Abstract: Low temperature melting lead-free glass and enamel compositions are provided which have low boron content and possess high durability properties. Enamel pastes containing frits of the glass compositions are particularly useful in forming colored borders in automotive glass.

Abstract: When ceramic electronic parts such as multilayer ceramic substrates that have a substrate body and metal wiring conductors comprising silver are manufactured, a composition comprising not only a borosilicate glass powder and a ceramic powder, but also an additive powder comprising at least one of cerium oxide, bismuth, bismuth oxide, antimony and antimony oxide is used as a composition for preparing the substrate body. Gray discoloration of the substrate body and yellow discoloration in the vicinities of the metal wiring conductors can be prevented.

Abstract: The invention concerns an optical colored glass with a composition (in percent by weight based on oxide) of

Abstract: An optical amplifier glass comprising a matrix glass containing Bi2O3 and at least one of Al2O3 and Ga2O3, and Er doped to the matrix glass, wherein from 0.01 to 10% by mass percentage of Er is doped to the matrix glass which has a total content of Al2O3 and Ga2O3 of at least 0.1 mol %, a content of Bi2O3 of at least 20 mol %, a refractive index of at least 1.8 at a wavelength of 1.55 &mgr;m, a glass transition temperature of at least 360° C. and an optical basicity of at most 0.49.

Abstract: Materials for making a plasma display having a transparent front panel spaced from a back panel which is a metal core having layers of a dielectric material extending over and bonded to the core. The materials of which the back panel is made are chosen to form a back panel having a thermal coefficient of expansion compatible with that of the front panel. The dielectric material is made from a green ceramic tape which is bonded to the core and cofired with the core to form the back panel. The materials for the dielectric can be chosen such that the composite TCE of the cofired assembly matches the TCE of the front panel.

Abstract: A crystallized glass composition contains a principal ingredient comprising SiO2, MgO and Al2O3 and contains about 2 to 20 parts by weight of B2O3 relative to 100 parts by weight of the principal ingredient. In a ternary diagram, the weight ratio (SiO2, MgO, Al2O3) lies within a region surrounded by point A (44.0, 55.0, 1.0), point B (34.5, 64.5, 1.0), point C (35.0, 30.0, 35.0) and point D (44.5, 30.0, 25.5).

Abstract: To provide an optically transparent film containing 0.01 to 20% by weight glass forming oxide consisting of Nb2O5, V2O5, B2O3, SiO2, and P2O6; 0.01 to 20% by weight Al2O3 or Ga2O3; and 0.01 to 5% by weight hard oxide of ZrO2 and TiO2 as required; balance being ZnO, and a sputtering target for forming such a film. This sputtering target reduces occurrence of particles during sputtering, decreases the number of interruption or discontinuance of sputtering to improve production efficiency, and forms a protective film for optical disks with large transmittance and low reflectance.

Abstract: This invention relates to a process for producing zeolite-bound high silica zeolites and the use of the zeolite-bound high silica zeolite produced by the process for hydrocarbon conversion. The process is carried out by forming an extrudable paste comprising a mixture of high silica zeolite in the hydrogen form, water, silica, and optionally an extrusion aid, extruding the extrudable paste to form silica-bound high silica zeolite extrudates, and then converting the silica of the binder to a zeolite binder. The zeolite-bound high silica zeolite produced by the process comprises high silica zeolite crystals that are bound together by zeolite binder crystals. The zeolite-bound high silica zeolite finds particular application in hydrocarbon conversion processes, e.g., catalytic cracking, alkylation, disproportionation of toluene, isomerization, and transalkylation reactions.

Abstract: A borosilicate glass composition comprises SiO2 having a concentration of about 40 mole percent to about 60 mole percent, B2O3 having a concentration of about 10 mole percent to about 30 mole percent, and an alkaline earth and/or alkali compound having a concentration of 10 mole percent to about 40 mole percent. An optical fiber amplification device comprises a borosilicate glass material cladding. The core comprises a germanate glass material doped with Tm3+. The germanate glass material has a first surface configured to receive an optical signal having a wavelength of from about 1400 nm to about 1540 nm and a second surface configured to output an amplified optical signal. In this manner, low cost fiber amplifiers in the 1450-1530 nm wavelength region (corresponding to the S-band) can be achieved.

Abstract: The present invention provides a ground coat composition for use in forming an enamel layer on sheet steel that exhibits good spot acid resistance, a satin finish, good bond, and is easy-to-clean. The composition according to the invention includes a glass component that includes a blend of from about 40% to about 70% by weight of a first glass portion including one or more alkali aluminophosphate frits, up to about 30% by weight of a second glass portion including one or more zirconia-phosphate frits, and up to about 30% by weight of a third glass portion including one or more alkali borosilicate frits.

