Abstract: Ultraviolet and infrared radiation absorbing glass comprising, as basic glass components, 65 to 80% by weight of SiO.sub.2, 0 to 5% by weight of Al.sub.2 O.sub.3, 0 to 10% by weight of MgO, 5 to 15% by weight of CaO, 10 to 18% by weight of Na.sub.2 O, 0 to 5% by weight of K.sub.2 O, 5 to 15% by weight in total of MgO and CaO, 10 to 20% by weight in total of Na.sub.2 O and K.sub.2 O, and 0.2 to 5.0% by weight of B.sub.2 O.sub.3 ; and as coloring components, 0.5 to 1.0% by weight, in terms of Fe.sub.2 O.sub.3, of total iron oxide having a ratio of FeO based on the total iron oxide of 0.20 to 0.40, 0.2 to 2.0% by weight of CeO.sub.2, and 0 to 1.0% by weight of TiO.sub.2, and ultraviolet and infrared radiation absorbing glass comprising, as basic glass components, 65 to 80% by weight of SiO.sub.2, 0 to 5% by weight of Al.sub.2 O.sub.3, 0 to 10% by weight of MgO, 5 to 15% by weight of CaO, 10 to 18% by weight of Na.sub.2 O, 0 to 5% by weight of K.sub.

Abstract: Ultraviolet and infrared radiation absorbing glass comprising, as basic glass components, 65 to 80% by weight of SiO.sub.2, 0 to 5% by weight of Al.sub.2 O.sub.3, 0 to 10% by weight of MgO, 5 to 15% by weight of CaO, 10 to 18% by weight of Na.sub.2 O, 0 to 5% by weight of K.sub.2 O, 5 to 15% by weight in total of MgO and CaO, 10 to 20% by weight in total of Na.sub.2 O and K.sub.2 O, and 0 to 5% by weight of B.sub.2 O.sub.3 ; and as coloring components, 0.75 to 0.95% by weight, in terms of Fe.sub.2 O.sub.3, of total iron oxide, 1.2 to 1.4% by weight of CeO.sub.2, and 0 to 0.5% by weight of TiO.sub.2, and satisfying equation (I):(0.2.times.(CeO.sub.2)-0.04).ltoreq.(FeO/T-Fe.sub.2 O.sub.3).ltoreq.(0.2.times.(CeO.sub.2)+0.08) (I)wherein (CeO.sub.2) represents the amount of CeO.sub.2 in terms of percent by weight, and (FeO/T-Fe.sub.2 O.sub.3) represents the weight ratio of FeO in terms of Fe.sub.2 O.sub.3 to the total iron oxide in terms of Fe.sub.2 O.sub.

Abstract: The present invention provides a porcelain enamel coating composition for use in forming a coating composition upon a metal substrate having an infrared reflectivity of at least 50% at 2.5 .mu.-microns measured with a Perkin Elmer Lambda 19 UV/VIS/NIR spectrometer with a labsphere RSA-PE 19 reflectance spectroscopy accessory. The coating composition comprises a glass component and a separate and distinct addition of cerium oxide. Preferably, the coating composition comprises from about 0.20% to about 3.0% by weight of the cerium oxide.

Abstract: Opal glass compositions for producing opal glass articles such as perfume bottles are disclosed. The compositions are borosilicate compositions and further include 0.5-3.0 wt % of CaO and 1.0-6.0 wt % of P.sub.2 O.sub.5, and the sum of alkaline oxides totals 9-18 wt %.

Abstract: The invention relates to a glass composition for electric lamps which glass composition comprises SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, B.sub.2 O.sub.3, BaO and SrO and optionally CaO, MgO, ZnO, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3, TiO.sub.2, MnO.sub.2, Fe.sub.2 O.sub.3 and/or CeO.sub.2. The composition according to the invention has a B.sub.2 O.sub.3 content of 1 to 2.8 mass %, a SrO content of 2.1 to 4.5 mass %, a BaO content of 3 to 6 mass % and of the components being present optionally, the amount of CaO is maximum 1 mass %, that of MgO is maximum 2.4 mass % and that of ZnO is maximum 3 mass %, on the condition that the total amount of SrO and B.sub.2 O.sub.3 is at least 3.6 mass %, the total amount of CaO and MgO is maximum 2.4 mass % and the total amount of MgO and ZnO is maximum 4.5 mass %.

