Abstract: Embodiments are directed to strengthened glass articles comprising a thickness t?1 mm (1000 ?m), an inner region under a central tension CT (in MPa), and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL (in ?m), wherein the strengthened glass article is under a compressive stress at the surface CSs (in MPa), wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, and at least 3 mol % Al2O3, and wherein the DOL?70 ?m, and a CSs/DOL ratio?2.5 MPa/?m.

Abstract: Embodiments are directed to strengthened glass articles comprising a thickness t?1 mm (1000 ?m), an inner region under a central tension CT (in MPa), and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL (in ?m), wherein the strengthened glass article is under a compressive stress at the surface CSs (in MPa), wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol % Li2O, and at least 3 mol % Al2O3, and wherein the DOL?70 ?m, and a CSs/DOL ratio?2.5 MPa/?m.

Abstract: This invention is directed to a method and system for removing ash, particularly a heat-treated ash deposit from a filter. At least a majority (e.g., greater than 50 wt %) of the ash is removed as a result of the process. The filter containing the ash deposit is contacted with an acid composition to remove a majority of the ash, and the acid-contacted filter is then treated to remove at least a portion of the acid.