Abstract: A lead-free glass, which is suitable for use as imitation lead crystal tableware and decorative crystal glassware, has a chemical composition as a percentage by weight within the following range: silica 50-58 zirconium oxide 0-5 potash (K2O) 0-13, e.g. 0-12 yttrium oxide 0-5 soda (Na2O) 0-9 alumina 0-3 lithium oxide 0-4 tin oxide 0-5 calcium oxide 0-3 lanthanum oxide 0-9 magnesium oxide 0-4 niobium oxide 0-9 boric anhydride (B2O3) 0-2 bismuth oxide 0-13, e.g. 0-12 zinc oxide 16-30 germanium oxide 0-5 barium oxide 0-13, e.g. 0-12 antimony oxide 0-1 titanium oxide 0-6.

Abstract: A method and device for cutting hollow glass articles (1) by laser, comprising a first stage in which an incision is made along the circumferential cutting line in the articles, which are rotating about their axis. The article is rotated about its axis. The incision is made by a focused laser beam (3). The article, simultaneously with the incision, is blasted in correpondence with the irradiated point by a pressurized jet of a fluid for cooling and cleaning the incision channel.