Abstract: A glass material is provided which is capable of exhibiting fluorescence in the visible region by ultraviolet ray excitation. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %):______________________________________ SiO.sub.2 2 to 60%, B.sub.2 O.sub.3 5 to 70% (SiO.sub.2 + B.sub.2 O.sub.3 = 50 to 70%) RO 5 to 30% (R: at least one atom selected from Mg, Ca, Sr and Ba) ZnO 0 to 15% ZrO.sub.2 0 to 10%, Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3 2 to 15% (containing either of Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3) Ln.sub.2 O.sub.3 0 to 20% (Ln: at least one atom selected from Y, La, Gd, Yb, Lu, Sm, Dy and Tm) CeO.sub.2 0 to 1% Bi.sub.2 O.sub.3 0 to 2% Sb.sub.2 O.sub.3 0.01 to 0.5% and R'.sub.

Abstract: An ultraviolet and infrared radiation absorbing glass having excellent ultraviolet radiation absorbing power and a bronze or neutral gray tint which is suitably used as a window glass for vehicles of automobiles and also as a window glass for construction materials is provided. The glass comprises, in % by weight: basic glass components comprising 65 to 80% SiO.sub.2, 0 to 5% B.sub.2 O.sub.3, 0 to 5% Al.sub.2 O.sub.3, 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na.sub.2 O, 0 to 5% K.sub.2 O, 5 to 15% MgO+CaO, and 10 to 20% Na.sub.2 O+K.sub.2 O, and coloring components comprising 0.20 to 0.50% total iron oxide (T-Fe.sub.2 O.sub.3) in terms of Fe.sub.2 O.sub.3, 0 to 3.0% CeO.sub.2, 0.025 to 6.0% La.sub.2 O.sub.3, 0 to 2.0% TiO.sub.2, 0.0002 to 0.005% CoO, 0.0002 to 0.005% Se, 0 to 0.01% NiO, and 0 to 1.0% SnO.sub.2, wherein 5 to 25% of said T-Fe.sub.2 O.sub.3 in terms of Fe.sub.2 O.sub.3 is FeO.

Abstract: A porcelain composition for dental restorations comprising a leucite crystallite phase and a glass matrix phase, wherein the leucite crystallites possess diameters not exceeding about 10 micron. Preferably, the porcelain composition has a maturing temperature from about 750.degree. to about 1050.degree. C. and a coefficient of thermal expansion from about 12.times.10.sup.-6 /.degree. C. to about 17.5.times.10.sup.-6 /.degree. C., and comprises:______________________________________ Component Amount (wt. %) ______________________________________ SiO.sub.2 57-66 Al.sub.2 O.sub.3 7-15 K.sub.2 O 7-15 Na.sub.2 O 7-12 Li.sub.2 O 0.5-3.

Abstract: The invention relates to glasses which absorb UV radiation and which have the following composition, in wt. %: SiO.sub.2 30-52; ZnO 0-8; B.sub.2 O.sub.3 12-22; PbO 0-2; ZrO.sub.2 5-14; Y.sub.2 O.sub.3 0-15; Al.sub.2 O.sub.3 0-12; La.sub.2 O.sub.3 5-25; Li.sub.2 O 1.5-3.5; TiO.sub.2 0-2; Na.sub.2 O 0-6; HfO.sub.2 0-2; K.sub.2 O 2-9; Nb.sub.2 O.sub.5 0-2; MgO 0-5; Ta.sub.2 O.sub.5 0-2; CaO 0-5; MoO.sub.3 0-2; SrO 0-9; WO.sub.3 0-2; BaO 0-14; SnO 0-4; Sb.sub.2 O.sub.3 0-4; SnO.sub.2 0-4; AS.sub.2 O.sub.3 0-4; CdO 0-1; CuO 0.15-1; F 0-2; Cl 0-3; Br 0-3; I 0-2 with the following conditions: Li.sub.2 O+Na.sub.2 O+K.sub.2 O (X.sub.2 O) 7-14; MgO+CaO+SrO+BaO (XO) 12-20; ZrO.sub.2 +Al.sub.2 O.sub.3 <15; F+Cl+Br+I 0.2-4.0; TiO.sub.2 +PbO+Nb.sub.2 O.sub.5 .ltoreq.2; AS.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +SnO.sub.2 +SnO 0.05-4.0 and a ratio R=(M.sub.2 O+2MO-Al.sub.2 O.sub.3 -ZrO.sub.2)/B.sub.2 O.sub.3 where M.sub.

