 500°F. At the time of induction sealing the electromagnetic field in the induction head heats up the aluminum foil. The heat starts at the outside edge of the liner and works its way to the center. The surface of the liner that is in contact with the land area and the closure, acts as a heat sink and moderates the temperature in that contact area to approximately 350°F/400°. The area just inside of the land area where there isn't anything touching the liner to act as a heat sink, will get much hotter. If the power is set too high on the induction equipment, the sealing film and polyester next to the aluminum will be overheated and possibly melt.

The polyester and sealing film laminated to the aluminum foil are the only protection against corrosion of the aluminum foil.