Abstract: A glass that is ion exchangeable to a depth of at least 20 ?m (microns) and has a internal region having a tension of less than or equal to 100 MPa. The glass is quenched or fast cooled from a first temperature above the anneal point of the glass to a second temperature that is below the strain point of the glass. In one embodiment, the glass is a silicate glass, such as an alkali silicate glass, an alkali aluminosilicate glass, an aluminosilicate glass, a borosilicate glass, an alkali aluminogermanate glass, an alkali germanate glass, an alkali gallogermanate glass, and combinations thereof.

Abstract: Provided are a glass substrate for information recording media wherein air bubbles can be sufficiently removed, and an information recording medium using the glass substrate. The glass substrate contains 65 to 90 mass % of SiO2+Al2O3+B2O3 (where SiO2 is 45 to 75 mass %, Al2O3 is 1 to 20 mass %, and B2O3 is 0 to 8 mass %), 7 to 20 mass % of R2O (where R represents Li, Na, or K), 0.1 to 12 mass % of R?O (where R? represents Mg, Ca, Sr, Ba, or Zn), and 0.5 to 10 mass % of TiO2+ZrO2. Moreover, the glass substrate contains at least one multivalent element selected from among a group consisting of V, Mn, Ni, Mo, Sn, Ce, and Bi; the molar ratio of the total amount of the oxide of the multivalent element to the total amount of TiO2+ZrO2 is within the range of 0.05 to 0.50.

Abstract: Disclosed are a glass substrate for an information recording medium, having excellent scratch resistance and a light weight and having high fracture toughness, the glass substrate having a fragility index value, measured in water, of 12 ?m?1/2 or less or having a fragility index value, measured in an atmosphere having a dew point of ?5° C. or lower, of 7 ?m?1/2 or less, or the glass substrate comprising, by mol %, 40 to 75% of SiO2, 2 to 45% of B2O3 and/or Al2O3 and 0 to 40% of R?2O in which R? is at least one member selected from the group consisting of Li, Na and K), wherein the total content of SiO2, B2O3, Al2O3 and R?2O is at least 90 mol %, and a magnetic information recording medium comprising a magnetic recording layer formed on the glass substrate.

Abstract: The invention provides an alkali-free glass substrate small in the variation of the thermal shrinkage and a process for producing the same. An alkali-free glass substrate of the invention has an absolute value of a thermal shrinkage of 50 ppm or more when the alkali-free glass substrate is heated at a rate of 10° C./min from a room temperature, kept at a holding temperature of 450° C. for 10 hr and then cooled at a rate of 10° C./min.

Abstract: In the present invention, ceramic particles are used as an optical diffusible filler. The present invention provides an optical diffusible material containing ceramic particles, wherein the ceramic particles satisfy the following requirements (I) and (II): (I) the total amount of Al2O3 or MgO and SiO2 is 80% by weight or more; and (II) the weight ratio of Al2O3 or MgO to SiO2 ((Al2O3 or MgO)/SiO2) is 0.1 to 15.

Abstract: A cover glass having a compressive-stress layer on the principal surfaces thereof, and having a glass composition containing 50% to 70% by mole of SiO2, 3% to 20% by mole of Al2O3, 5% to 25% by mole of Na2O, more than 0% by mole and less than or equal to 2.5% by mole of Li2O, 0% to 5.5% by mole of K2O, and 0% to less than 3% by mole of B2O3. Also disclosed is a method for producing a cover glass which includes: (i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate; and (iii) forming a compressive-stress layer on the surface of the glass substrate.

Abstract: Embodiments of the present invention provides fiberizable glass compositions formed from batch compositions comprising amounts of one or more glassy minerals, including perlite and/or pumice.

Abstract: The invention relates to a glass ceramic comprising article, wherein the integral, non-post-processed and non-reworked glass ceramic comprising article comprises at least three different types of microstructures. The microstructures differ in the number and/or size of the crystallites contained per unit volume, and/or in the composition of the crystallites, and/or in the composition of the residual glass phases. The different microstructures are characterized by different relative ion content profiles across a cross-section perpendicular to the transition areas. The relative ion content profiles are determined from intensities which are determined using secondary ion mass spectrometry, and each of the three different types of microstructures preferably has different intensity plateaus for individual ions, wherein the individual ions are components of the main crystal phases.