Abstract: A novel type of glass having a low sodium content (<0.1 wt. % Na.sub.2 O), which can be used as a bulb glass (10) for "TL" lamps and for compact fluorescent lamps. Said glass is free of the toxic and/or corrosive components PbO, F, As.sub.2 0.sub.3 and Sb.sub.2 0.sub.3. Apart from favorable properties as regards phosphor poisoning and mercury absorption, resulting in a favorable maintenance of the lamp, said glass is characterized by a wide working range W.R. (=T.sub.work -T.sub.soft), so that glass tubing can be readily made of said glass. By virtue of the low liquidus temperature (T.sub.liq), the glass can be drawn into glass tubing which is free of crystals.

Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565.degree. C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.

Abstract: Glass having low solar radiation and ultraviolet ray transmittance, which consists essentially of a soda lime-silica type matrix glass containing from 0.53 to 0.70 wt % of total iron calculated as Fe.sub.2 O.sub.3, from 0.2 to 0.4 wt % of TiO.sub.2 and from 0.5 to 0.8 wt % of total cerium calculated as CeO.sub.2, wherein the weight of FeO calculated as Fe.sub.2 O.sub.3 is from 30 to 40% of the weight of the total iron calculated as Fe.sub.2 O.sub.3.

Abstract: The chemically prestressable glass having a low bubble count and bubble size has the following composition in mol %, based on a total amount of oxides present, SiO.sub.2 from 63.0 to 67.5 mol %, Al.sub.2 O.sub.3 from 9.5 to 12.0 mol %, Na.sub.2 O from 8.5 to 15.5 mol %, K.sub.2 O from 2.5 to 4.0 mol %, MgO from 3.0 to 9.0 mol %, sum of CaO+SrO+BaO+ZnO from 0 to 2.5 mol %, TiO.sub.2 from 0.5 to 1.5 mol %, CeO.sub.2 from 0.02 to 0.5 mol %, As.sub.2 O.sub.3 from 0.02 to 0.35 mol %, SnO.sub.2 from 0. to 1.0 mol %, and F.sub.2 from 0.05 to 2.6 mol %, wherein the molar ratio ?SiO.sub.2 !/?Al.sub.2 O.sub.3 ! is 5.3 to 6.85, the molar ratio ?Na.sub.2 O!/?K.sub.2 O! is 3.0 to 5.6, the molar ratio ?Al.sub.2 O.sub.3 !/?K.sub.2 O! is 2.8 to 3.6 and the molar ratio ?Al.sub.2 O.sub.3 !/?TiO.sub.2 +CeO.sub.2 ! is 7.6 to 18.5, but, when arsenic-free, SnO.sub.2 is from 0.02 to 1.0 mol % and F.sub.2 is from greater than 0.5 to 2.6 mol %.

Abstract: The disclosure describes a method for producing bulk, particulate material that includes solid, generally ellipsoidal particles by dispersing irregularly shaped feed particles including about 60 to 100% by weight of at least one silicate-containing material selected from among wollastonite, alkali feldspar, plagioclase feldspar and nepheline. While maintaining the feed particles in dispersion, they are heated sufficiently to bring about at least partial fusion within at least the surfaces of the particles. This produces a bulk particulate product of which about 15 to 100% by volume is generally ellipsoidal particles. Also described are compositions of matter including solid particles, at least a portion of which are substantially glassy and generally ellipsoidal. At least a portion of these particles have been respectively formed from feed particles composed substantially of at least one silicate selected from among wollastonite, alkali feldspar, plagioclase feldspar and nepheline.

Abstract: Soda lime glass includes glass forming constituents for soda lime glass; and coloring agents including iron, cobalt, selenium and chromium express in the form indicated and in an amount as percent by weight of the soda lime glass as follows:from 1.05 to 1.80% of Fe.sub.2 O.sub.3,from 0.0040 to 0.0180% of Co,from 0.0003 to 0.0040% of Se, andfrom 0.0010 to 0.0100% of Cr.sub.2 O.sub.3.The soda lime glass has a dark grey color, a total energy transmission measured for a glass thickness of 4mm (TE4) mm (TE4) ranging between 15 to 40%, a selectivity (SE4) which is high and is at least 1.2, and an excitation purity which does not exceed 10%. This glass is particularly suitable for automobile rear windows or rear side windows.

