A flat glass is provided that exhibits high transmittance to electromagnetic radiation in a range of wavelengths from 200 nm to 1500 nm. The transmittance for the flat glass having a thickness of 1 mm is 20% or more at a wavelength of 254 nm, 82% or more at a wavelength of 300 nm, 90% or more at a wavelength of 350 nm, 92% or more at a wavelength of 546 nm, 92.5% or more at a wavelength of 1400 nm, 91.5% or more in a wavelength range from 380 nm to 780 nm, and 92.5% or more in a wavelength range from 780 nm to 1500 nm.

A method of producing an electronic component is provided. The method includes providing flat glass having a dielectric constant of less than 4.3 and a dielectric loss factor of 0.004 or less at 5 GHz; configuring the flat glass as one of an interposer, a substrate, or a superstrate; and forming the interposer, the substrate, or the superstrate into the electronic component. The electronic component can be an antenna, a patch antenna, an array of antennas, a phase shifter element, and a liquid crystal-based phase shifter element.

Substantially alkali free glasses are disclosed which can be used to produce substrates for flat panel display devices. The glasses can have a loading of fluorine and ceria to achieve exemplary solarization and UV protection attributes when exposed to UV radiation. Methods for producing substantially alkali free glasses using a float or downdraw process (e.g., a fusion downdraw process) are also disclosed.

A UV-transmitting glass formed of a multi-component oxide, and having at least one of characteristics of an internal transmittance ?.sub.350-400 (%) with respect to light having a wavelength between 350 nm and 400 nm through a 10 mm-thick glass that satisfies ?.sub.350-400?90 . . . (1); an internal transmittance ?.sub.300-350 (%) with respect to light having a wavelength between 300 nm and 350 nm through a 10 mm-thick glass that satisfies ?.sub.300-350?75 . . . (2); and an internal transmittance ?.sub.260-300 (%) with respect to light having a wavelength between 260 nm and 300 nm through a 10 mm-thick glass that satisfies ?.sub.260-300?45 . . . (3).

Glasses containing silicon dioxide (SiO.sub.2) and/or boron oxide (B.sub.2O.sub.3) as glass formers and having a refractive index n.sub.d of greater than or equal to 1.7, as measured at 587.56 nm, and a density of less than or equal to 4.5 g/cm.sup.3, as measured at 25? C., are provided. Optionally, the glasses may be characterized by a low optical dispersion, a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum, and/or good glass forming ability.

Glasses containing silicon dioxide (SiO.sub.2) and/or boron oxide (B.sub.2O.sub.3) as glass formers and having a refractive index n.sub.d of greater than or equal to 1.80, as measured at 587.56 nm, a density of less than or equal to 5.5 g/cm.sup.3, as measured at 25? C., and a high transmittance to, particularly to blue light, are provided. Optionally, the glasses may be characterized by a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum and/or good glass forming ability.

Provided is a glass material that can satisfy both a high Faraday effect and a high light transmittance in a short wavelength range. A glass material contains, in % by mole, 30 to 50% Pr.sub.2O.sub.3 and 0.1 to 70% B.sub.2O.sub.3+P.sub.2O.sub.5.

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La.sup.3+ component; more than 0% and up to 75% of a Ga.sup.3+ component; and 5 to 75% of a Nb.sup.5+ component, in which a total amount of the La.sup.3+ component, Ga.sup.3+ component, and Nb.sup.5+ component is 60 to 100%.

An alkali-free glass has a strain point of 650? C. or more, an average coefficient of thermal expansion at 50 to 350? C. of from 30?10.sup.?7 to 45?10.sup.?7/? C., and a temperature T.sub.2 at which a glass viscosity reaches 10.sup.2 dPa.Math.s of from 1,500 to 1,800? C. The alkali-free glass contains, as represented by mol % based on oxides, SiO.sub.2: from 62 to 70%, Al.sub.2O.sub.3: from 9 to 16% B.sub.2O.sub.3: from 0 to 12%, MgO: from 3 to 10%, CaO: from 4 to 12%, SrO: from 0 to 6%, and Fe.sub.2O.sub.3: from 0.001 to 0.04%, provided that MgO+CaO+SrO+BaO is from 12 to 25%. The alkali-free glass has a ?-OH value of from 0.35 to 0.85/mm.

Glasses containing silicon dioxide (SiO.sub.2) and/or boron oxide (B.sub.2O.sub.3) as glass formers and having a refractive index n.sub.d of greater than or equal to 1.7, as measured at 587.56 nm, and a density of less than or equal to 4.5 g/cm.sup.3, as measured at 25? C., are provided. Optionally, the glasses may be characterized by a low optical dispersion, a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum, and/or good glass forming ability.