Glass article

摘要

A noble glass composition which is based on a known potassium-zinc crystal glass composition suitable for chemical strengthening, in which most of contained ZnO component is replaced with a combination of less expensive oxides. The noble glass composition is easily melted in a tank and formed by machine into table wares, and provides a chemical strengthened crystal glass article which has high practical strength as tableware and can be subjected to washing with an alkali.

主权项

1. A glass article formed from a glass containing
a total of 10 percent by weight or more of potassium oxide K2O and zinc oxide ZnO, substantially containing neither lead oxide PbO nor barium oxide BaO, and having the following glass composition comprising: SiO2 in a content of more than 65 percent by weight and 70 percent by weight or less; Al2O3 in a content of 1 percent by weight or more and 3 percent by weight or less; Na2O in a content of 8 percent by weight or more and less than 10 percent by weight; K2O in a content of 8 percent by weight or more and 9.9 percent by weight or less; MgO in a content of 2 percent by weight or more and 3 percent by weight or less; CaO in a content of 3 percent by weight or more and 4.2 percent by weight or less; SrO in a content of more than 3.2 percent by weight and less than 4.2 percent by weight; ZnO in a content of 0.5 percent by weight or more and 2 percent by weight or less; TiO2 in a content of 0.5 percent by weight or more and 2 percent by weight or less; Sb2O3 in a content of 0 percent by weight or more and 0.4 percent by weight or less; and one or more of SnO2, Y2O3, La2O3, and ZrO2 in a total content of 0 percent by weight or more and 1.2 percent by weight or less.