Abstract: Soda lime glass including glass-forming constituents for soda lime glass; and coloring agents including iron, cobalt and selenium present in a form and in an amount as percent by weight of the soda lime glass as follows:from 1.00 to 1.65% of Fe.sub.2 O.sub.3 ;from 0.017 to 0.030% of Co; andfrom 0.001 to 0.010% of Se.The soda lime glass has a very dark grey color, a total luminous transmission measured for Illuminant A for a glass thickness of 4 mm (TLA4) of less than 20%, and a total energy transmission measured for a glass thickness of 4 mm (TE4) of less than 20%. This glass is particularly suitable for vehicle roof panels.

Abstract: Green-tinted ultraviolet and infrared radiation absorbing glass suitable for use as a windowpane of vehicles, such as automobiles or buildings, is disclosed. The ultraviolet and infrared radiation absorbing glass comprises, in % by weight:basic glass components comprising65 to 80% SiO.sub.2,0 to 5% Al.sub.2 O.sub.3,0 to 10% MgO,5 to 15% CaO,10 to 18% of Na.sub.2 O,0 to 5% K.sub.2 O,5 to 15% MgO+CaO,10 to 20% Na.sub.2 O+K.sub.2 O, and0 to 5% B.sub.2 O.sub.3 ; andcoloring components comprising0.40 to 0.70% total iron oxide (T--Fe.sub.2 O.sub.3) in terms of Fe.sub.2 O.sub.3,1.4 to 1.7% of CeO.sub.2, and0 to 0.5t% of TiO.sub.2,wherein 27 to 40 wt% of the T--Fe.sub.2 O.sub.3 in terms of Fe.sub.2 O.sub.3 is FeO.

Abstract: An ultraviolet and infrared radiation absorbing glass having excellent ultraviolet radiation absorbing power and green tint, which is suitably used as a window glass for automobiles and constructional materials. The glass comprises, in % by weight: basic glass components comprising 65 to 80% SiO.sub.2, 0 to 5% Al.sub.2 O.sub.3, 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na.sub.2 O, 0 to 5% K.sub.2 0, 5 to 15% MgO+CaO, 10 to 20% Na.sub.2 O+K.sub.2 O, and 0 to 5% B.sub.2 O.sub.3, and coloring components comprising 0.4 to 1.5% total iron oxide (T-Fe.sub.2 O.sub.3) in terms of Fe.sub.2 O.sub.3, 0 to 3.0% CeO.sub.2, 0 to 2.0% TiO.sub.2, and 0.025 to 6.0% La.sub.2 O.sub.3, wherein 25 to 40% of said T-Fe.sub.2 O.sub.3 in terms of Fe.sub.2 O.sub.3 is FeO.

Abstract: Glasses for use as substrates for flat panel displays, having a composition consisting essentially of, as calculated in weight percent on an oxide basis, of 42-62 SiO.sub.2, 15-28 Al.sub.2 O.sub.3, 0-4 B.sub.2 O.sub.3, 3-10 Na.sub.2 O, 2-12 K.sub.2 O, 0-6 MgO, 9.5-24 CaO, 0-8 SrO, 0-16 BaO, 0-4 ZrO.sub.2 and 4-16 Li.sub.2 O+Na.sub.2 O+K.sub.2 O.

Abstract: The present invention provides a glass body with distributed composition which contains, for example, a rare-earth element having a concentration distribution, which can be produced in high yield while inhibiting cracking at the time of vitrification and which has optical properties advantageous in correcting chromatic aberration in image pickup systems. For example, in a four-component glass composed of SiO.sub.2, Al.sub.2 O.sub.3, Y.sub.2 O.sub.3 and ZrO.sub.2 in which Y.sub.2 O.sub.3 has a recessed parabolic concentration distribution profile being high at the periphery of the glass and low at the center of the glass and in which each of ZrO.sub.2 and Al.sub.2 O.sub.3 has a protrudent parabolic concentration distribution profile lowering from the center of the glass toward the periphery of the glass, there is the relationship:(.DELTA.C.sub.Al /.DELTA.C.sub.Ml)/C.sub.Si =0.0334wherein .DELTA.C.sub.Ml is a concentration distribution difference of Y.sub.2 O.sub.3, .DELTA.C.sub.

