Abstract: The invention is a glass for electric lamps comprising SiO.sub.2, A1.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, BaO, MgO, CaO, ZnO, B.sub.2 O.sub.3, TiO.sub.2, SbO.sub.3, MnO.sub.2 and one or more of the following Fe.sub.2 O.sub.3, As.sub.2 O.sub.3 and CeO.sub.2, whereZnO is 3 to 7 weight %,B.sub.2 O.sub.3 is 3 to 8 weight %,TiO.sub.2 is 0 to 1.5 weight %,Al.sub.2 O.sub.3 is 0.3 to 2.5 weight %,BaO is 1 to 4.5 weight %,CaO is 2 to 4.5 weight %,MgO is 0.5 to 3.7 weight %, andthe sum of ZnO and B.sub.2 O.sub.3 is equal to at least 8.6 weight % to provide stability of the glass.

Abstract: The invention pertains to a new lead-free glass composition with improved properties, a glass frit of this composition and its use for the production of glass-enamel, particularly for architectural glass. The glass composition contains in mole %:______________________________________ Na.sub.2 O 10-15 K.sub.2 O 0.1-2 SiO.sub.2 40-50 B.sub.2 O.sub.3 8-12 TiO.sub.2 4-7 Al.sub.2 O.sub.3 0.1-3 ZnO 13-17 F 1-5 ______________________________________and less than 0.5 weight % each of the oxides of the series PbO, CdO, P.sub.2 O.sub.5, and alkaline earth metal oxides. Use of a dye preparation containing the glass frit at 600.degree. to 650.degree. C. results in bakeable glazed, crack-free, acid and base resistant enamel layers.

Abstract: The present invention relates to an unleaded durable transparent vitreous glass composition comprising a combination of(a) up to 98 wt % of a low alumina alkali borosilicate,(b) 2-20 wt % of a major addition of one element selected from the group of zirconium, tin and titanium, and(c) less than 10 wt % of at least one element selected from bismuth, barium, strontium, zinc, lanthanum, molybdenum, cerium and/or a fluoride containing inorganic compound wherein the amounts of (a), (b) and (c) are calculated on the basis of the total amount of the oxide forms of (a), (b) and (c),a process for its production and the use of said composition.

Abstract: A hermetically sealed implantable medical device is provided with a multi-pin arrangement including selected glass to metal or ceramic to metal seals for a feedthrough of the compression seal or matched seal type.

Abstract: In order to provide an alkali-free glass substrate which contains substantially no alkali metal oxide, which has chemical resistance, a high strain point, and excellent meltability and formability, and which has a density of 2.6 g/cm.sup.3 or less, the alkali-free glass substrate contains substantially no alkali metal oxide and essentially consists, by weight, of 50.0-57.9% Sio.sub.2, 10.0-25.0% Al.sub.2 O.sub.3, 3.0-12.0% B.sub.2 O.sub.3, 0-2.0% MgO, 0-10.0% CaO, 0.1-5.0% BaO, 0.1-15.0% SrO, 0-5.0% ZnO, 0-5.0% ZrO.sub.2, and 0-5.0% TiO.sub.2.

Abstract: The invention relates to glass substrates intended for use as a support in data storage units, reinforced by surface ion exchanges and whose matrix comprises the constituents given hereinafter in the following weight proportions:______________________________________ SiO.sub.2 45-65% Al.sub.2 O.sub.3 0-20% B.sub.2 O.sub.3 0-5% Na.sub.2 O 4-12% K.sub.2 O 3.5-12% MgO 0-8% CaO 0-13% ZrO.sub.2 0-20% ______________________________________the sum of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and ZrO.sub.2 remaining equal to or below 70%, said composition optionally incorporating the oxides BaO and/or SrO in proportions 11%.ltoreq.MgO+CaO+BaO+SrO.ltoreq.24% and the alkaline oxides are introduced in the following weight percentages 0.22%.ltoreq.Na.sub.2 O/Na.sub.2 O+K.sub.2 O.ltoreq.0.60.