Abstract: There is provided an optical glass suitable for mold pressing having optical constants of a refractive index (nd) within a range from 1.60 to 1.69 and Abbe number (&ngr;d) within a range from 35 to 45, having a glass transition point (Tg) within a range from 400° C. to 500° C., being free from devitrification when the optical glass is held at a temperature which is higher by 100° C. than the glass transition point (Tg) for 30 minutes, and comprising in mass % on oxide basis: 1 SiO2 20 - less than 40% B2O3  5-20% Al2O3  0-5% ZrO2 more than 3%-15% Nb2O5 10-30% MgO + CaO  0 - less than 5% in which MgO  0 - less than 5% CaO  0 - less than 5% SrO  0-10% BaO  0-10% ZnO  0-18% Li2O  1-15% Na2O  1-10% K2O  1-10% Sb2O3  0-1%.

Abstract: According to one aspect of the present invention an optically active glass contains Sb2O3, up to about 4 mole % of an oxide of a rare earth element, and 0-20 mole % of a metal halide selected from the group consisting of a metal fluoride, a metal bromide, a metal chloride, and mixtures thereof, wherein this metal is a trivalent metal, a divalent metal, a monovalent metal, and mixtures thereof. In addition, any of the glass compositions described herein may contain up to 15 mole % B2O3 substituted for an equivalent amount of Sb2O3.

Abstract: A low melting point glass for covering electrodes, which contains Cu in a content as calculated as CuO within a range of from 0.1 to 0.9% by mass percentage and which contains neither Mo or Sb.

Abstract: A discharge lamp, suitable for operation by means of dielectrically impeded discharge, having electrodes arranged on the wall of the discharge vessel, has at least one dielectric layer which covers at least a part of the electrodes and, optionally, the discharge vessel wall as well. A phosphor and/or reflective layer is arranged on the at least one dielectric layer. According to the invention, at least the dielectric layer arranged directly underneath the phosphor or reflective layer consists of a glass solder whose viscosity variation as a function of temperature is irreversible, in particular of a sintered glass ceramic. This prevents this layer from re-melting during the fabrication process and thereby tearing the overlying porous reflective and/or phosphor layers.

Abstract: There is disclosed a composition for a ceramic substrate comprising a mixture of: powdered borosilicate-based glass comprising about 5% to 17.5% by weight of B2O3, about 28% to 44% by weight of SiO2, 0% to about 20% by weight of Al2O3, and about 36% to 50% by weight of MO (where MO is at least one selected from the group consisting of CaO, MgO, and BaO), and a powdered ceramic; in which the amount of the powdered borosilicate-based glass is about 40% to 49% by weight based on the total amount of the composition for a ceramic substrate, and the amount of the powdered ceramic is about 60% to 51% by weight based on the total amount of the composition for a ceramic substrate.

Abstract: The present invention relates to an oxyhalide glass matrix including 0-70 mol. % SiO2, 5-35 mol. % Al2O3, 1-50 mol. % B2O3, 5-35 mol. % R2O, 0-12 wt. % F, 0-12 wt. % Cl, and 0 to 0.2 mol. % rare earth element, wherein R is Li, Na, K, Rb, or Cs. The present invention further relates to a method of producing the glass matrix and to a method of modifying the spectral properties of an oxyhalide glass.

Abstract: When a glass melt of an optical glass having a refractive index (nd) of at least 1.7 and an Abbe number (&ngr;d) of 28 to 41 is flowed down from a flow pipe made of Pt or a Pt alloy to form glass gobs continuously, there is caused a problem that the glass gobs have striae or that the weight variability among the glass gobs is large, and the problem can be overcome by the use of an optical glass comprising silicon oxide and boron oxide, the ratio of a content of the silicon oxide to a content of the boron oxide being greater than 0.78, the optical glass having a contact angle of at least 40° to Pt or a Pt alloy at a predetermined temperature equivalent to, or higher than, its liquidus temperature or in a predetermined temperature range whose lower limit is equivalent to, or higher than, the liquidus temperature and having a sag temperature Ts of 580° C. or lower.

Abstract: The invention relates to lead-free optical glasses having a refractive index nd of from 1.52 to 1.58, an Abbe number vd of from 50 to 57 and a negative partial dispersion &Dgr;Pg,F of <−0.0090, having a composition (in % by weight, based on oxide) of SiO2>15-25; B2O3 45-55; Al2O3 8-13; CaO 2-8; ZnO 0-5; with CaO+ZnO 2-10; Li2O 0-4; Na2O 0-4; K2O 0-4; with Li2O+Na2O+K2O 3-8; La2O3 0-14; Nb2O5 0-4.8; Ta2O5>10-17; with Ta2O5+Nb2O5>10-17; SnO2 0-2; ZrO2 0-7; with Ta2O5+ZrO2>10-<18.