Abstract: Glasses for use as substrates for flat panel displays, having a composition consisting essentially of, as calculated in weight percent on an oxide basis, 38-56 SiO.sub.2, 10-28 Al.sub.2 O.sub.3, 0-4 Li.sub.2 O, 0-6 Na.sub.2 O, 0-15 K.sub.2 O, 4-18 CaO, 0-5 MgO, more than 8 and less than or equal to about 24 SrO, 0-2 ZrO.sub.2, said glass further consisting essentially of Na.sub.2 O+K.sub.2 O in total between about 6 and 18 weight percent.

Abstract: A shaped, high-strength dental ceramic prosthesis is made by pressing a molding composition including from about 1 to 50 percent by weight glass particles and from about 99 to about 50 percent by weight inorganic oxide particles at a pressure of from about 10 to about 40 MPa and a temperature of from about 1000.degree. to about 1200.degree. C. Dental prostheses prepared in accordance with the invention include crowns, bridges, inlays and onlays.

Abstract: The present invention relates to glass compositions suitable for the manufacture of glazings for use in the architectural field or for fitting in motor vehicles. These compositions contain the following constituents with the contents, express in weight percentages, defined by the following limits:SiO.sub.2 69 to 75%Al.sub.2 O.sub.3 0 to 3%CaO 2 to 10%MgO 0 to 2%Na.sub.2 O 9 to 17%K.sub.2 O 0 to 8%Fe.sub.2 O.sub.3 (total iron) 0.2 to 1.5%These compositions can also contain fluorine, as well as oxides of zinc, zirconium, carium, titanium and less than 4% barium oxide, the sum of the percentages of the alkaline earth oxides remaining equal to or below 10%.

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: The object of the present invention is to provide an absorber glass for FOP having a broad absorption band which extends from ultraviolet region through visible region to near infrared region. The absorber glass of the present invention contains 18 to 40% by weight of SiO.sub.2 and not smaller than 20% by weight of FeO and Fe.sub.2 O.sub.3 in total.

Abstract: The invention is a green soda-lime-silica glass composition having excellent ultra violet absorbing ability while having a relatively high light transmittance. The colorants of the glass composition consist essentially of: greater than 0.5 to 1.5 wt. % total iron oxide as Fe.sub.2 O.sub.3 ; wherein the weight ratio of Fe.sup.+2 /Fe.sup.+3 is less than 0.35; 0.10 to 2.00 wt. % manganese compound as MnO.sub.2 ; and optionally any of: up to 1.00 wt. % titanium oxide as TiO.sub.2, up to 1.00 wt. % cerium oxide as CeO.sub.2 ; up to 1.00 wt. % vanadium oxide as V.sub.2 O.sub.5 ; and up to 0.20 wt. % chromium oxide as Cr.sub.2 O.sub.3 ; the glass composition having, at 4.0 mm. thickness: 55 to 80% light transmittance using Illuminant A with less than 46% ultra violet transmittance measured over the range of 300 to 400 nanometers.

Abstract: Ultraviolet ray absorbing colored glass, which comprises 100 parts by weight of soda lime silicate glass as a base component and coloring components consisting essentially of from 0.12 to 0.7 part by weight of total iron as calculated as Fe.sub.2 O.sub.3, from 0.2 to 2.0 parts by weight of total cerium as calculated as CeO.sub.2, from 1.0 to 2.5 parts by weight of total titanium as calculated as TiO.sub.2, from 0 to 0.01 part by weight of CoO and from 0.0001 to 0.02 part by weight of Se, and which has an ultraviolet ray transmittance of at most 10%, as stipulated in ISO-9050 and as calculated as of a thickness of 5 mm, whereby the dominant wavelength measured by illuminant C is within a range of from 565 to 600 nm.

Abstract: An optical glass containing, as glass components,30.about.55 wt % of SiO.sub.2,5.about.30 wt % of B.sub.2 O.sub.3,the total amount of SiO.sub.2 and B.sub.2 O.sub.3 being 56.about.70 wt % and the SiO.sub.2 /B.sub.2 O.sub.3 weight ratio being 1.3.about.12.0,7.about.12 wt % of Li.sub.2 O, in which 7 wt % is excluded,0.about.5 wt % of Na.sub.2 O,0.about.5 wt % of K.sub.2 O,the total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O being 7 to 12 wt % in which 7 wt % is excluded,10.about.30 wt % of BaO,0.about.10 wt % of MgO,0.about.20 wt % of CaO,0.about.20 wt % of SrO, and0.about.20 wt % of ZnOthe total amount of BaO, MgO, CaO, SrO and ZnO being 10.about.30 wt %, and the total amount of SiO.sub.2, B.sub.2 O.sub.3, Li.sub.2 O and BaO being at least 72 wt %.