Abstract: An alkali-free aluminoborosilicate glass preferably with a thermal expansion .alpha..sub.20/300 of about 3.7 .times.10.sup.-6 /K, an annealing temperature OKP of above 700.degree. C., a treatment temperature V.sub.A of less than 1220.degree. C., and very good chemical stability, which can be produced in a float unit and has the following composition (in % by weight based on oxide): SiO.sub.2 52-62; B.sub.2 O.sub.3 4-14; Al.sub.2 O.sub.3 12-20; MgO 0-8; CaO 4-11; BaO 0-2; ZnO 2-8; ZrO.sub.2 0-2; SnO.sub.2 0-2. The ratio of Al.sub.2 O.sub.3 /B.sub.2 O.sub.3 is preferably equal to or greater than 3. The glass is especially suitable for use in display technology.

Abstract: Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .phi. of between 0.3 and 0.5 N/(mm.sup.2 .times.K), a glass transition temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .phi. multiplied by (Tg -20.degree. C.) of between 180 and 360 N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dpas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 107.sup.7.6 dpas) of over 830.degree. C.

Abstract: A borosilicate glass composition comprising 55-67 mol % of SiO.sub.2, 3-11 mol % of Al.sub.2 O.sub.3, 16-26 mol % of B.sub.2 O.sub.3, and 3-11 mol % of at least one oxide of SrO, CaO, MgO and ZnO is useful in the preparation of ceramic substrates. Since the amount of orthoboric acid formed on the glass in contact with humid air is minimized, the glass gives rise to little trouble in the manufacture of ceramic substrates. Ceramic compositions using the glass and a filler can be fired at low temperatures into sintered substrates which are characterized by a low dielectric constant, low dielectric dissipation factor, and high flexural strength.

Abstract: A glass composition which is essentially free of lead and cadmium includes 30 to 70 wt % SiO.sub.2, 1 to 25 wt % B.sub.2 O.sub.3, 0 to 10 wt % Al.sub.2 O.sub.3, 0 to 5 wt % Bi.sub.2 O.sub.3, 0.1 to 30 wt % CoO, 0.1 to 20 wt % ZnO, 1 to 30 wt % total of at least one of Li.sub.2 O, Na.sub.2 O or K.sub.2 O, up to 10 wt % ZrO.sub.2 and other optional ingredients. The glass composition can be used as a blue colored on-glaze enamel which relies upon the presence of Co.sup.2+ in a network-forming position in the glass to produce the blue color, with oxygen donors such as ZnO.sub.2, alkaline earth oxides and alkali oxides increasing the amount of cobalt occupying network-forming positions, and ZrO.sub.2 to provide chemical durability.

Abstract: In order to provide a glass which can be sealed to tungsten and Kovar and has a solarization resistance against the ultraviolet ray, and which is adaptable for use in a fluorescent lamp of a reduced size used as a light source for a lighting device in a liquid crystal display (13). The glass for use in a fluorescent lamp which consists essentially, by weight, of SiO.sub.2 55-79%, B.sub.2 O.sub.3 12.5-25%, Al.sub.2 O.sub.3, 0.5-10% Li.sub.2 O+Na.sub.2 O+K.sub.2 O 1-16%, ZrO.sub.2 0.01-5%, TiO.sub.2 +PbO+Sb.sub.2 O.sub.3 0.05-11%.

Abstract: The invention relates to a borosilicate glass of high chemical resistance and low viscosity which contains zirconium oxide and lithium oxide. The borosilicate glass has hydrolytic resistance (in accordance with DIN ISO 719), class 1 acid resistance (in accordance with DIN 12116), and class 1 alkali resistance (in accordance with DIN ISO 659), and with a low operating temperature V.sub.A of between 1180.degree. C. to 1230.degree. C. and a coefficient of thermal expansion .alpha..sub.20/300 of 4.9.times.10.sup.-6 K.sup.-1. The borosilicate glass has the composition (in % by weight, based on oxide): SiO.sub.2 73-75; B.sub.2 0.sub.3 7-10; Al.sub.2 0.sub.3 5-7; ZrO.sub.2 1-3; Li.sub.2 0 0.5-1.5; Na.sub.2 0 0-10; K.sub.2 0 0-10; MgO 0-3; CaO 0-3; BaO 0-3; SrO 0-3; ZnO 0-3; ratio of SiO.sub.2 /B.sub.2 0.sub.3 .gtoreq.7.5; .SIGMA. SiO.sub.2 +Al.sub.2 0.sub.3 +ZrO.sub.2 80-83 and .SIGMA. MgO+CaO+BaO+SrO+ZnO.ltoreq.3, and fluorides 0-3.

