Abstract: This invention is directed to the production of glass microsheet which strongly resists solarization and exhibits an ultraviolet cutoff at 370 nm, the glass consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ Na.sub.2 O 6.75-7.75 B.sub.2 O.sub.3 8.75-10 K.sub.2 O 6.25-7.0 SiO.sub.2 59-63 ZnO 6.5-7.5 CeO.sub.2 4-6 Al.sub.2 O.sub.3 2-2.5 TiO.sub.2 1-3 Sb.sub.2 O.sub.3 0-0.5 CeO.sub.2 + TiO.sub.

Abstract: This invention relates to glass compositions especially designed for use as envelopes for tungsten-halogen incandescent lamps wherein molybdenum metal lead wires are utilized. The glasses consist essentially, expressed in terms of weight percent on the oxide basis, of 8.5-14% BaO, 10.5-12.5% CaO, 14-15.5% Al.sub.2 O.sub.3, and 59.5-63% SiO.sub.2.

Abstract: This invention is concerned with a narrowly-defined composition area of glasses in the alkaline earth aluminosilicate system especially suitable for fabricating tungsten-halogen lamp envelopes. The invention comprises the use of arsenic in the batch in such amounts as to yield about 0.17-0.3% by weight as analyzed in the glass as a secondary fining agent to insure a seed count no greater than 10/in.sup.3. The base glass compositions consist essentially, in weight percent, of about:______________________________________ SiO.sub.2 64-68 BaO 0-5 CaO 11-14 SrO 0-4 Al.sub.2 O.sub.3 16.5-18.5 BaO + SrO 2-6.

Abstract: The present invention is concerned with the preparation of glazes which are especially suitable for application to glass-ceramic articles containing potassium fluorrichterite as substantially the sole crystal phase. The glazes consist essentially, expressed in terms of weight percent on the oxide basis, ofSiO.sub.2 :46-50Al.sub.2 O.sub.3 :5-8ZrO.sub.2 :0.3-1Li.sub.2 O:1-2Na.sub.2 O:2-3.5K.sub.2 O:1-2CaO:1-4ZnO:2-6SrO:2-6B.sub.2 O.sub.3 :9-11PbO:20-25.

Abstract: This invention is directed to the preparation of transparent glasses displaying a light gray-brown tint that consist essentially, in weight percent on the oxide basis, ofSiO.sub.2 --80-82B.sub.2 O.sub.3 --11.25-12Na.sub.2 O--5.25-6Al.sub.2 O.sub.3 --1.9-2.1MnO.sub.2 --0.05-0.5NiO--0.01-0.07Cr.sub.2 O.sub.3 --0.005-0.

Abstract: The instant invention is concerned with the production of spontaneous opal glasses exhibiting tints ranging from ivory-through-beige-through-tan-to-brown, depending upon the shade sought, and demonstrating a Fe.sup.+3 reading between about 6.5-9 consisting essentially, expressed in weight percent on the oxide basis, of about______________________________________ SiO.sub.2 64.5 .+-. 2.0 Al.sub.2 O.sub.3 6.25 .+-. 0.5 Na.sub.2 O 3.0 .+-. 0.5 K.sub.2 O 3.0 .+-. 0.5 MgO 1.25 .+-. 0.3 B.sub.2 O.sub.3 4.5 .+-. 0.7 F 3.25 .+-. 0.5 CaO 14.5 .+-. 1.0 NiO 0.02 - 1.

Abstract: The present invention is concerned with the production of spontaneous opal glasses which, after thermal tempering, demonstrate a dense coloration ranging from ivory through yellow-beige to tan to a grayish-brown appearance, consisting essentially, by weight on the oxide basis, of 8-9% Na.sub.2 O, 2-2.5% K.sub.2 O, 5-6.5% CaO, 8-10% ZnO, 1-2% B.sub.2 O.sub.3, 10-11% Al.sub.2 O.sub.3, 3-4% F, 0.005-0.1% NiO, 0-2% CeO.sub.2, 0-4%TiO.sub.2, 0.5-6% CeO.sub.2 +TiO.sub.2, 0-0.5% As.sub.2 O.sub.3, and 57-61% SiO.sub.2.

Abstract: The instant invention is concerned with glass envelopes for tungsten-halogen lamps. The glasses exhibit a strain point higher than 750.degree. C., a coefficient of thermal expansion (0.degree.-300.degree. C.) between 42-44.times.10.sup.-7 /.degree.C., a liquidus temperature below 1300.degree. C., a viscosity at the liquidus of at least 40,000 poises, and consist essentially, in weight percent on the oxide basis, of 64-68% SiO.sub.2, 11-14% CaO, 16.5-18.5% Al.sub.2 O.sub.3, and 2-6.5% SrO+BaO consisting of 0-4% SrO and 0-5% BaO. The preferred glasses demonstrate a viscosity of less than 1000 poises at temperatures no higher than 1520.degree. C. and contain at least 3% total of SrO+BaO, those components being present in a molar ratio SrO:BaO ranging from 2:1-1:2.

Abstract: This invention is directed to the production of glasses having particular utility as envelopes for tungsten-halogen incandescent lamps because of their thermal endurance and capability of use at the high temperatures at which such lamps operate, coupled with their facility for being sealed to molybdenum. The glasses manifest a strain point in excess of 730.degree. C., a liquidus temperature less than 1200.degree. C., a viscosity at the liquidus of at least 40,000 poises, axial compression at room temperature not exceeding 350 PPM and axial tension or compression at 500.degree. C. not exceeding 150 PPM when sealed to molybdenum leads, and a coefficient of thermal expansion (0.degree.-300.degree. C.) less than 48.times.10.sup.-7 /.degree. C. Such glasses consist essentially, by weight on the oxide basis, of 61-65% SiO.sub.2, 14-17% Al.sub.2 O.sub.3, 8-15% CaO, and 6-9% SrO.

Abstract: This invention is drawn to the production of transparent glasses which display exceptional resistance to attack by detergents such as are utilized in commercial dishwashers, thereby rendering such glasses eminently suitable for food service ware and, in particular, drinkware articles. The glasses strongly resist the development of iridescence, an undesirable phenomenon frequently occurring in transparent glasses used for food service after exposure to dishwasher detergents. Operable compositions consist essentially, expressed in weight percent on the oxide basis as calculated from the batch, of:______________________________________ Na.sub.2 O 8-12% K.sub.2 O 0-5 Na.sub.2 O + K.sub.2 O 8-12 Al.sub.2 O.sub.3 7-10 B.sub.2 O.sub.3 >1 but <5 CaO 0-10 MgO 0-5 SrO 0-10 BaO 0-10 ZnO 0-5 CaO + MgO + SrO + BaO + ZnO 7.5-13 SiO.sub.

Abstract: This invention is drawn to the production of thermally-tempered, transparent glass articles which are integrally colored to demonstrate a particular amber-with-rose-highlights hue. More definitively, the present invention is directed to narrowly-delineated glass compositions within the general Na.sub.2 O-CaO-SiO.sub.2 system having incorporated therein critically-limited amounts of NiO and MnO.sub.2 as colorants.