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 an ultraviolet to infrared range and is less susceptible to breakage. A Li.sub.2O—Al.sub.2O.sub.3—SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% SiO.sub.2, 1 to 10% Li.sub.2O, 5 to 30% Al.sub.2O.sub.3, 0 to 20% SnO.sub.2, over 0 to 20% ZrO.sub.2, 0 to below 2% TiO.sub.2, 0 to 10% MgO, and 0 to 10% P.sub.2O.sub.5 and includes a β-spodumene solid solution precipitated as a main crystalline phase.

A glass composition includes a base glass portion comprising: 65-75 wt % SiO.sub.2; 5-15 wt % CaO; 0-5 wt % MgO; 0-5 wt % K.sub.2O; 10-14 wt % Na.sub.2O; and 1-5 wt % Al.sub.2O.sub.3; wherein the glass composition has a ratio of Na.sub.2O to Al.sub.2O.sub.3 is in the range of 9.5-12.5 wt %/wt %.

The present invention relates to an ultraviolet-shielding glass sheet including a glass composition based on soda-lime glass, the glass composition containing iron oxide and TiO.sub.2 as coloring components. The glass sheet has a thickness of 1 to 5 mm, and an ultraviolet transmittance (Tuv 380) as determined at the thickness according to ISO 9050:1990 is 1.5% or less.

A glass-ceramic includes glass and crystalline phases, where the crystalline phase includes non-stoichiometric suboxides of titanium, forming ‘bronze’-type solid state defect structures in which vacancies are occupied with dopant cations.

The present invention relates to an ultraviolet-shielding glass sheet including a glass composition based on soda-lime glass, the glass composition containing iron oxide and TiO.sub.2 as coloring components. The glass sheet has a thickness of 1 to 5 mm, and an ultraviolet transmittance (Tuv 380) as determined at the thickness according to ISO 9050:1990 is 1.5% or less.

Embodiments relate to a green glass composition, which can reduce the cooling load of a building and a vehicle by effectively lowering solar heat ray and ultraviolet ray transmittance while ensuring a high visible light transmittance suitable for window glass without using a coloring agent such as Ce, Co and Cr, and also has excellent bubble quality; green glass manufactured therefrom; and a method for manufacturing green glass. According to at least one embodiment, there is provided a green glass composition including 0.65-1.3 wt % of Fe.sub.2O.sub.3, 0.1-0.4 wt % of TiO.sub.2, and 0.05-0.20 wt % of SO.sub.3, based on 100 wt % of a soda lime mother glass composition, wherein an oxidation-reduction ratio of Fe.sub.2O.sub.3 is 0.22 to 0.38.

Disclosed is a type of borosilicate glass, the composition of which, based on oxides, contains the following components by weight percentage (wt %): 2.0 wt %-5.0 wt % of TiO.sub.2, 0.25 wt %-2.5 wt % of CeO.sub.2 and 0.25 wt %-3.0 wt % of Y.sub.2O.sub.3, and does not contain any iron compound, such as ferric oxide. The glass has better UV resistance and alkaline resistance properties, and a better light transmission rate, and is particularly suitable for use in the field of pharmaceutical packaging materials.

A glass-ceramic includes glass and crystalline phases, where the crystalline phase includes non-stoichiometric suboxides of titanium, forming ‘bronze’-type solid state defect structures in which vacancies are occupied with dopant cations.

The present invention provides a glass sheet having a good property of blocking transmission of ultraviolet light, having a low to moderate visible transmittance, being relatively thin, being capable of substantially blocking transmission of solar ultraviolet light, and also having a good solar shielding property. The glass sheet of the present invention has a thickness of 1 to 5 mm, a Tuv 380 of 1.5% or less, a Tuv 400 of 2.5% or less, a visible transmittance (YA) of 5 to 40%, and a solar transmittance (TG) of 5 to 45%, and is formed from a glass composition, wherein the glass composition includes: 1.0 to 5.0 wt % T-Fe.sub.2O.sub.3; 1.0 to 5.0 wt % TiO.sub.2; and 50 to 600 wt. ppm CoO as coloring components in addition to predetermined base composition, a FeO ratio is 5 to 40%, and the sum of T-Fe.sub.2O.sub.3 multiplied by 2 and TiO.sub.2 is 7.0% or more.

The present invention relates to a black quartz glass consisting of a composition comprising 63 to 65 mass % of SiO.sub.2, 18 to 24 mass % of TiO.sub.2, and 12 to 17 mass % of Al.sub.2O.sub.3, wherein the sum of SiO.sub.2, TiO.sub.2 and Al.sub.2O.sub.3 is 100 mass %; and to a method for producing black quartz glass comprising: mixing 63 to 65 mass % of a SiO.sub.2 powder, 18 to 24 mass % of a TiO.sub.2 powder and 12 to 17 mass % of an Al.sub.2O.sub.3 powder, filling the mixed powder into a mold and then melting at a maximum temperature of 1700 to 1900 C. in an oxygen-free atmosphere, and cooling to room temperature to obtain the black quartz glass; and further to a product comprising a black quartz glass member made of the black quartz glass. The present invention allows to provide a black quartz glass which has an excellent light-shielding property, has no risk of causing contamination in a step of using it, has sufficient color uniformity when the size is enlarged, and is capable of producing a large ingot, and to provide a method for producing the black quartz glass with excellent productivity even in the large ingot, and to provide a black quartz glass product made of the black quartz glass.