Abstract: This invention is directed to the production of cuprous halide- or a cuprous-cadmium halide-containing glass articles which are essentially completely opaque to ultraviolet radiation and can be essentially completely opaque to radiation within the region of wavelengths of up to 550 nm, but are transparent to visible radiations having a wavelength longer than the radiation within the region of opacity. The method involves exposing the glass articles to a hydrogen gas-containing atmosphere at a temperature between about 375.degree.-500.degree. C. for a period of at least 18 hours to develop an integral reduced layer in at least one surface of the article having a depth effective to prevent the transmission of ultraviolet radiation and radiation having a wavelength up to 550 nm through the article.

Abstract: A low-fusing temperature porcelain compositions, methods of use thereof on metal or porcelain substrates to form dental prostheses and kits therefor. Compositions of the invention have a fusing temperature of less than 800.degree. C. and a coefficient of thermal expansion compatible with a substrate of metal or ceramic. Each composition includes, in weight percent of the composition, from 40 to 65 percent by weight SiO.sub.2, from 6 to 12 percent by weight Al.sub.2 O.sub.3, from 6 to 12 percent by weight Na.sub.2 O, from 5.5 to 10.50 percent by weight K.sub.2 O, from 1 to 3 percent by weight Li.sub.2 O, from 0.8 to 2.5 percent by weight CaO, from 0.8 to 4.0 percent by weight B.sub.2 O.sub.3 and from 0.1 to 0.8 percent by weight CeO.sub.2.

Abstract: Transparent glass obtained from a mixture of oxides, wherein the mixture of oxides has the following composition, expressed as a percentage of the total weight:______________________________________ SiO.sub.2 59 to 78 B.sub.2 O.sub.3 2 to 8 Na.sub.2 O 3 to 8 K.sub.2 O 0.2 to 1.5 Li.sub.2 O 0.5 to 2.5 CaO 3 to 12 MgO 1 to 8 ZnO 0.2 to 3 Al.sub.2 O.sub.3 1.5 to 4 TiO.sub.2 0.1 to 0.8 ZrO.sub.2 0.7 to 2.5 Fe.sub.2 O.sub.3 0.01 to 0.3 SO.sub.3 0.01 to 0.3 CeO.sub.2 0.1 to 0.2 ______________________________________This glass is particularly strong.

Abstract: The invention pertains to a new lead-free glass composition with improved properties, a glass frit of this composition and its use for the production of glass-enamel, particularly for architectural glass.The glass composition contains in mole %:______________________________________ Na.sub.2 O 10-15 K.sub.2 O 0.1-2 SiO.sub.2 40-50 B.sub.2 O.sub.3 8-12 TiO.sub.2 4-7 Al.sub.2 O.sub.3 0.1-3 ZnO 13-17 F 1-5 ______________________________________and less than 0.5 weight % each of the oxides of the series PbO, CdO, P.sub.2 O.sub.5, and alkaline earth metal oxides. Use of a dye preparation containing the glass frit at 600.degree. to 650.degree. C. results in bakeable glazed, crack-free, acid and base resistant enamel layers.

Abstract: A leucite-containing phosphosilicate glass-ceramic is described which, in addition to a leucite crystalline phase and at least one further crystalline phase, also contains one or more glass phases.

Abstract: A powder composition for the preparation of an opaque dental porcelain, containing as its componentsone or more feldspar frits consisting of a number of feldspar frits of different chemical compositions and different physical properties;CeO.sub.2 as the opacifier, optionally additional opacifiers; andoptionally pigments.

Abstract: A glass-ceramic sintered body comprising an SiO.sub.2 --Al.sub.2 O.sub.3 --MgO--ZnO--B.sub.2 O.sub.3 type crystalline glass and alumina, said sintered body containing at least 10% by weight of a spinel crystalline phase; and a substrate composed of the sintered material. There is also provided a process for producing the glass-ceramic sintered body which comprises adding a binder to a mixed powder of an SiO.sub.2 --Al.sub.2 O.sub.3 --MgO--ZnO--B.sub.2 O.sub.3 type crystalline glass and alumina, molding the mixture into a predetermined shape, and firing the mixture into a predetermined shape, and firing the molded mixture at a temperature of 925.degree. to 1000.degree. C. in a non-oxidizable atmosphere. The glass-ceramic sintered body and the substrate composed of it in accordance with the present invention have excellent mechanical strength and thereby have markedly increased metallizing adhesion strength.