Abstract: A tempered glass substrate used for a cover glass of a display has a compression stress layer on a surface thereof, and has a glass composition comprising, in terms of mass %, 40 to 71% of SiO2, 3 to 21% of Al2O3, 0 to 1% of Li2O, 7 to 20% of Na2O, 0 to 15% of K2O, 0 to 3% of SrO, 0.001 to 10% of ZrO2, and 0 to 4% of TiO2, wherein K2O/Na2O in terms of mass fraction is 0.25 to 2.

Abstract: A clad glass composition that is excellent in devitrification resistance and that prevents the whole mother glass rod from devitrifying by preventing a core glass composition from devitrifying in forming a mother glass rod using a concentric crucible drawing method, is provided. The clad glass composition forms a clad of a mother glass rod for a gradient-index rod lens having a core/clad structure.

Abstract: The present disclosure relates to glass articles for use as a touchscreen substrate for use in a portable electronic device, particularly comprising an alkali-free aluminosilicate glass exhibiting a high damage threshold of at least 1000gf, as measured by the lack of the presence of median/radial cracks when a load is applied to the glass using a Vickers indenter, a scratch resistance of at least 900gf, as measured by the lack of the presence of lateral cracks when a load is applied by a moving Knoop indenter and a linear coefficient of thermal expansion (CTE) over the temperature range 0-300° C. which satisfies the relationship: 25×10?7/° C.?CTE?40×10?7/° C.

Abstract: A compositional range of high strain point alkali metal free, silicate, aluminosilicate and boroaluminosilicate glasses are described herein. The glasses can be used as substrates for photovoltaic devices, for example, thin film photovoltaic devices such as CIGS photovoltaic devices. These glasses can be characterized as having strain points ?570° C., thermal expansion coefficient of from 5 to 9 ppm/° C.

Abstract: The present disclosure relates to glass articles for use as a touchscreen substrate or cover glass article for use in a portable electronic device, particularly an aluminoborosilicate glass being substantially free of alkalis, comprising at least 55 mol % SiO2, at least 5 mol % Al2O3 and at least one alkaline earth RO component. The alkali-free aluminoborosilicate exhibits an Al2O3+B2O3 to RO mol % ratio which exceeds 1 and an Al2O3 to RO mol % ratio which exceeds 0.65. The aluminoborosilicate glasses disclosed herein exhibits high damage resistance as evidenced by a Vickers median/radial crack initiation load which is greater than than 1000 gf, as well as a high scratch resistance of at least 900 gf, as measured by the lack of the presence of lateral cracks when a load is applied by a moving Knoop indenter.

Abstract: The invention relates to glass articles suitable for use as electronic device housing/enclosure or protective cover which comprise a glass material. Particularly, a housing/enclosure/cover comprising an ion-exchanged glass exhibiting the following attributes (1) radio, and microwave frequency transparency, as defined by a loss tangent of less than 0.03 and at a frequency range of between 15 MHz to 3.0 GHz; (2) infrared transparency; (3) a fracture toughness of greater than 0.6 MPa·m1/2; (4) a 4-point bend strength of greater than 350 MPa; (5) a Vickers hardness of at least 450 kgf/mm2 and a Vickers median/radial crack initiation threshold of at least 5 kgf, (6) a Young's Modulus ranging between about 50 to 100 GPa; (7) a thermal conductivity of less than 2.0 W/m° C., and (9) and at least one of the following attributes: (i) a compressive surface layer having a depth of layer (DOL) greater and a compressive stress greater than 400 MPa, or, (ii) a central tension of more than 20 MPa.

Abstract: The glass-metal bond for a tube collector includes a glass tube and metal part bonded to the glass tube. In order to match the thermal expansion properties, the glass tube has the following composition: SiO2, 73-77 wt. %; B2O3, 6-<8 wt. %; Al2O3, 6-6.5 wt. %; Na2O, 5.5-7 wt. %; K2O, 1-3 wt. %; CaO, 0.5-3.2 wt. %; MgO, 0-2 wt. %; Fe2O3, 50-150 ppm; and TiO2 0-<100 ppm. The ratio of the sum of the alkaline-earth metal oxides (in mol %) to the sum of the alkali metal oxides (in mol %) is ?0.6. The metal part is preferably made of metal material no. 1.3981 according to DIN 17745. The glass composition itself is also part of the invention.