Abstract: A low temperature-fired porcelain article includes a barium component in an amount of 40 to 65 wt % when calculated as BaO, a silicon component in an amount of 25 to 46 wt % when calculated as SiO2, an aluminum component in an amount of 0.1 to 20 wt % when calculated as Al2O3, a boron component in an amount of 0.3 to 1.5 wt % when calculated as B2O3, and a zinc component in an amount of 0.5 to 20 wt % when calculated as ZnO, optionally also a chromium component in an amount of 0.5 to 3.5 wt % when calculated as Cr2O3 wherein the porcelain article has a dielectric constant ∈r of not more than 10, a quality coefficient Q of not less than 2500, and preferably has an absolute value of a temperature coefficient &tgr;f of the resonance frequency of not more than 30 ppm/° C.

Abstract: The glass or glass-ceramic has the following composition (in % by weight based on oxide content): SiO2, 25 to 50; B2O3, >5 to 16; Al2O3, 10 to 17; P2O5, 0 to 8; Li2O,5 to 15; Na2O, 0 to 10; K2O, 0 to 10; MgO, 10 to 30; CaO, 0 to 10; SrO, 0 to 8; ZnO, 0 to 8; TiO2, 0.1 to 10; ZrO2, 0 to 8; and at least one refining agent, in an amount as needed according to its purpose. The sum total amount of divalent metal oxides (RO) present is less or equal to than 45% by weight based on oxide content and the sum total amount of alkali metal oxides (R2O) present is less than or equal to 30% by weight based on oxide content. The glass or glass-ceramic material generally has elasticity modulus values (E)>90×103 N/mm2 and <125×103 N/mm2, specific elasticity modulus values (E/&rgr;)>30×105 N cm/g and <45×105 N cm/g and thermal expansion coefficient values (&agr;20/300)>7.0×10−6/K and <11.0×10−6/K.

Abstract: There is disclosed a composition for a ceramic substrate comprising a mixture of: powdered borosilicate-based glass comprising about 5% to 17.5% by weight of B2O3, about 28% to 44% by weight of SiO2, 0% to about 20% by weight of Al2O3, and about 36% to 50% by weight of MO (where MO is at least one selected from the group consisting of CaO, MgO, and BaO), and a powdered ceramic; in which the amount of the powdered borosilicate-based glass is about 40% to 49% by weight based on the total amount of the composition for a ceramic substrate, and the amount of the powdered ceramic is about 60% to 51% by weight based on the total amount of the composition for a ceramic substrate.

Abstract: Glass for a light filter capable of preventing variation of refractive index in a band-pass filter has a coefficient of thermal expansion within a range from 90×10−7/° C. within a temperature range from −20° C. to +70° C. and, preferably, Young's modulus of 75 GPa or over and Vickers hardness of 550 or over, and light transmittance for plate thickness of 10 mm of 90% or over within a wavelength range from 950 nm to 1600 nm.

Abstract: A barium borosilicate glass which consists essentially of, as represented by mass% based on the following oxides: B2O3 5 to 35%, SiO2 0.5 to 30%, BaO 25 to 75%, Al2O3 0.5 to 13%, SnO2 0 to 2%, CeO2 0 to 2%, MgO + CaO + SrO 0 to 10%, ZnO 0 to 20%, TiO2 0 to 5%, ZrO2 0 to 5%, Li2O 0 to 5%, Na2O 0 to 5%, and K2O 0 to 5%.

Abstract: An insulating ceramic compact is provided which can be obtained by low-temperature firing, has a low relative dielectric constant and superior high frequency characteristics, and can be co-sintered with a material having a high coefficient of thermal expansion. The insulating ceramic compact is a fired mixture of an MgAl2O4-based ceramic and a borosilicate glass, in which an MgAl2O4 crystal phase and at least one of an Mg3B2O6 crystal phase and an Mg2B2O5 crystal phase are precipitated as primary crystal phases.

Abstract: An optical glass wherein an amount of change in refractive index (&Dgr;n: difference in refractive index between a state before radiation and a state after radiation) caused by radiation of laser beam at wavelength of 351 nm having average output power of 0.43W, pulse repetition rate of 5 kHz and pulse width of 4OO ns for one hour is 5 ppm or below is provided. The optical glass comprises a fluorine ingredient and/or a titanium oxide ingredient and/or an arsenic oxide ingredient. The optical glass suffers little change in refractive index by radiation of strong light having wavelengths of 300 nm to 400 nm such as ultraviolet laser.