Abstract: Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .psi. of between 0.3 and 0.5N/(mm.sup.2 .times.K) , a glass transitione temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .psi. multiplied by (Tg -20.degree. C.) of between 180 and 360N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dPas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 10.sup.7.6 dPas) of over 830.degree. C.

Abstract: The present invention relates to a manufacturing method of a far infrared ray emitting material having a wavelength of predetermined frequency band and a far infrared ray emitting product using the same, the manufacturing method including steps of: having a mixing vessel containing a predetermined quantity of materials agitated for 0.5-1 hour by a stirrer having a rotative speed of 33 revolution per minute and mixied; and the materials being thrown into a glass dissolving furnace of 1,350-1,550 degrees celsius and fused for 19-21 hours, whereby the predetermined quantity of materials is constituted by silicon oxide of 45-65 weight %, felspar oxide of 7-9 weight %, borax of 10-20 weight %, boric acid of 4-6 weight %, potassium carbonate of 2-4 weight %, nite of 1.0-1.2 weight %, aluminum hydroxide of 3.3-6.8 weight %, limestone of 1.4-1.8 weight %, barium carbonate of 0.8-1.0 weight %, lithium of 0.7-0.8 weight %, zircon of 1.0-1.3 weight %, phosphoric acid of 0.2-0.4 weight %, carbon of 3.0-3.

Abstract: Disclosed is a barium-free glass of good x-ray absorption, which has a composition (in wt.-% on the oxide basis) of SiO.sub.2 50-75; ZrO.sub.2 5-30; Li.sub.2 O 0-5; Na.sub.2 O 0-25; K.sub.2 O 0-25; .SIGMA. alkali oxides 0-25. Preferred is a dental glass of the composition of SiO.sub.2 55-70; ZrO.sub.2 10-25; Li.sub.2 O 0-15; Na.sub.2 O 10-25; K.sub.2 O 0-15; .SIGMA. alkaloids 15-25. The glass can furthermore contain also up to 3 wt.-% of fluorine, up to 5 wt.-% of MgO, up to 5 wt.-% of TiO.sub.2, and in each case up to 10 wt.-% of the oxides Al.sub.2 O.sub.3, GeO.sub.2, P.sub.2 O.sub.5, La.sub.2 O.sub.3, Y.sub.2 O.sub.3, Ta.sub.2 O.sub.3, Gd.sub.2 O.sub.3, ZnO and Nb.sub.2 O.sub.5. The glass finds its use in powder form with an average particle size of .ltoreq.10 .mu.m as filler for dental composites for filling teeth.

Abstract: An article of manufacture comprising a glass substrate having a thermal expansion of less than 5.0.multidot.10.sup.-6 /K and, coated thereon, a lead- and cadmium-free glaze comprising, in percent by weight, the following components:______________________________________ Li.sub.2 O 0-12 MgO 0-10 CaO 3-18 B.sub.2 O.sub.3 5-25 Al.sub.2 O.sub.3 3-18 Na.sub.2 O 3-18 K.sub.2 O 3-18 BaO 0-12 SiO.sub.2 25-55 TiO.sub.2 0-5 ZrO.sub.2 0-<3 ______________________________________with up to 30% by weight of a pigment stable at the baking temperature.

Abstract: Irregularly shaped glass fibers and insulation therefrom comprise two different glasses having differing coefficients of thermal expansion. The irregularly shaped dual-glass fibers are made from wool glass compositions with the addition of at least one of BaO, SrO, K.sub.2 O, Li.sub.2 O, ZnO, TiO.sub.2 and Fe.sub.2 O.sub.3.

Abstract: An on-glaze low expansion glass flux composition suitable for coating onto a glazed surface which is essentially free from lead and cadmium and comprises, in mole percent, SiO.sub.2 : 35 to 75%, Bi.sub.2 O.sub.3 : 4 to 12%, Al.sub.2 O.sub.3 : 2 to 12%, B.sub.2 O.sub.3 : 18 to 35%, at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O : 0 to 12% (in total), and certain other optional ingredients with the provisos that BaO is not contained in an amount of more than 2 mole percent, the total amount of Bi.sub.2 O.sub.3 +B.sub.2 O.sub.3 +Li.sub.2 O,Na.sub.2 O and K.sub.2 O is in the range of from 25 to 45 mole percent, the total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O is in the range of up to 10 percent by weight except when the only alkali metal oxide present is Li.sub.2 O, and the composition has a coefficient of thermal expansion in the range of from 4.0 to 7.0.times.10.sup.-6 /.degree.C.

