A glass composition comprises a germanosilicate glass containing 5-35 mol % ZnO. The glass composition has a relatively high refractive index, good glass-forming ability, and UV-shielding properties.

A glass includes SiO.sub.2 in an amount of at least 60.0 wt.-% and an amount of WO.sub.3 from 0.1 ppm to 60.0 ppm. Tungsten is present in such oxidation states that a transmittance of the glass at a wavelength of 260 nm is at least 75.0%.

A glass includes SiO.sub.2 in an amount of at least 60.0 wt.-% and an amount of MoO.sub.3 from 0.1 ppm to 30.0 ppm. Molybdenum is present in such oxidation states that a transmittance at a wavelength of 260 nm is at least 65.0% at a reference thickness of 1.0 mm.

Embodiments are directed to glass articles which are resistant to UV photodarkening, the glass articles having a thickness ≤1.3 mm and comprise UV absorbers such as Ti, V, Mn, Fe, Cu, Ce, Ge, Mo, Cr, Co and Ni, and combinations thereof, or alternatively comprising ZnO or SnO.sub.2.

Provided is an ultraviolet-radiation absorbing glass product, characterized by: having a transmittance of ultraviolet radiation (TUV), as specified by ISO 9050: 2003, of 2% or less at a plate thickness of 3.5 mm, and transmittance of visible light (TVA) of 8 to 28% inclusive, based on the Standard Illuminant A at a plate thickness of 3.5 mm; and the color of the glass, as denoted by the chromaticity coordinates x, y in the XYZ color coordinate system based on a 2-degree visual field of the Standard Illuminant C as specified by JIS Z8701: 1999, satisfying the following expressions (1) and (2). (1) y≥−0.735×x+0.544 (2) y≥1.389×x−0.089

A glass includes the following components in the specified proportions (in % by weight): 50-80% SiO.sub.2, 2-30% B.sub.2O.sub.3, 0-5% Al.sub.2O.sub.3, 0-10% CaO, 0-10% BaO, 0-5% Li.sub.2O, 0-20% Na.sub.2O, 1-25% K.sub.2O, and 5-30% ΣR.sub.2O. R.sub.2O includes at least one alkali metal oxide. The glass includes at least one first solarization component and at least one second solarization component. A proportion of the first solarization component in the glass is in a range from 0.01 to <1.0 ppm (by weight) and a proportion of the second solarization component in the glass is in a range from 1000 to 10,000 ppm (by weight).

Provided is a glass material having a high light transmittance in a short wavelength range and easily producible. A glass material contains, in terms of % by mole, 5 to less than 30% Pr.sub.2O.sub.3 and 0.1 to 95% B.sub.2O.sub.3.

Embodiments are directed to glass articles which are resistant to UV photodarkening, the glass articles having a thickness ≤1.3 mm and comprise UV absorbers such as Ti, V, Mn, Fe, Cu, Ce, Ge, Mo, Cr, Co and Ni, and combinations thereof, or alternatively comprising ZnO or SnO.sub.2.

Optically transparent glass ceramic materials comprising a glass phase containing and a crystalline tungsten bronze phase comprising nanoparticles and having the formula M.sub.xWO.sub.3, where M includes at least one H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0<x<1. Aluminosilicate and zinc-bismuth-borate glasses comprising at least one of Sm.sub.2O.sub.3, Pr.sub.2O.sub.3, and Er.sub.2O.sub.3 are also provided.

Provided is a Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass that has a high permeability to light in a ultraviolet to infrared range and is less likely to be broken. A Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% Si.sub.O2, 5 to 30% Al.sub.2O.sub.3, 1 to 10% Li.sub.2O, 0 to 20% SnO.sub.2, 0 to 5% ZrO.sub.2, 0 to 10% MgO, 0 to 10% P.sub.2O.sub.5, and 0 to 4% TiO.sub.2 and a mass ratio of Li.sub.2O/(MgO+CaO+SrO+BaO+Na.sub.2O+K.sub.2O) is 3 or less.