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the gasket from the sheet or film, since substantial waste is avoided and there is more control over the gasket dimensions in a singlestep process. Another advantage of the one-step process is achieving lower gasket thickness (from abour 5 mils to about 50 mils, 0.127 mm to 1.27 mm). Two mechanisms are believed to be occurring which provide a better formulation for abrasionresistant surfaces. The first is enhanced slip performance on the surface, and the second is a more puncture-resistant surface. For this latter mechanism, using a microscope and a metal probe, the puncture resistance of the surface on a series of closure liners is observed. The surface of closure liners (containing SurlynTM 1702) does not break until rhe probe penetrates about 4 mils (0.1 mm) into the liner. Conversely, the surface of closure liners without any ethylene/carboxylic acid in the formulation will break almost immediately on penetration.
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