Abstract: Borosilicate glass weak in boric acid having a high chemical stability with an alkali resistance according to DIN 52 322 of LBK-Class 1, a thermal expansion .alpha..sub.20/300 between 4.0 to 5.3.times.10.sup.-6 K.sup.-1, a ratio .alpha.'/.alpha. of thermal expansion coefficients above T.sub.g (.alpha.') to below T.sub.g (.alpha.) of 4 to 8, a glass transformation temperature between 500.degree. C. and 600.degree. C., high radiation transmittance and a UV transmission .tau..sub.250 nm/1 mm of 0 to 70% or .tau..sub.300 nm/1 mm of 0 to 91% of the composition in percent by weight on oxide basis of: SiO.sub.2 >75; B.sub.2 O.sub.3 1 to <9; Al.sub.2 O.sub.3 3 to 6; Li.sub.2 O 0 to 4; Na.sub.2 O 0 to 8; K.sub.2 O 0 to 6; MgO 0 to 3; CaO 0 to 3; BaO 0 to 2; SrO 0 to 2; ZnO 0 to 3; ZrO.sub.2 0 to 3; SnO.sub.2 0 to 3; SnO 0 to 3; TiO.sub.2 0 to 2; CeO.sub.2 0 to 2; Fe.sub.2 O.sub.3 0 to 1; with SiO.sub.2 +B.sub.2 O.sub.3 >83; SiO.sub.2 :B.sub.2 O.sub.3 >8; SiO.sub.2 +Al.sub.2 O.sub.3 +ZrO.sub.2 >83; Li.

Abstract: Glass bubbles for use as fillers in a plastic resin substrate of an electrical printed circuit board are light in weight, low in density, and small in alkali amount leached sufficiently to insure electrical insulation resistance of the substrate, and consist essentially of, by weight, SiO.sub.2 40.0-60.0%, Al.sub.2 O.sub.3 5.0-22.0%, B.sub.2 O.sub.3 1.0-15.0%, CaO 10.0-30.0%, BaO 0-15.0%, MgO 0-10.0%, ZnO 0-10.0%, SrO 0-10.0%, Na.sub.2 O+K.sub.2 O+Li.sub.2 O 0-1.9%, As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 0-1.54, V.sub.2 O.sub.5 0-10.0%, TiO.sub.2 0-10.0%, and SO.sub.3 0.05-1.7%.

Abstract: Glass-ceramic for information recording disks have a crystalline structure suitably used for substrate materials and the like for magnetic disks and magneto-optic disks as well as have improved surface characteristics obtained by polishing the glass, and besides the base glass thereof is excellent in melting properties and moldability thereof. The base glass composition consists essentially of ingredients of SiO.sub.2 -Al.sub.2 O.sub.3 -ZnO-MgO-CaO-SrO-BaO-TiO.sub.2 system. The main crystalline phase of the glass-ceramic produced by heat-treating the base glass having a viscosity of log .eta.=3.0 poise or less at 1250.degree. C. is gahnite, a size of the crystal grain is within a range of from 50 to 1000 Angstrom, and a degree of surface roughness (Ra) of the polished glass-ceramic is within a range of from 0.5 to 9.0 Angstrom.

Abstract: A non-photochromic colored glass containing crystals of precipitated cuprous oxide in a matrix of glass, the matrix glass consisting essentially of, in cation percent, 35-75% SiO.sub.2, 15-45% B.sub.2 O.sub.3, 0-12% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being less than 10% when the SiO.sub.2 is over 55%, 0-5% ZrO.sub.2, 0-12% Li.sub.2 O, 0-20% Na.sub.2 O, 0-12% K.sub.2 O, the sum Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 5-20%, 0-5% CaO+BaO+SrO, 0.4-1.75% Cu.sub.2 O, 0-2% As.sub.2 O.sub.3, 0-2% Sb.sub.2 O.sub.3, 0-1% SnO.sub.2, the sum As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +SnO.sub.2 being 0.5-2%, characterized by 0.075.ltoreq.R-value .ltoreq.0.

