Abstract: The present invention pertains to glass containing, in terms of mass % on an oxide basis, 40-80% of SiO2, 1-30% of Al2O3, and 1-40% of CaO, the glass having dmisteinbergite as the crystalline phase. Such glass makes it difficult for cracks to progress and has exceptional crack resistance.

Abstract: The present invention pertains to glass containing, in terms of mass % on an oxide basis, 40-80% of SiO2, 1-30% of Al2O3, and 1-40% of CaO, the glass having dmisteinbergite as the crystalline phase. Such glass makes it difficult for cracks to progress and has exceptional crack resistance.

Abstract: To provide a glass plate for display devices wherein without carrying out a post treatment, the depth of a compression stress layer is increased, while the surface compression stress is prevented from being excess only by chemical tempering. A glass plate for display devices, which is obtained by chemically tempering a glass plate comprising, as represented by mol % based on the following oxides, from 50 to 74% of SiO2, from 1 to 10% of Al2O3, from 6 to 14% of Na2O, from 3 to 15% of K2O, from 2 to 15% of MgO, from 0 to 10% of CaO and from 0 to 5% of ZrO2, wherein the total content of SiO2 and Al2O3 is at most 75%, the total content of Na2O and K2O, i.e. Na2O+K2O, is from 12 to 25%, and the total content of MgO and CaO, i.e. MgO+CaO, is from 7 to 15%.

Abstract: To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained. Glass for a data storage medium substrate, which comprises, as represented by mol percentage based on the following oxides, from 55 to 70% of SiO2, from 2.5 to 9% of Al2O3, from 0 to 10% of MgO, from 0 to 7% of CaO, from 0.5 to 10% of SrO, from 0 to 12.5% of BaO, from 0 to 2.5% of TiO2, from 0.5 to 3.7% of ZrO2, from 0 to 2.5% of Li2O, from 0 to 8% of Na2O, from 2 to 8% of K2O and from 0.5 to 5% of La2O3, provided that the total content of Al2O3 and ZrO2 (Al2O3+ZrO2) is at most 12%, and the total content of Li2O, Na2O and K2O (R2O) is at most 12%.

Abstract: To provide a glass plate for display panels which has a low 82O3 content and a low compaction and which can be used as a glass substrate for large TFT panels. A glass plate for display panels, which comprises, as a glass matrix composition as represented by mass % based on oxide: SiO2 50.0 to 73.0, Al2O3 6.0 to 20.0, B2O3 0 to 2.0, MgO 4.2 to 9.0, CaO 0 to 6.0, SrO 0 to 2.0, BaO 0 to 2.0, MgO+CaO+SrO+BaO 6.5 to 11.3, Li2O 0 to 2.0, Na2O 2.0 to 18.0, K2O 0 to 13.0, and Li2O+Na2O+K2O 8.0 to 18.0, and has a heat shrinkage (C) of at most 20 ppm.

Abstract: A glass composition for substrates excellent in productivity is provided by lowering the high temperature viscosity while securing characteristics and quality required for FPD substrates, particularly for PDP substrates. A glass composition for substrates, which is characterized by comprising, as represented by mass% based on oxides, from 55 to 75% of SiO2, from 5 to 15% of Al2O3, from 4 to 18% of MgO, from 3 to 12% of CaO, from 4 to 18% of SrO, from 0 to 20% of BaO, from 6 to 20% of Na2O+K2O, from 0.5 to 6% of ZrO2 and from 18 to 25% of MgO+CaO+SrO+BaO, as a glass matrix composition, and containing from 0.001 to 0.6% of SO3, and which is further characterized in that when the viscosity is represented by ?, the temperature satisfying log?=2 is at most 1,545° C. and the devitrification temperature is at most the temperature satisfying log?=4, the thermal expansion coefficient is from 75×10?7 to 90×10?7/° C., the specific gravity is at most 2.8, and the glass transition point is at least 600° C.

Abstract: A process for producing a glass substrate, which includes forming molten glass obtained by melting raw materials into a glass ribbon in a float bath, annealing the glass ribbon by a cooling apparatus, and cutting the glass ribbon to form the glass substrate, where the hydrogen concentration in the atmosphere of a float bath exceeds 3%, and the glass retention time in the float bath is from 4 to 15 minutes.

Abstract: An electrode for a discharge lamp includes an electrode body configured to emit thermal electrons. The electrode body is formed by a sintered body of a conductive mayenite compound.

