An electronic-grade glass fiber composition includes the following components with corresponding amounts by weight percentages: 54.2-60% SiO.sub.2, 11-17.5% Al.sub.2O.sub.3, 0.7-4.5% B.sub.2O.sub.3, 18-23.8% CaO, 1-5.5% MgO, less than or equal to 24.8% CaO+MgO, less than 1% Na.sub.2O+K.sub.2O+Li.sub.2O, 0.05-0.8% TiO.sub.2, 0.05-0.7% Fe.sub.2O.sub.3, and 0.01-1.2% F.sub.2. The weight percentage ratio C1=SiO.sub.2/(RO+R.sub.2O) is greater than or equal to 2.20, and the total weight percentage of the above components is greater than or equal to 98.5%.

An alkali-free glass includes, as represented by mol % based on oxides: 50 to 80% of SiO.sub.2; 2 to 6% of Al.sub.2O.sub.3; 18 to 35% of B.sub.2O.sub.3; 1 to 6% of MgO; 0 to 6% of CaO; 0 to 6% of SrO; and 0 to 3% of BaO. A formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 6% or less. A formula (B) is [Al.sub.2O.sub.3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is −3% or more and 2% or less.

A bioactive glass-ceramic composition as defined herein. Also disclosed are methods of making and using the disclosed compositions.

A coated glass or glass ceramic substrate includes a substrate with a surface area and a coating on that surface area. The coating includes a glass matrix and IR-reflecting pigments. The IR-reflecting pigments have a TSR value of at least 20%, as determined according to ASTM G 173. The coating, at a wavelength of 1500 nm, exhibits a remission of at least 35%, as measured according to ISO 13468.

A coated glass or glass ceramic substrate includes a substrate with a surface area and a coating on that surface area. The coating includes a glass matrix and IR-reflecting pigments. The IR-reflecting pigments have a TSR value of at least 20%, as determined according to ASTM G 173. The coating, at a wavelength of 1500 nm, exhibits a remission of at least 35%, as measured according to ISO 13468.

New glass compositions and applications thereof are disclosed. Embodiments of the present invention relate to glass compositions, to fiber glass strands, to chopped fiber glass strands, to nonwoven mats of glass fibers, and to other products and methods. A fiber glass strand comprises a plurality of glass fibers comprising the glass composition of the present invention.

New glass compositions and applications thereof are disclosed. Embodiments of the present invention relate to glass compositions, to fiber glass strands, to chopped fiber glass strands, to nonwoven mats of glass fibers, and to other products and methods. A fiber glass strand comprises a plurality of glass fibers comprising the glass composition of the present invention.

A glass fiber of the present invention includes as a glass composition, in terms of mass %, 45% to 70% of SiO.sub.2, 0% to 20% of Al.sub.2O.sub.3, 10% to 35% of B.sub.2O.sub.3, 88% to 98% of SiO.sub.2+Al.sub.2O.sub.3+B.sub.2O.sub.3, 0% to less than 0.7% of Li.sub.2O+Na.sub.2O+K.sub.2O, 0.1% to 12% of MgO+CaO, 0% to 3% of TiO.sub.2, and 0% to less than 0.8% of F.sub.2, and has a mass ratio CaO/MgO of 1.0 or less.

A glass fiber of the present invention includes as a glass composition, in terms of mass %, 45% to 70% of SiO.sub.2, 0% to 20% of Al.sub.2O.sub.3, 10% to 35% of B.sub.2O.sub.3, 88% to 98% of SiO.sub.2+Al.sub.2O.sub.3+B.sub.2O.sub.3, 0% to less than 0.7% of Li.sub.2O+Na.sub.2O+K.sub.2O, 0.1% to 12% of MgO+CaO, 0% to 3% of TiO.sub.2, and 0% to less than 0.8% of F.sub.2, and has a mass ratio CaO/MgO of 1.0 or less.

Thin glass elements with improved edge strength are provided—from a sheet glass element that has two opposite parallel faces and an edge connecting the faces. The sheet glass element has a thickness of at most 700 μm. At least a portion of the edge is defined by an edge surface portion that is convexly curved, so that at least one of the faces merges into the edge surface portion, wherein a curved arc of the edge surface portion has a length that is at least 1/30 of the thickness of the sheet glass element. In the region of the convex curvature, the edge surface portion has indentations in the form of furrows.