Abstract: The invention relates to an alkali-free aluminoborosilicate glass having a coefficient of thermal expansion &agr;20/300 of between 2.8.10−6/K and 3.6.10−6/K, which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO2)>58-65, boric oxide (B2O3)>6-11.5, aluminum oxide (Al2O3)>20-25, magnesium oxide (MgO) 4-<6.5, calcium oxide (CaO)>4.5-8, strontium oxide (SrO) 0-<4, barium oxide (BaO) 0.5-<5, with strontium oxide (SrO)+barium oxide (BaO)>3, zinc oxide (ZnO) 0-<2, and which is highly suitable for use as a substrate glass both in display technology and in thin-film photovoltaics.

Abstract: The invention relates to an alkali-free aluminoborosilicate glass which has the following composition in % by weight, based on oxide: SiO2 60.5-69, B2O3 0.5-4.5, Al2O3 15-24, MgO 3-10, CaO 0-10, SrO 0.5-8, BaO 0.5-5.5, with MgO+CaO+SrO+BaO 8-19, SnO2 0.1-2, ZrO2 0-2, TiO2 0-2, CeO2 0-1, ZnO 0-<1, and which is highly suitable for use as substrate glass both in display technology and thin-film photovoltaics.

Abstract: An alkali-free aluminoborosilicate glass having a coefficient of thermal expansion &agr;20/300 of between 2.8×10−6/K and 3.8×10−6/K, which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO2)>58−65, boric oxide (B2O3)>6−11.5, magnesium oxide (MgO) 4−8, barium oxide (BaO) 0−<0.5, zinc oxide (ZnO) 0−2 and aluminum oxide (Al2O3)>14−25, calcium oxide (CaO) 0−8, strontium oxide (SrO) 2.6−<4, with barium oxide (BaO)+strontium oxide (SrO) >3, or aluminum oxide (Al2O3)>14−25, calcium oxide (CaO) 0−<2, strontium oxide (SrO)>0.5−<4, or aluminum oxide (Al2O3)>21−25, calcium oxide (CaO) 0−8, strontium oxide (SrO)>2.6−<8, with barium oxide (BaO)−strontium oxide (SrO)>3, and which is highly suitable for use as a substrate glass both in display technology and in thin-film photovoltaics.

Abstract: The invention relates to an alkali-free aluminoborosilicate glass which has the following composition (in % by weight, based on oxide): silicon dioxide (SiO2)>58-65, boric oxide (B2O3)>6-10.5, aluminum oxide (Al2O3)>14-25, magnesium oxide (MgO) 0-<3, calcium oxide (CaO) 0-9, strontium oxide (SrO) 0.1-1.5, and barium oxide (BaO)>5-8.5, with strontium oxide (SrO)+barium oxide (BaO)<8.6, and with magnesium oxide (MgO)+calcium oxide (CaO)+strontium oxide (SrO)+barium oxide (BaO) 8-18; zinc oxide (ZnO) 0<2, and which is highly suitable for use as a substrate glass both in display technology and in thin-film photovoltaics.

Abstract: The lead-free optical light flint glass material has a refractive index nd between 1.54 and 1.61 and an Abbe number &ngr;d of between 38 and 45. It has a composition, based on oxide content, of SiO2 from 52 to 62% by weight, Al2O3 from 3 to 8% by weight, Na2O from 7 to 14% by weight, K2O from 8 to 14% by weight, TiO2 from 13 to 18% by weight, ZrO2 from 0 to 5% by weight, with at least one refining agent, if needed, in an amount suitable for the purposes of refining; and with the proviso that a sum total of Na2O and K2O present is greater than 18% by weight.

Abstract: Magnetic disks comprising a substrate and glass materials which are used in the manufacture of hard disc substrates. The glasses can have the following compositions (in per cent by weight on an oxide basis): SiO2 10-30, Al2O3 0-5, B2O3 0-8, Li2O 0-8, Na2O 1-10, with Li2O+Na2O 5-10, K2O 0-3, MgO 5-16, CaO 0-15, with MgO+CaO>15-25, SrO+BaO 0-8, ZrO2 0-8, TiO2 7-25, La2O3 0-10, Nb2O5 5-20, V2O5 0-10, CeO2 0-1, As2O3+Sb2O3+F 0.1-1. These glasses can have high dimensional stability as a result of their high specific modulus of elasticity, to be especially suited for hard disk substrates.

Abstract: The zirconium-containing and lithium-containing borosilicate glasses have a higher resistance to chemical attack and have the following composition (in % by weight on an oxide basis): SiO2, 71 to <73%; B2O3, 7 to 10%; Al2O3, 6 to 9%; Li2O, 0.5 to 2%; Na2O, 0 to 10%; K2O, 0 to 10%; MgO, 0 to 2%; CaO, 0 to 3%; SrO, 0 to 3%; BaO, 0 to 3%; ZnO, 0 to 3%; ZrO2, 0.8 to 3%; CeO2, 0 to 1%, and a refining agent in an amount suitable for refining, as needed, with the proviso that a total amount of Li2O+Na2O+K2O is from 0.5 to 10.5%, and with the proviso that a total amount of MgO+CaO+SrO+BaO+ZnO is from 0 to 3%. These borosilicate glasses with their thermal expansion coefficients &agr;20/300 between 5.2 and 5.7×10−6/K are especially suitable for sealing glasses for Fe—Co—Ni alloys.

