<p>[Object] This invention relates to crystal glass article not containing lead or barium that can be chemical strengthened easily and that is highly alkali-resistant and equivalent to lead crystal glass in quality. [Solving Means] Crystal glass article that can be chemical strengthened easily and that is highly alkali-resistant and equivalent to lead crystal glass in quality can be produced with a glass composition containing:
62% to 65% by weight of SiO 2
2% to 3.2% by weight of Al 2 O 3 ;
10% to 12% by weight of Na 2 O;
8% by weight to less than 10.0% by weight of K 2 O;
3% to 4.2% by weight of CaO;
2% to 3.2% by weight of SrO;
6% to 7.2% by weight of ZnO;
2.2% to 3% by weight of TiO 2 ;
0% to 0.4% by weight of Sb 2 O 3 ; and
0% to 1.2% by weight of SnO 2 + Y 2 O 3 + La 2 O 3 + ZrO 2 .</p>
