Lead-free glass composition having properties similar to lead crystal glass

摘要

A glass composition is disclosed wherein the density and the refraction index and the dispersion value of light are equal to or higher than those of conventional lead-containing crystal glass while no lead is contained therein at all. The glass composition comprises 50 to 60% by weight of SiO2, 5 to 13% by weight of K2O, 5 to 8% by weight of TiO2, 10 to 15% by weight of BaO, 5 to 10% by weight of ZnO, 3 to 10% by weight of Na2O, 1 to 5% by weight of CaO, and 0.3 to 0.8% by weight of Sb2O3.