Abstract: This invention is directed to the production of glasses useful for ophthalmic applications which exhibit excellent resistance to the development of coloration upon being exposed to x-radiation and excellent resistance to the development of solarization. The glass compositions are essentially free of lead and consist essentially, in weight percent, of______________________________________ SiO.sub.2 60-70 ZrO.sub.2 0.5-2 TiO.sub.2 0-1.5 B.sub.2 O.sub.3 0.5-5 CeO.sub.2 0.1-0.3 Sb.sub.2 O.sub.3 0-0.5 Al.sub.2 O.sub.3 2-6 Li.sub.2 O 0-2 SO.sub.3 0-0.3 Na.sub.2 O 9-14 MgO 0-5 Br 0-0.5 K.sub.2 O 3-10 SrO 0-5 Cl 0-0.5 CaO 0.5-4 BaO 0-5 F 0-0.5.

Abstract: A surface-reduced photochromic glass containing silver halide crystals, having an original transmittance of 60-75%, a darkened transmittance of less than 30% at 25.degree. C., a faded transmittance equal to the darkened transmittance plus at least 25% and a value of at least 50%, a position in a color mixture diagram between 575 and 585 nm, the glass composition having a Na.sub.2 O content of at least 1% in its surface, or containing as additives 1-6 ppm Pd, or a combination of 2-10 ppm Au and up to 0.9% Er.sub.2 O.sub.3. The glass may be chemically strengthened and generally has a longer dominant wavelength when so treated.

Abstract: An optical glass including as its main ingredients in weight percent 25-50% SiO.sub.2, 16-40% B.sub.2 O.sub.3, 5-25% SrO and 1-10% Li.sub.2 O has optical constants of refractive index (Nd) of 1.55-1.65 and Abbe number (.nu.d) of 55-63 and a yield point (At) below 600.degree. C. which is suited for mold pressing.

Abstract: A magnetic recording medium comprising a magnetic recording layer and at least one protective layer formed on the recording layer, wherein the outermost protective layer on the side exposed to air is made of an oxide film.

Abstract: A highly chemically resistant borosilicate glass which is capable of forming a seal with tungsten and has a glass transition temperature T.sub.g >570.degree. C., a coefficient of thermal expansion of between 3.95 and 4.5.times.10.sup.-6 K.sup.-1, a hydrolytic resistance in accordance with DIN 12111 in class one and a TK.sub.100 value in accordance with DIN 52326 of at least 240.degree. C. is described which has the composition (in % by weight, based on oxide) of SiO.sub.2 70 to 78, B.sub.2 O.sub.3 9 to 12, Al.sub.2 O.sub.3 1.5 to 4, Li.sub.2 O 0 to 4, Na.sub.2 O 1 to 5, K.sub.2 O 1 to 5, total of alkali metal oxides 5 to 7, MgO 0 to 3, CaO 1 to 3, BaO 0 to 2, ZnO 0 to 2, ZrO.sub.2 0.5 to 3, total of MgO+CaO+BaO+ZnO+ZrO.sub.2 6 to 10, and optionally conventional refining agents. It is preferred that the K.sub.2 O:Na.sub.2 O ratio be greater than 1 and that alkaline earth metal oxides, except for CaO, be omitted.

Abstract: The invention concerns a lead-free glaze or enamel for use on ceramic bodies such as bone china. In one embodiment the glaze or enamel includes a hard glass frit which comprises by weight percent from about 45% to about 70% SiO.sub.2, from about 4% to about 15% B.sub.2 O.sub.3, from about 4% to about 17% Al.sub.2 O.sub.3, from about 1% to about 9% Na.sub.2 O, from about 1% to about 9% K.sub.2 O, from about 0.2% to about 5% Li.sub.2 O, from about 0.4% to about 12% CaO, from about 0.1% to about 7% ZrO.sub.2, up to about 3% ZnO, up to about 2% WO.sub.3, up to about 2% Bi.sub.2 O.sub.3, and up to about 2% MoO.sub.3.

Abstract: A brown chemstrengthenable contrast enhancement, UV attenuated glass (e.g., for sunglasses) comprises, in weight percent,______________________________________ Oxide Wt. % ______________________________________ SiO.sub.2 40-72 B.sub.2 O.sub.3 0-13 Al.sub.2 O.sub.3 0.5-3 Li.sub.2 O 0-3 Na.sub.2 O 8-15 K.sub.2 O 1-10 TiO.sub.2 4.2-10.2 CeO.sub.2 0.5-3.5 Nd.sub.2 O.sub.3 5.0-16.5 Fe.sub.2 O.sub.3 2.5-4.0 CoO 0.00-0.02 NiO 0.06-0.33 ZnO 0.0-7.0 Er.sub.2 O.sub.3 0-2 Cr.sub.2 O.sub.3 0.0-0.2 V.sub.2 O.sub.5 0.0-0.2 CuO 0.00-0.10 MnO.sub.2 0.0-2.0 having the following properties: % T.sub.v,c (1.8 mm) 14-30 a -0.1 to +6.0 b +18.0 to +26.0 % T (380 nm; 1.8 mm) 0.0 % T (400 nm; 1.8 mm) .ltoreq.1.5 ______________________________________meeting the D.sub.6500 (1.8 mm) and Traffic Signal (1.8 mm) specifications of ANSI Z80.3-1986, and wherein the amount of Fe.sup.+2 in the glass is selected sufficiently low that said "a" and Traffic Signal properties are achieved.