Abstract: An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass comprising, denoted as molar percentages, 56 to 75 percent of SiO2, 1 to 11 percent of Al2O3, more than 0 percent but equal to or less than 4 percent of Li2O, equal to or more than 1 percent but less than 15 percent of Na2O, equal to or more than 0 percent but less than 3 percent of K2O, and substantially no BaO, with a total content of Li2O, Na2O, and K2O falling within a range of 6 to 15 percent, with a molar ratio (Li2O/Na2O) being less than 0.50, with a molar ratio {K2O/(Li2O+Na2O+K2O)} being equal to or less than 0.13, with a total content of MgO, CaO, and SrO falling within a range of 10 to 30 percent, with a total content of MgO and CaO falling within a range of 10 to 30 percent, with a molar ratio {(MgO+CaO)/(MgO+CaO+SrO)} being equal to or more than 0.

Abstract: A glass for an information recording medium substrate, which comprises, as represented by mol % based on the following oxides, from 61 to 72% of SiO2, from 3 to 11% of Al2O3, from 0 to 14.3% of Li2O, from 0 to 22% of Na2O, from 0 to 22% of K2O, from 4 to 13% of MgO, from 0 to 6% of TiO2 and from 0 to 5% of ZrO2, provided that the total content of Li2O, Na2O and K2O (R2O) is from 10 to 22%, and (a) the ratio of the content of Li2O to R2O (Li2O/R2O) is at most 0.52, (b) the ratio of the content of Na2O to R2O (Na2O/R2O) is at least 0.35, or (c) the ratio of the content of K2O to R2O (K2O/R2O) is at least 0.45.

Abstract: A tempered glass substrate of the present invention is a tempered glass substrate, which has a compression stress layer on a surface thereof, and has a glass composition comprising, in terms of mass %, 40 to 71% of SiO2, 3 to 21% of Al2O3, 0 to 3.5% of Li2O, 7 to 20% of Na2O, and 0 to 15% of K2O.

Abstract: The subject of the invention is a method of refining glass for which the temperature (T log 2) corresponding to a viscosity of 100 poise (10 Pa·s) is greater than or equal to 1480° C., characterized in that sulfides are used as a refining agent. It also relates to the glass article capable of being obtained by this method.

Abstract: Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.54 to about 1.58 and a high X-ray opacity with an aluminum equivalent thickness of at least about 500% are provided. Such glasses are based on a SiO2—B2O3—Al2O3—R2O—RO—La2O3—ZrO2 system with optional additions of SnO2. Such glasses may be used, in particular, as dental glasses or as optical glasses.

Abstract: To provide glass to be used for a substrate which is, as a substrate, less susceptible to surface roughening even if subjected to cleaning by means of a strongly acidic solution. Glass for a substrate, which comprises, as represented by mol % based on the following oxides, from 62.5 to 69% of SiO2, from 9 to 15.5% of Al2O3, from 8 to 16 of Li2O, from 0 to 8% of Na2O, from 0 to 7% of K2O and from 0 to 3.5% of ZrO2, provided that SiO2—Al2O3 is at least 53.3%, Li2O+Na2O+K2O is from 17 to 24%, and the total of contents of the above six components is at least 97%.

Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Abstract: A fining agent for reducing the concentration of seeds or bubbles in a silicate glass. The fining agent includes at least one inorganic compound, such as a hydrate or a hydroxide that acts as a source of water. In one embodiment, the fining agent further includes at least one multivalent metal oxide and, optionally, an oxidizer. A fusion formable and ion exchangeable silicate glass having a seed concentration of less than about 1 seed/cm3 is also provided. Methods of reducing the seed concentration of a silicate glass, and a method of making a silicate glass having a seed concentration of less than about 1 seed/cm3 are also described.

Abstract: A method for fabricating a glass substrate containing SiO2 as a main ingredient thereof for an information recording medium which ensures removal of abrasive or foreign mater adhered to the glass substrate without complicating a cleaning step, involves, after a polishing step, keeping the surface of the glass substrate in contact with a liquid having a Si element elution in a range from 100 to 10 000 ppb/mm2 before a scrub-cleaning step.

Abstract: A glass composition which is reduced in the amount of residual bubbles and is produced using smaller amounts of an environmentally unfriendly component such as arsenic oxide and antimony oxide. This glass composition contains, in terms of mass %: 40-70% SiO2; 5-20% B2O3; 10.25% Al2O3; 0-10% MgO; 0-20% CaO; 0-20% SrO; 0-10% BaO; 0-0.5% Li2O; 0-1.0% Na2O; 0-1.5% K2O; and 0-1.5%, excluding 0%, Cl, Li2O+Na2O+K2O exceeding 0.06%. The glass composition can be produced suitably using, for example, a chloride as part of the raw glass materials.