Abstract: High E-moduli glasses and glass-ceramics are disclosed based on the SiO2—B2O3—RO—R2O—ZrO2—TiO2—Nb2O5—La2O3 system. The chemically pre-stressable glasses are lithium-poor or lithium-free. The glass-ceramics contain from 2 to 9 percent by weight lithium and the predominant crystalline phase is lithium titanate. These glasses and glass-ceramics particularly have a high specific E-modulus.

Abstract: An alkali metal-free aluminoborosilicate glass is described which has the following composition (in % by weight based on oxide):SiO.sub.2 57-60; B.sub.2 O.sub.3 6.5-9.5; Al.sub.2 O.sub.3 14-17.5; MgO 5-8; CaO 1-4; SrO 5-8; BaO 0-3.5; with MgO+CaO+SrO+BaO 15-17; ZrO.sub.2 0.4-1.5; TiO.sub.2 0.4-1.5; CeO.sub.2 0.1-0.5; SnO.sub.2 0.2-1.The glass is particularly suitable for use as a substrate glass in display technology.

Abstract: The invention relates to a solarization-stable aluminosilicate glass which has the following composition (in % by weight, based on oxide): SiO.sub.2 45-68; Al.sub.2 O.sub.3 >5-18; Na.sub.2 O 0-5; K.sub.2 O>9-15; where Na.sub.2 O+K.sub.2 O.gtoreq.10; CaO 0-10; SrO 0.5-18; BaO 0-10; where CaO+SrO+BaO 8-<17; ZrO.sub.2 1-6; TiO.sub.2 0.2-5. The glass is particularly suitable as substrate glass in display technology, in particular for plasma display panels.

Abstract: Described is an alkali-free aluminoborosilicate glass with a viscosity of 10.sup.13 dPas at a temperature of above 700.degree.0 C., a processing temperature V.sub.A of less than 1220.degree.0 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 48 -- <55 B.sub.2 O.sub.3 7 -- 15 Al.sub.2 O.sub.3 >20 -- 26 MgO 0 -- 8 CaO 4 -- 12 BaO 0 -- 2 SrO 0 -- 2 ZnO 1 -- 8 ZrO.sub.2 0 -- 2 SnO.sub.2 0.5 -- 2 ______________________________________The glass is especially suitable for use in display technology.

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: 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: 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: Reducing melt borosilicate glass having a UV transmittance of at least 85% for ultraviolet radiation having a wavelength of 254 nm for a sample thickness of 1 mm and a water-resistance of less than 100 micrograms, advantageously less than 62 micrograms, Na.sub.2 O per gram of glass powder according to ISO 719 and a thermal expansion coefficient .alpha..sub.20/300 of from 5 to 6.times.10.sup.-6 K.sup.-1 and comprising from 58 to 65% by weight SiO.sub.2, from 18 to 20.5% by weight B.sub.2 O.sub.3, from 8.1 to 10.4% by weight Al.sub.2O.sub.3, from 0 to 1% by weight CaO, from 0 to 2% by weight BaO, from 0 to 2% by weight SrO, from 0 to 1.5% by weight Li.sub.2 O, from 5.5 to 8.5% by weight Na.sub.2 O, from 0 to 3% by weight K.sub.2 O and from 0 to 2% by weight fluorine. The sum total content of all of the alkali metal oxides present in the glass is not greater than 10% and the sum total content of the CaO, BaO and SrO is not greater than 3% and the molar ratio of Al.sub.2 O.sub.3 : Na.sub.2 O is from 0.6 to 1.

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: Lead- and barium-free crystal glass for the production of high-quality glasses and domestic articles, having high optical transmission, a refractive index n.sub.D of greater than 1.52, a density of at least 2.45 g/cm.sup.3, high hydrolytic resistance, good solarization resistance, and a K.sub.2 O+ZnO content of greater than 10% by weight, the glass system being based on an alkali-lime-silicate glass containing TiO.sub.2, ZrO.sub.2, Nb.sub.2 O.sub.3 and possibly Ta.sub.2 O.sub.5 and/or combinations thereof.

Abstract: A drilling or chiseling tool (1) includes a suction device (2) with a suction head (3), a suction line (4) extending from the suction head to a suction blower wheel (5) and a separating device (6). The suction device (2) is detachably connected with the tool (1). When connecting the suction device (2) to the tool (1), the shaft (9) of the suction blower wheel (5) can be coupled with the drive shaft (8) of a drive motor (7) for the tool.

Abstract: A borosilicate glass is described of the composition on oxide basis in % by weight of 50-75 SiO.sub.2, 11-18 B.sub.2 O.sub.3, 1-5 Al.sub.2 O.sub.3, 0-3 Li.sub.2 O, 0-3 Na.sub.2 O, 0-2 K.sub.2 O, 9-22 Cs.sub.2 O, 0-2 ZnO, 0-2 MgO, 0-3 CaO, 0-3 SrO, 0-3 BaO, provided that the sum of the alkali oxides, apart from Cs.sub.2 O, is at most 5 and the sum of the alkaline-earth oxides plus ZnO is at most 6. The glass is especially suitable for the production of electronic flash lamps, which with this glass reach a multiple of the service life of electronic flash lamps made from the conventional glass.