Abstract: A transparent, fixed tint glass lens is provided having a thickness of between about 1.0 mm and about 1.8 mm and which is derived from an alkali silicate composition containing, in terms of weight percent on an oxide basis, at least 6.2% iron oxides, at least 0.03% cobalt oxide and at least 0.12% nickel oxide in the presence of an oxidizing agent such as arsenic oxide. Preferably, the lenses have a transmittance of not more than 1% of ultraviolet radiation at 380 nm.

Abstract: This invention is directed to photochromic glasses which darken to a brown coloration upon exposure to actinic radiation, which glasses have a refractive index of about 1.6, an Abbe number between 42-47, a density less than 2.82 g/cm.sup.3, and are preferably essentially free of TiO.sub.2. The glass compositions consist generally, in weight percent, of:______________________________________ SiO.sub.2 43-52 K.sub.2 O 2-9 Nb.sub.2 O.sub.5 6-16 B.sub.2 O.sub.3 12.5-18 MgO 0-5 Ag 0.100-0.175 Al.sub.2 O.sub.3 0-3 CaO 0-5 Cl 0.140-0.350 ZrO.sub.2 6-14 SrO 0-9 Br 0.093-0.195 Li.sub.2 O 1.5-3.5 BaO 0-9 CuO 0.008-0.030. Na.sub.

Abstract: This invention is directed to a transparent glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm and exhibits a green fixed tint bounded by apices A,C,D,E,A of the drawing, a purity between 18-32%, and a dominant wavelength between 554-564 nm, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 Na.sub.2 O + K.sub.2 O 15-21 B.sub.2 O.sub.3 3-8 CaO 0-4 Al.sub.2 O.sub.3 0.5-5 ZnO 0-9 Na.sub.2 O 6-12 CaO + ZnO 1-5 K.sub.2 O 6-12 Fe.sub.2 O.sub.3 4.8-7.

Abstract: A transparent glass which, at a thickness of 2 mm, transmits less than 1% of ultraviolet radiation having a wavelength of 380 nm and exhibits a brown fixed tint bounded by apices A, B, D, F, A of the drawing, a purity between 48-70%, and a dominant wavelength between 580-588 nm, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 CaO 0-5.5 B.sub.2 O.sub.3 3-8 ZnO 0-4 Na.sub.2 O 6-10 CaO + ZnO 2-5.5 K.sub.2 O 7-12 Fe.sub.2 O.sub.3 3-5 Na.sub.2 O + K.sub.2 O 15-20 Se 0.01-2 Al.sub.2 O.sub.3 0-4 NiO 0-0.12.

Abstract: Described is an inorganic fiber comprising silica dioxide, calcium oxide, and alkali oxide having a free energy of hydration greater than (more positive than) -5.00 kcal/mol, an enthalpy of formation less than (more than negative than) -210.0 kcal/mol, a dissolution rate in simulated extra cellular fluid greater than 750 (calculated as nanograms of fiber/per square centimeter of fiber surface area/per hour) having an average fiber diameter not greater than 4.5 micrometers. Also described is a method of manufacturing the fibers.

Abstract: The present invention provides a method of adherently depositing a thick film composition on an aluminum nitride substrate comprising the steps of providing an aluminum nitride substrate, providing a thick film composition, and applying the thick film composition on the aluminum nitride substrate. The thick film composition includes a glass frit binder, a conductive metallic material and a lithium-containing adhesion promoting compound.

Abstract: A transparent, fixed tint glass lens is provided having a thickness of between about 1.0 mm and about 1.8 mm and which is derived from an alkali silicate composition containing, in terms of weight percent on an oxide basis, at least 6.2% iron oxides, at least 0.03% cobalt oxide and at least 0.12% nickel oxide in the presence of an oxidizing agent such as arsenic oxide. Preferably, the lenses have a transmittance of not more than 1% of ultraviolet radiation at 380 nm.