Abstract: An electrode for a fluorescent lamp includes a filament and an emitter provided on the filament. The emitter includes a mayenite compound.

Abstract: To provide a glass for an information recording media substrate, which is excellent in weather resistance. A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 11.5 to 17% of Al2O3, from 8 to 16% of Li2O, from 2 to 8% of Na2O, from 2.5 to 8% of K2O, from 0 to 6% of MgO, from 0 to 4% of TiO2 and from 0 to 3% of ZrO2, provided that Al2O3+MgO+TiO2 is at least 12%, and Li2O+Na2O+K2O is from 16 to 23%, wherein in a case of where B2O3 is contained, its content is less than 1%. The above glass for an information recording media substrate, wherein when the glass is left under steam atmosphere at 120° C. at 0.2 MPa for 20 hours, and the amount of Li, the amount of Na and the amount of K, which precipitate on a surface of the glass are represented as CLi, CNa and CK respectively, CNa is at most 0.7 nmol/cm2, and CLi+CNa+CK is at most 3.5 nmol/cm2.

Abstract: The present invention provides a glass substrate for flat panel display in which yellowing occurring in a case of forming silver electrodes on glass substrate surface is inhibited. A glass substrate for flat panel display, which is formed by a float method, which has a composition consisting essentially of, in terms of oxide amount in mass %: SiO2 50 to 72%, Al2O3 0.15 to 15%, MgO + CaO + SrO + BaO 4 to 30%, Na2O more than 0% and at most 10%, K2O 1 to 21%, Li2O 0 to 1%, Na2O + K2O + Li2O 6 to 25%, ZrO2 0 to 10%, and Fe2O3 0.0725 to 0.15%; and wherein the average Fe2+ content in a surface layer of the glass substrate within a depth of 10 ?m from the a top surface is at most 0.0725% in terms of Fe2O3 amount.

Abstract: To provide a glass substrate which has a high glass transition temperature, which has a thermal expansion coefficient close to that of soda lime glass, which has a low specific gravity, which will hardly undergo yellowing, and which further has good melting characters and is thereby produced with high productivity. A glass substrate which has a composition comprising, as represented by mass percentage based on oxides, SiO2 ??55 to 65%, Al2 O3 ??4 to 8%, MgO ??6 to 9%, CaO ?0.1 to 5%, SrO ?0.5 to 6%, BaO ??0 to 2%, MgO + CaO + SrO + BaO ?6.6 to 19%, Na2 O ??0 to 5%, K2 O ?9.5 to 21%, Na2 O + K2 O ??10 to 22%, ZrO2 ?0.5 to 5%, Fe2 O3 0.06 to 0.15%, which has a specific gravity of at most 2.7, which has an average thermal expansion coefficient from 50 to 350° C. of from 80×10?7/° C. to 90×107/° C., which has a glass transition temperature of at least 640° C.

Abstract: The present invention relates to a solar cell comprising a double tube composed of two glass tubes differing in the diameter and a photovoltaic conversion layer formed between the two glass tubes, the double tube being sealed at both ends of a part in which the photovoltaic conversion layer is formed, wherein at least one of the two glass tubes is composed of a glass comprising, in mass % based on the oxides, from 60 to 70% of SiO2, from 4 to 10% of Al2O3, from 0 to 3% of B2O3, from 0 to 4% of MgO, from 2 to 9% of CaO, from 1 to 10% of SrO, from 0 to 2% of BaO, from 10 to 16% of Na2O, from 0 to 5% of K2O, from 0 to 2% of ZrO2 and from 0 to 2% of CeO2.

Abstract: To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained. Glass for a data storage medium substrate, which comprises, as represented by mol percentage based on the following oxides, from 55 to 70% of SiO2, from 2.5 to 9% of Al2O3, from 0 to 10% of MgO, from 0 to 7% of CaO, from 0.5 to 10% of SrO, from 0 to 12.5% of BaO, from 0 to 2.5% of TiO2, from 0.5 to 3.7% of ZrO2, from 0 to 2.5% of Li2O, from 0 to 8% of Na2O, from 2 to 8% of K2O and from 0.5 to 5% of La2O3, provided that the total content of Al2O3 and ZrO2 (Al2O3+ZrO2) is at most 12%, and the total content of Li2O, Na2O and K2O (R2O) is at most 12%.