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 object of the present invention is to provide an absorber glass for FOP having a broad absorption band which extends from ultraviolet region through visible region to near infrared region. The absorber glass of the present invention contains FeO, 18 to 40% by weight of SiO.sub.2 and not less than 20% by weight of FeO and Fe.sub.2 O.sub.3 in total.

Abstract: A transparent glass exhibiting a light pink color, the glass, as analyzed, consisting essentially of 12-34 ppm selenium in conjunction with a co-colorant selected from a group consisting of 1.5-7 ppm cobalt oxide calculated as Co.sub.3 O.sub.4 and 500-700 ppm neodymium oxide in a soda lime silicate base glass that contains as impurities no more than about 700 ppm MnO.sub.2 and 500 ppm Fe.sub.2 O.sub.3.

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: 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: A two-phase porcelain composition for dental restorations comprising a leucite crystallite phase dispersed in a feldspathic glass matrix, a maturing temperature of from about 750.degree. to about 1050.degree. C. and a coefficient of thermal expansion of from about 12.times.10.sup.-6 /.degree.C. to about 17.5.times.10.sup.-6 /.degree.C., said porcelain composition comprising:______________________________________ Component Amount (wt. %) ______________________________________ SiO.sub.2 57-66 Al.sub.2 O.sub.3 7-15 K.sub.2 O 7-15 Na.sub.2 O 7-12 Li.sub.2 O 0.5-3 CaO 0-3 MgO 0-7 F 0-4 CeO.sub.2 0-1 ______________________________________wherein the leucite crystallites possess diameters not exceeding about 10 microns and represent from about 5 to about 65 weight percent of the two-phase porcelain composition.

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: A glass composition, particularly well suited for use in constructing sodium containing lamp envelopes. The glass composition is comprised of silica doped with yttrium and/or cesium, preferably in combination aluminum.

Abstract: Alkali-zinc-silicate glass ceramics and glasses are described which have a linear thermal expansion coefficient in the range from 8.0 to 18.7.times.10.sup.-6 K.sup.-1, an excellent chemical resistance and other advantageous optical properties and can be used in particular as dental material.

Abstract: Ultraviolet (UV) radiation in the UV-C and UV-B bands, which is particularly dangerous, is absorbed and filtered by quartz glass doped with between 0.065% and 3.25%, and preferably between 0.065% and 1.3% by weight, of cerium metal, or cerium as such. Preferably, the cerium is added to quartz sand and/or rock crystal, in form of a fine-grained powder of up to 2 0 .mu.m grain size, in form of cerium aluminate (CeAlO.sub.3), present in up to about 5% by weight, and preferably up to about 2%, and melted together in a single step. The quartz glass so obtained is particularly suitable for a metal halide discharge lamp, e.g. as an outer envelope (1), or as the discharge vessel (27) itself, or for halogen incandescent lamps, to form the quartz-glass light bulb or an envelope therefor. A small quantity of titanium oxide, up to about 0.05%, may be added as a further doping agent to the melt to further improve the UV absorption in the B and C bands.

Abstract: A lithium-free glass composition containing 64 to 75% SiO.sub.2, 11 to 16% total of a matrix compound selected from a first group which is B.sub.2 O.sub.3, and BaO, or from a second group which contains Al.sub.2 O.sub.3, MgO, CaO and ZnO, above 10% Na.sub.2 O as a modifier, 0 to 7% K.sub.2 O as a modifier, and 0.1 to 15% Ce.sub.2 O.sub.3 as a dopant. When the matrix compound is a member of the group B.sub.2 O.sub.3 and BaO, MgO, CaO and ZnO can be present in an amount of 0 to 5% as an additional modifier. The glass of the invention has the properties of high transmittance of radiation of wavelength greater than 370 m.mu., substantially complete absorbance of radiation of wavelength below 350 m.mu., and detection of ultraviolet and ionizing radiation with a decay of luminescence of below 45 nanoseconds.