Abstract: The invention provides a glass-ceramic composite with sufficient strength and other excellent properties suitable for IC packages or multilayer substrates. The glass-ceramic composite of the invention includes crystallized glass and at least either of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five. The crystallized glass includes cordierite as primary crystals and contains 40 to 52 percent by weight of silicon dioxide or SiO.sub.2, 27 to 37 percent by weight of aluminum oxide or Al.sub.2 O.sub.3, 11 to 13 percent by weight of magnesium oxide or MgO, 2 to 8 percent by weight of diboron trioxides or B.sub.2 O.sub.3, 2 to 8 percent by weight of calcium oxide or CaO, and 0.1 to 3 percent by weight of zirconium oxide or ZrO.sub.2.

Abstract: Lead-free ceramic frits for producing glazes with intrinsic opacity, and methods of coationg ceramic substrates with the ceramic frits, wherein the ceramic frits have the following composition:______________________________________ SiO.sub.2 48-60 wt. % B.sub.2 O.sub.3 3-8 wt. % Al.sub.2 O.sub.3 4-8 wt. % Na.sub.2 O 0.2-2.0 wt. % K.sub.2 O 4-8 wt. % MgO 0-2 wt. % CaO 7.5-13 wt. % BaO 0-5 wt. % ZnO 7-12 wt. % ZrO.sub.2 0.3-2.5 wt. % TiO.sub.2 3.5-5.5 wt. % P.sub.2 O.sub.5 0-3 wt. % and Na.sub.2 O + K.sub.2 O 4.5-8.5 wt. %.

Abstract: An alkali free glass consisting essentially of from 50 to 60 wt % of SiO.sub.2, from 8 to 16 wt % of Al.sub.2 O.sub.3, from 4 to 10 wt % of B.sub.2 O.sub.3, from 1.5 to 5 wt % of MgO, from 0 to 7 wt % of CaO, from 0 to 10 wt % of SrO, from 10 to 20 wt % of BaO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides.

Abstract: Zinc-containing, lead- and cadmium-free glass frits with a softening point of less than 510.degree. C. are disclosed. Obligatory components of the glass-frit composition are 31-50 mole % ZnO, 10-44 mole % SiO.sub.2, 11-35 mole % B.sub.2 O.sub.3 and 11-25 mole % Na.sub.2 O. The glass frits can be used as base frit for the production of decorative coating masses which can be stoved below 630.degree. C., preferably masses for the decorating of glass.

Abstract: A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO.sub.2 30-50%; Al.sub.2 O.sub.3 10-25%; ZnO 8-25%; B.sub.2 O.sub.3 5-20%; TiO.sub.2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.

Abstract: This invention is directed to the production of lead-free enamels containing finely-divided glass particles, finely-divided pigment particles, and an organic binder wherein the glass particles consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 35-50 Li.sub.2 O + Na.sub.2 O + K.sub.2 O <8 B.sub.2 O.sub.3 23-30 CaO 1-5 Al.sub.2 O.sub.3 10-22 CaO + MgO + ZnO + BaO + SrO <7 Li.sub.2 O 1-3 TiO.sub.2 0-2 Na.sub.2 O 0-3 ZrO.sub.2 0-5 K.sub.2 O 2-5 ______________________________________said glass having a softening temperature T.sub.L above 650.degree. C. and thermal expansion coefficient below 60.times.10.sup.-7 /.degree.C. Among other applications, said glass can be used for the decoration of low-expansion glass-ceramic cooking plates.

Abstract: This invention is directed to glass compositions particularly designed for use as substrates in flat panel display devices and, more expressly, for use as substrates in LCDs which employ polycrystalline silicon thin film transistors. The glass compositions are essentially free from alkali metal oxides and consist essentially, in mole percent, of______________________________________ SiO.sub.2 65-76 MgO 0-5 ZrO.sub.2 0-2.5 Al.sub.2 O.sub.3 7-11 CaO 0-10 TiO.sub.2 0-3 BaO 12-19 SrO 0-10 Ta.sub.2 O.sub.5 0-3 B.sub.2 O.sub.3 0-5 MgO + 0-15 ZrO.sub.2 + 0.5-5. CaO + TiO.sub.2 + SrO Ta.sub.2 O.sub.