Hxtal NYL-1TMis prepared by mixing 3 weight parts of resin to 1weight part of hardener according to the suggestion of the manufac-turer. The weighting was performed with a Mettler Toledo AG285balance with accuracy ± 0.0001 g into a plastic container, made by ahigh-density polyethylene. Part A and B were homogenously mixedby stirring at room temperature for 60 s and subsequently weredegassed.Polyester films of 0.1 mm thick with a rectangular space holeof 3 × 5 cm were placed between two slides of glass (5 mm thick)covered with polypropylene sheets. Then, a drop of the glue wastransferred in the middle of the hole and “sandwiched”, takingcare not to entrap air bubbles while the glass plates were joined