Abstract: A low-fusing temperature porcelain composition for use in dental prostheses is disclosed having a fusing temperature of about 700.degree. C..+-.50.degree. C. and a coefficient of thermal expansion compatible with a substrate of metal or ceramic. The composition includes, in weight percent of the composition, SiO.sub.2 at 57-61, Al.sub.2 O.sub.3 at 6.5-11.5, Na.sub.2 O at 10-11, K.sub.2 O at 8-16, Li.sub.2 O at 1-3, CaO at 1.5-4, BaO at 1.5-2.5, CeO.sub.2 at 0.5-2, and Tb.sub.2 O.sub.3 at 0.5-2.

Abstract: An electric lamp has a light source which has an envelope of doped quartz glass. The quartz glass including silicon, cerium, titanium, europium and aluminium in oxidic form. Cerium accounts for 0.1-0.2, titanium for 0.01-0.04, europium for 0.03-0.2 and aluminium for at most 0.8 at % of the cationogenous elements. The aluminium/europium atomic ratio lies in the region from 3 to 8. The doped quartz glass is at least substantially transparent to visible radiation and at least substantially impervious to UV radiation.

Abstract: An electric arc discharge lamp having an arc discharge light source which emits both visible light radiation and UV radiation enclosed within an anti-solarization borosilicate glass envelope which is lead and arsenic free and having a transmission of greater than 90% at a wave length of 425 nm and a transmission of not more than 40% of said UV radiation at 320 nm; 8% of said UV radiation at 300 nm; and 0.5% of said UV radiation at 290 nm; said borosilicate glass comprising, in weight percent: from about 3.89% Na.sub.2 O; about 1.5% K.sub.2 O; about 0.15% Li.sub.2 O; about 17% B.sub.2 O.sub.3 ; about 1.4% Al.sub.2 O.sub.3 ; about 0.6% CaO; about 0.35% MgO; about 0.15% CeO.sub.2 ; from about 0.075% to about 0.30% SnO.sub.2 ; and the balance SiO.sub.2. Also, a glass having the above composition.

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: This invention is directed to the production of glasses essentially free of Nb.sub.2 O.sub.5, and having refractive index close to 1.7, an Abbe number of about 35 and a density close to 3.2. The glasses consist essentially in weight percent on the oxide basis, of______________________________________ SiO.sub.2 38-45 TiO.sub.2 15-<20 ZrO.sub.2 6-10 La.sub.2 O.sub.3 0.5-4 BaO 12-19 CaO 3-8 BaO + CaO + SrO 17-25 Na.sub.2 O 2-6 K.sub.2 O 4-8 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 6-10.

Abstract: An ivory-colored, opaque glass-ceramic having a beta-spodumene solid solution as its primary crystal phase, and a method of controlling color in the glass-ceramic. The glass-ceramic is produced from a Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 precursor glass containing 3-6% TiO.sub.2 +ZrO.sub.2 as a nucleating agent and having colorants controlled at levels of up to 20 ppm Co.sub.3 O.sub.4, up to 1000 ppm Fe.sub.2 O.sub.3 and 1000-2000 ppm CeO.sub.2.

Abstract: This invention is directed to glass compositions particularly designed for use in rear projection tube applications. The glass compositions are essentially free from ZnO, PbO and other easily reducible metal oxides other than Sb.sub.2 O.sub.3 and are essentially colorless. The glasses exhibit essentially no browning discoloration upon being exposed to high voltage electrons, linear coefficients of thermal expansion (25.degree.-300.degree. C.) between about 97-100.times.10.sup.-7 .degree. C., annealing points not lower than about 475.degree. C., strain points not lower than about 440.degree. C., electrical resistivities expressed as Log R greater than 9 at 250.degree. C. and greater than 7 at 350.degree. C., and liquidus temperatures below about 1100.degree. C. The glass compositions consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 55-60 K.sub.2 O 5.75-10 Al.sub.2 O.sub.3 1-3 Na.sub.2 O + K.sub.2 O 10.5-14 ZrO.sub.2 0-3.5 K.sub.

Abstract: Robust, large area selective infrared line emitters can be made using composites of rare earth metal compound particulates dispersed and interlocked in a network of connected structure-forming fibers having an emissivity less than about 0.1 in the range 0.7-5 microns. Articles where the composite is formed of rare earth metal oxide fibers in a network of sinter-bonded quartz fibers show narrow bandwidth emissions with good thermal conversion efficiencies.

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: An opalescent glass is described which is characterized by a continuous glass phase and a discontinuous glass phase dispersed therein, and which can be used as dental material or as a constituent of dental materials.