Methods for producing glass articles from laminated glass tubing include introducing the glass tubing to a converter. The glass tubing includes a core layer under tensile stress, an outer clad layer under, and an inner clad layer. The methods include forming a feature the glass article at a working end of the laminated glass tubing and separating a glass article from the working end of the laminated glass tubing, which may expose the core layer under tensile stress at the working end of the glass tubing. The method further comprises remediating the exposed portion of the core layer by completely enclosing the core layer in a clad layer. Systems for re-cladding the exposed portion of the core layer as well as glass articles made using the systems and methods are also disclosed.

The embodiments described herein relate to chemically and mechanically durable glass compositions and glass articles formed from the same. In an embodiment the glass composition may include from about 67 mol. % to about 80 mol. % SiO.sub.2; from about 3 mol. % to about 13 mol. % alkaline earth oxide; from about 2 mol. % to about 10 mol. % Al.sub.2O.sub.3; from about 2 mol. % to about 18 mol. % alkali oxide, wherein the alkali oxide comprises non-zero amounts of Na.sub.2O; from 0 mol. % to about 4 mol. % B.sub.2O.sub.3; and from about 0.01 mol. % to about 1 mol. % of a fining agent.

The embodiments described herein relate to chemically and mechanically durable glass compositions and glass articles formed from the same. In an embodiment the glass composition may include from about 67 mol. % to about 80 mol. % SiO.sub.2; from about 3 mol. % to about 13 mol. % alkaline earth oxide; from about 2 mol. % to about 10 mol. % Al.sub.2O.sub.3; from about 2 mol. % to about 18 mol. % alkali oxide, wherein the alkali oxide comprises non-zero amounts of Na.sub.2O; from 0 mol. % to about 4 mol. % B.sub.2O.sub.3; and from about 0.01 mol. % to about 1 mol. % of a fining agent.

The invention discloses a borosilicate glass with high chemical resistance and an application thereof. The borosilicate glass contains 0.25-4.0 wt % of Y.sub.2O.sub.3 based on the oxide. The borosilicate glass has a high chemical stability, a suitable linear thermal expansion coefficient and is suitable for use in the field of pharmaceutical packaging materials.

The invention discloses a borosilicate glass with high chemical resistance and an application thereof. The borosilicate glass contains 0.25-4.0 wt % of Y.sub.2O.sub.3 based on the oxide. The borosilicate glass has a high chemical stability, a suitable linear thermal expansion coefficient and is suitable for use in the field of pharmaceutical packaging materials.

A household glassware product manufactured from soda-lime-silica glass cullet includes at most 5% by weight of ZnO and at least 95% by weight of the soda-lime-silica glass cullet selected from the group consisting of recycling glass cullet, internal glass cullet, and a mixture of the recycling glass cullet and the internal glass cullet.

Ion-exchanged glass ceramic articles described herein have a stress that decreases with increasing distance according to a substantially linear function from a depth of about 0.07 t to a depth of about 0.26 t from the outer surface of the ion-exchanged glass ceramic article from a compressive stress to a tensile stress. The stress transitions from the compressive stress to the tensile stress at a depth of from about 0.18 t to about 0.25 t from the outer surface of the ion-exchanged glass ceramic article. An absolute value of a maximum compressive stress at the outer surface of the ion-exchanged glass article is from 1.8 to 2.2 times an absolute value of a maximum central tension (CT) of the ion-exchanged glass article, and the glass ceramic article has a fracture toughness of 1 MPa√m or more as measured according to the double cantilever beam method.

A glass article may include SiO.sub.2, Al.sub.2O.sub.3, B.sub.2O.sub.3, at least one alkali oxide, and at least one alkaline earth oxide. The glass article may be capable of being strengthened by ion exchange. The glass article has a thickness t. The concentration(s) of the constituent components of the glass may be such that: 13≤0.0308543*(188.5+((23.84*Al.sub.2O.sub.3)+(−16.97*B.sub.2O.sub.3)+(69.10*Na.sub.2O)+(−213.3*K.sub.2O))+((Na.sub.2O−7.274)*(−7.3628)+(Al.sub.2O.sub.3−2.863)*(K.sub.2O−0.520)*(321.5)+(B.sub.2O.sub.3−9.668)*(K.sub.2O−0.520)*(−39.74)))/t.

An alkali-free glass includes, as represented by mole percentage based on oxides, SiO.sub.2: 57 to 70%, Al.sub.2O.sub.3: 5 to 15%, B.sub.2O.sub.3: 15 to 24%, MgO: 0.2 to 10%, CaO: 0.1 to 7%, SrO: 0.1 to 2.5%, BaO: 0 to 10%, and ZnO: 0 to 0.1%, or includes, as represented by mole percentage based on oxides, SiO.sub.2: 57 to 70%, Al.sub.2O.sub.3: 5 to 15%, B.sub.2O.sub.3: 15 to 24%, MgO: 0.1 to 10%, CaO: 0.1 to 10%, SrO: 0.1 to 10%, BaO: 0.1 to 10%, and ZnO: 0 to 0.1%. Formula (A) is [Al.sub.2O.sub.3]/[B.sub.2O.sub.3], and a value of the formula (A) is larger than 0.35 and 1.4 or smaller.

The invention relates to glass articles, such as for example glass tubes or flat glasses, where the material at the surface by a targeted process control has gradient material properties which in turn result in a compressive prestress of the surface. The invention also relates to a method for the production of the glass articles as well as their use.