Abstract: The present invention relates to a method of refining lithium aluminosilicate glass capable of being controllably ceramized and free of arsenic oxide, antimony oxide and tin oxide, in which at least 0.05% by weight of at least one sulfide is added to the glass batch materials and said materials are melted at a temperature below 1750° C. The invention also relates to the glass-ceramics obtained from said colored glass, especially glass colored by vanadium oxide, and cooktops and cooking utensils including such glass-ceramics.

Abstract: There is provided a glass member for optical parts that represents a greater absolute value |?n| of refractive index difference ?n of visual light between base glass and heterogeneous phase region. In the glass member for optical parts, the heterogeneous phase region distinguishable by a different refractive index is formed at an intended location inside a glass by focused irradiation of a pulsed laser. When a multicomponent optical glass of SiO2, Rn2+RO, and TiO2 is used, |?n| of no less than 0.005 can be attained under a lower irradiation intensity. It is suitable for optical parts such as optical low-pass filters, diffractive optical parts, optical diffusion parts, optical filters, lenses and microlens arrays.

Abstract: A fining agent for reducing the concentration of seeds or bubbles in a silicate glass. The fining agent includes at least one inorganic compound, such as a hydrate or a hydroxide that acts as a source of water. In one embodiment, the fining agent further includes at least one multivalent metal oxide and, optionally, an oxidizer. A fusion formable and ion exchangeable silicate glass having a seed concentration of less than about 1 seed/cm3 is also provided. Methods of reducing the seed concentration of a silicate glass, and a method of making a silicate glass having a seed concentration of less than about 1 seed/cm3 are also described.

Abstract: Mineral materials selected from lithium aluminosilicate glasses containing vanadium, precursors of glass-ceramics, and glass-ceramics colored by vanadium contain solid solution(s) of ?-quartz and/or ?-spodumene as main crystalline phase. Also disclosed are articles made from said mineral materials, as well as methods for forming said glasses, glass-ceramics and articles of said glasses and glass-ceramics. Methods involve optimizing the refining of lithium aluminosilicate glasses containing SnO2 as a fining agent in preparing glasses or glass-ceramics.

Abstract: An integrated dental porcelain system for making dental prostheses and restorations is provided. The system includes three universal major components: a) opaque porcelain composition; b) pressable dentin ingot; and c) veneering porcelain composition that can be used interchangeably for making restorations. Techniques for making the prostheses and restorations include porcelain fused-to-metal (PFM), press-to-metal (PTM), and either pressed and/or machined all-ceramic methods. The system uses both a hand-layering of veneering porcelain (PFM technique) and a hot-pressing process (PTM and all-ceramic technique) to fabricate the prostheses and restorations.

Abstract: According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO2 and Al2O3, where SiO2 content is equal to or greater than 50 percent and Al2O3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li2O, Na2O and K2O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO2, HfO2, Nb2O5, Ta2O5, La2O3 Y2O3 and TiO2; with the molar ratio of the total content of Li2O, Na2O and K2O to the total content of SiO2, Al2O3, ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3 and TiO2 ((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) being equal to or less than 0.28.

Abstract: To provide a glass plate for a substrate, which contains no B2O3 and which can be used as a glass plate for an LCD panel. A glass plate for a substrate, which contains substantially no B2O3, which comprises, as a glass matrix composition as represented by mass % based on oxide of SiO2: 68 to 80, Al2O3: 0.1 to 5, MgO: 9.5 to 12, CaO+SrO+BaO: 0 to 2, and Na2O+K2O: 12.5 to 15.5, and which has a density of at most 2.5 g/cm3, an average coefficient of thermal expansion from 50 to 350° C. of from more than 75×10?7/° C. to at most 87×10?7/° C., a glass transition point of at least 560° C. and a brittleness of at most 6.5 ?m?1/2.

Abstract: A process for producing a wipe-proof anti-reflection layer on a borosilicate glass body is described, in which the borosilicate glass body is coated with a coating solution having a composition of 1-6% by weight of HCl, 0.5-7% by weight of SiO2 sol (solids content), 0.5-5% by weight of H2O, and 85-98% by weight of a readily volatile water-soluble organic solvent. The borosilicate glass body that is to be coated contains, in % by weight based on oxide content: 63-76 of SiO2, >11-20 of B2O3, 1-9 of Al2O3, 3-12 of alkali metal oxide(s), 0-10 of alkaline earth metal oxide(s), 0-2 of ZnO, 0-5 of TiO2, 0-1 of ZrO2, 0-1 of Nb2O5, and 0-1 of WO3.

