<p>A lithium free boron aluminosilicate glass for manufacturing a chemically toughened glass article which has an effective bond length index (EBI)gi in a range of 1.7≤(EBI)gi≤2.5, preferably 1.5≤(EBI)gi≤2.4 and most preferably 1.9≤(EBI)gi≤2.3. The (EBI)gi index is a measure of glass structure and allows predicting glass properties.</p>