Abstract: A substrate with film and a glass for forming such a film are provided, wherein the film has high gas barrier property, high transmittance in visible light region, and high productivity since the film provides effective gas barrier property even if the film is a single layer. A substrate with film having an inorganic amorphous film having a softening temperature of from 100 to 800° C. formed on at least one surface of a substrate; or a substrate with film having an inorganic amorphous film having a glass transition temperature of from 50 to 500° C. formed on at least one surface of a substrate. Further, a glass for forming film composed of a borate glass containing B2O3 as the main component, a phosphate glass containing P2O5, a tellurite type composition containing TeO2 as the main component, a bismuth oxide type composition containing Bi2O3 as the main component or a chalcogenide type composition containing at least one type of element selected from the group consisting of S, Se and Te.

Abstract: A float glass for a display substrate, characterized in that its composition consists essentially of, as represented by mass % based on oxide, from 52 to 62% of SiO2, from 5 to 15% of Al2O3, from more than 0% to 9% of MgO, from 3 to 12% of CaO, from 9 to 18% of SrO, from 0 to 13% of BaO, from 25 to 30% of MgO+CaO+SrO+BaO, from 6 to 14% of Na2O+K2O+Li2O, from 0 to 6% of ZrO2 and from 0 to 1% of SO3, the temperature of glass melt corresponding to the viscosity of 102 dPa·s is at most 1,520° C., the temperature of glass melt corresponding to the viscosity of 104 dPa·s is at most 1,120° C., the glass transition temperature is at least 610° C., and the specific gravity is at most 2.9.

Abstract: To provide a glass plate for display panels which has a low 8203 content and a low compaction and which can be used as a glass substrate for large TFT panels. A glass plate for display panels, which comprises, as a glass matrix composition as represented by mass% based on oxide: SiO2 50.0 to 73.0, Al2O3 6.0 to 20.0, B2O3 0 to 2.0, MgO 4.2 to 9.0, CaO 0 to 6.0, SrO 0 to 2.0, BaO 0 to 2.0, MgO+CaO+SrO+BaO 6.5 to 11.3, Li2O 0 to 2.0, Na2O 2.0 to 18.0, K2O 0 to 13.0, and Li2O +Na2O+K2O 8.0 to 18.0, and has a heat shrinkage (C) of at most 20 ppm.

Abstract: To provide a glass for an information recording media substrate, which is excellent in weather resistance. A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 11.5 to 17% of Al2O3, from 8 to 16% of Li2O, from 2 to 8% of Na2O, from 2.5 to 8% of K2O, from 0 to 6% of MgO, from 0 to 4% of TiO2 and from 0 to 3% of ZrO2, provided that Al2O3+MgO+TiO2 is at least 12%, and Li2O+Na2O+K2O is from 16 to 23%, wherein in a case of where B2O3 is contained, its content is less than 1%. The above glass for an information recording media substrate, wherein when the glass is left under steam atmosphere at 120° C. at 0.2 MPa for 20 hours, and the amount of Li, the amount of Na and the amount of K, which precipitate on a surface of the glass are represented as CLi, CNa and CK respectively, CNa is at most 0.7 nmol/cm2, and CLi+CNa+CK is at most 3.5 nmol/cm2.

Abstract: To provide a glass for an information recording media substrate, which is excellent in weather resistance. A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 11.5 to 17% of Al2O3, from 8 to 16% of Li2O, from 2 to 8% of Na2O, from 2.5 to 8% of K2O, from 0 to 6% of MgO, from 0 to 4% of TiO2 and from 0 to 3% of ZrO2, provided that Al2O3+MgO+TiO2 is at least 12%, and Li2O+Na2O+K2O is from 16 to 23%, wherein in a case of where B2O3 is contained, its content is less than 1%. The above glass for an information recording media substrate, wherein when the glass is left under steam atmosphere at 120° C. at 0.2 MPa for 20 hours, and the amount of Li, the amount of Na and the amount of K, which precipitate on a surface of the glass are represented as CLi, CNa and CK respectively, CNa is at most 0.7 nmol/cm2, and CLi+CNa+CK is at most 3.5 nmol/cm2.

Abstract: To provide an alkali-free glass excellent in the properties for glass substrates to be used for display, excellent in the resistance to reduction, and suitable for forming by a float process. An alkali-free glass consisting essentially of, as represented by mol %: SiO2 at least 60% and less than 66%, Al2O3 0 to 12%, B2O3 5 to 10%, MgO 0 to 18%, CaO 0 to 18%, SrO 0 to 18%, BaO 0 to 6%,? CaO + SrO 10 to 25%,? MgO + CaO + SrO + BaO 15.5 to 30%?? and containing substantially no alkali metal oxide.