Abstract: Glass for a display device, which comprises, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO2, from 8 to 17% of Al2O3, from 6 to 18% of Li2O, from 2 to 15% of Na2O, from 0 to 8% of K2O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO2, and from 0 to 2.5% of ZrO2, and having a total content R2O of Li2O, Na2O and K2 O of from 15 to 25%, a ratio Li2O/R2O of the Li2O content to R2O of from 0.35 to 0.8, and a total content of MgO and CaO of from 0 to 9%.

Abstract: A strengthened glass article having a central tension that is below a threshold value above which the glass exhibits frangible behavior. The central tension varies non-linearly with the thickness of the glass. The glass article may be used as cover plates or windows for portable or mobile electronic devices such as cellular phones, music players, information terminal (IT) devices, including laptop computers, and the like.

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: An aircraft transparency in a glass piece, wherein the glass piece includes a chemically tempered first major surface and a chemically tempered opposite second major surface, a first case depth begins at the first major surface, a second case depth begins at the second major surface, and a tensile stress zone is within the glass piece between the end points of the first and the second case depths. The glass between the end points of the first and second case depth has a glass composition including: Ingredient Percent by weight SiO2 60 to 75; Al2O3 18 to 28; and Li2O 3 to 9, and the glass has at least one of the following properties (a) a log 10 viscosity temperature of at least 1413° F. and (b) a liquidus temperature of at least 2436° F.

Abstract: A method is described for making a float glass convertible into a glass ceramic, by which a largely crystal fault-free glass can be produced. In this method the glass is cooled from a temperature (TKGmax), at which a crystal growth rate is at a maximum value (KGmax), to another temperature (TUEG), at which practically no more crystal growth occurs, with a cooling rate, KR, in ° C. min?1 according to: KR UEG KGmax ? ? ? ? T UEG KGmax 100 · KGmax , wherein ?T=TKGmax?TUEG, and KGmax=maximum crystal growth rate in ?m min?1. The float glass has a thickness below an equilibrium thickness, a net width of at least 1 m and has no more than 50 crystals with a size of more than 50 ?m, especially no crystals with a size of more than 10 ?m, per kilogram of glass within the net width.

Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Abstract: The invention relates to producing continuous organic fibers by stretching from molten minerals. These fibers can be used for producing heat resistant threads, rovings, cut fibers, fabrics, composite materials and products based thereon. The inventive glass has the following chemical composition in mass percentage: 15.9-18.1 Al2O3, 0.75-1.2 TiO2, 7.51-9.53 Fe2O3+FeO, 6.41-8.95 CaO, 2.5-6.4 MgO, 1.6-2.72 K2O, 3.3-4.1 Na2O, 0.23-0.5 P2O5, 0.02-0.15 SO3, 0.12-0.21 MnO, 0.05-0.19 BaO, impurities up to 1.0, the rest being SiO2. The inventive method consists in loading a ground composition in a melting furnace, in melting said composition, in homogenizing a melt, in consequently stabilizing the melt in the melting furnace feeder, in drawing and oiling the fiber and in winding it on a spool. Prior to loading, the composition is held in an alkali solution for 15-20 minutes, and is then washed with flowing water for 20-30 minutes and dried.

Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.

Abstract: A glass composition is provided for the production of high temperature glass fibers with oxides comprising 1% to 15% Fe2O3+FeO as a fluidizer to lower liquidous temperature and the fiberizing temperature of a mix of high temperature oxides. The glass composition has therein an appropriate content of high temperature oxides to produce glass fiber with high temperature limits and high burn-through properties.

Abstract: A glass composition which contains Ce ions as a component substantially comprises, in terms of oxides, SiO2: 55 to 75 wt %, B2O3: 6 to 25 wt %, CeO2: 0.01 to 5 wt %, SnO: 0.01 to 5 wt %, Al2O3: 0 to 10 wt %, Li2O: 0 to 10 wt %, Na2O: 0 to 10 wt %, K2O: 0 to 10 wt %, MgO: 0 to 5 wt %, CaO: 0 to 10 wt %, SrO: 0 to 10 wt %, BaO 0 to 10 wt %, TiO2: 0 to 1.0 wt %, Fe2O3: 0.01 to 0.2 wt %, Sb2O3: 0 to 5 wt %, ZrO2: 0.01 to 5 wt %. By having such constituents, the glass composition is capable of suppressing transmission of ultraviolet light and solarization, and thus the glass composition hardly suffers from initial coloring or coloring during lamp production.

Abstract: An LAS-type float glass, which is substantially free of As2O3 and/or Sb2O3 and precipitates a ?-quartz solid solution or a ?-spodumene solid solution as a main crystal by heat treatment, wherein, when C1 [mass %] represents the content of SnO2 at a glass surface, C0 [mass %] represents the content of SnO2 at a depth of 0.5 mm from the glass surface, and k [mass %/mm] represents an SnO2 concentration gradient defined by k=(C1-C0)/0.5, the LAS-type crystallized glass satisfies relationships of K?2 and C0?0.8 with respect to at least one surface thereof.

Abstract: A glass for use in chemical reinforcement for use in a substrate of an information recording medium, having a composition comprising, denoted as mol %: SiO2 47 to 70%? Al2O3 1 to 10% (where the total of SiO2 and Al2O3 is 57 to 80%) CaO 2 to 25% BaO 1 to 15% Na2O 1 to 10% K2O 0 to 15% (where the total of Na2O and K2O is 3 to 16%) ZrO2 1 to 12% MgO 0 to 10% SrO 0 to 15% (where the ratio of the content of CaO to the total of MgO, CaO, SrO, and BaO is greater than or equal to 0.5) ZnO 0 to 10% (where the total of MgO, CaO, SrO, BaO, and ZnO is 3 to 30%) TiO2 0 to 10% and the total content of the above-stated components is greater than or equal to 95%.

Abstract: To provide a substrate for information recording medium having various properties, in particular higher fracture toughness, required for application of the substrate for information recording medium of the next generation such as perpendicular magnetic recording system, etc. and a material with excellent workability for such purpose. A crystallized glass substrate for information recording medium, consisting of a crystallized glass which comprises one or more selected from RAl2O4 and R2TiO4 as a main crystal phase, in which R is one or more selected from Zn, Mg and Fe, and in which the main crystal phase has a crystal grain size in a range of from 0.5 nm to 20 nm, a degree of crystallinity of 15% or less, and a specific gravity of 3.00 or less.

Abstract: A glass plate for a substrate, which contains no B2O3, and which can be as a glass plate for an LCD panel, which comprises, as a glass matrix composition as represented by mass % based on oxide of SiO2: 68 to 80, Al2O3: 0.1 to 5, MgO: 9.5 to 12, CaO+SrO+BaO: 0 to 2, and Na2O+K2O 6 to 14, and which has a density of at most 2.45 g/cm3, an average coefficient of thermal expansion from 50 to 350° C. of at most 75×10?7/° C., a glass transition point of at least 600° C. and a brittleness of at most 6.5 ?m?1/2.

Abstract: The borosilicate glass for pharmaceutical packaging has a transmission ? in the visible range of more than 80% at a wavelength of 400 nm, a transmission ? in the UV range of at most 0.1% at wavelengths under 260 nm (each at a sample thickness of 1 mm), a transformation temperature Tg of 550° C. to 590° C. and a processing temperature VA of 1100° C. to 1200° C. The glass has a composition, in wt. % on an oxide basis, of SiO2, 60-80; B2O3, 5-15; Al2O3, 2-10; TiO2, 0.5-7; ? Li2O+K2O+Na2O, 3-10; ? alkaline earth oxides, 0.5-10; ZrO2, 0-3; and Fe2O3, 0-0.2. The glass is suitable for packaging UV-sensitive substances but nevertheless permits optical quality control.

Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which comprises, denoted as molar percentages, 50 to 75 percent of SiO2, 0 to 5 percent of Al2O3, 0 to 3 percent of Li2O, 0 to 5 percent of ZnO, a total of Na2O and K2O of 3 to 15 percent, a total of MgO, CaO, SrO, and BaO of 14 to 35 percent, a total of ZrO2, TiO2, La2O3, Y2O3, Yb2O3, Ta2O5, Nb2O5, and HfO2 of 2 to 9 percent, with a molar ratio of {(MgO+CaO)/(MgO+CaO+SrO+BaO)} falling within a range of 0.85 to 1, and a molar ratio of {Al2O3/(MgO+CaO)} falling within a range of 0 to 0.30.

Abstract: Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs). The glass compositions possess numerous properties that are compatible with the downdraw process, particularly fusion drawing.