Abstract: Low temperature melting lead-free glass and enamel compositions are provided which have low boron content and possess high durability properties. Enamel pastes containing frits of the glass compositions are particularly useful in forming colored borders in automotive glass.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: An optical amplifier glass comprising a matrix glass containing Bi2O3 and at least one of Al2O3 and Ga2O3, and Er doped to the matrix glass, wherein from 0.01 to 10% by mass percentage of Er is doped to the matrix glass which has a total content of Al2O3 and Ga2O3 of at least 0.1 mol %, a content of Bi2O3 of at least 20 mol %, a refractive index of at least 1.8 at a wavelength of 1.55 &mgr;m, a glass transition temperature of at least 360° C. and an optical basicity of at most 0.49.

Abstract: A tin-borophosphate glass of the present invention has main components of SnO, B2O3, and P2O5, consists essentially of, by mole % representation, 30-70% SnO, 5-30% B2O3, and 24-45% (24% exclusive) P2O5, and satisfies a condition of B2O3/P2O5≧0.20 by mole ratio.

Abstract: A tin borophosphate glass for use in sealing materials includes, by mole, 30 to 80% of SnO, 5 to 60% of B2O3, and 5 to 24% of P2O5 as main components. The glass is free of lead but is of equal quality to those of conventional lead-containing sealing glasses. The glass can provide a satisfactory sealing material.

Abstract: The invention relates to methods of vitrifying waste and for lowering the melting point of glass forming systems by including lithia formers in the glass forming composition in significant amounts, typically from about 0.16 wt % to about 11 wt %, based on the total glass forming oxides. The lithia is typically included as a replacement for alkali oxide glass formers that would normally be present in a particular glass forming system. Replacement can occur on a mole percent or weight percent basis, and typically results in a composition wherein lithia forms about 10 wt % to about 100 wt % of the alkali oxide glass formers present in the composition. The present invention also relates to the high lithia glass compositions formed by these methods.

Abstract: A ceramic composition is provided with a glass based material including SiO2, Al2O3, B2O3, and at least one selected from a group of Cao and MgO, and particles dispersed in the glass based material. The particles includes CaSiO3 or MgSiO3 as a main component. A sintered state of the ceramic composition has an anti-bending strength of 1500 kg/cm2 or higher.

Abstract: A primarily polycrystalline but partially amorphous electrical insulator can hermetically seal first and second spaced electrical terminals, one made from an anodized aluminum and the second made from a beryllium copper or Kovar or an alloy of beryllium, copper, nickel and gold. Nickel may be diffused into the beryllium copper and a noble metal may be deposited on the nickel. The insulator provides a flat meniscus to abut a corresponding electrical insulator in a cable. The insulator may provide an electrical impedance of approximately 50 ohms, an electrical resistivity greater than approximately 1018 ohms and a dielectric constant of approximately 6.3. The insulator operates satisfactorily in a frequency range to approximately 40 gigahertz.

Abstract: Lead-free alkali metal-free bismuth-borosilicate glass compositions are disclosed. These compositions are useful in preparing glass frits which are employed in glass enamel compositions which, in turn, are used to prepare glass enamel pastes. The glass enamel pastes can be coated on non-porous substrates and fused to form decorative and functional coatings on the substrates.

Abstract: An inorganic composition for low temperature firing comprising about 15 to 40 weight % of glass powder and about 60 to 85 weight % of cordierite, is disclosed. The glass powder is composed of about 20 to 60 weight % of SiO2, about 30 to 50 weight % of B2O3, about 5 to 30 weight % of MgO, 0 to about 15 weight % of Al2O3, and about 1 to 5 weight % of R2O (R is alkali metal). The inorganic composition is capable of being fired at a relative low temperature, and has a low thermal expansion coefficient and permittivity, as well as high mechanical strength.

Abstract: Glass microspheres and rear projection screens containing glass microspheres, which combine a desirable index of refraction (preferably, no greater than about 1.70) and low levels of defects (e.g., bubbles, visible haziness, frostiness, or opacity, substantially nonspherical shapes) upon formation are provided. Also provided is a coating method of placing microspheres on a film for use in a rear projection screen.

Abstract: A fixed tint, photochromic glasses and sunglass lenses produced therefrom. The glasses have R2O—Al2O3—B2O3—SiO2 base compositions, contain silver chloride and bromide contents as photochromic constituents and 0.27-0.38% and 0.035-0.060%, both by weight percent, as glass colorants, the NiO:Co3O4 ratio being at least 6:1.

Abstract: A glass composition comprising, in mole percent of the total composition: glass-forming compounds in a total amount of 75 to 85%, wherein said glass forming compounds comprise 40 to 65% SiO2, 10 to 20% Bi2O3 and 0.1 to 3% Al2O3, and glass modifiers in a total amount of 15 to 25%, wherein said glass modifiers comprise 1 to 23 % ZnO, 0.1 to 5% CuO, 0.1 to 5 CaO and 0.1 to 2% MgO, thick film formulations containing said composition and uses thereof.

Abstract: A fixed tint, photochromic glasses and sunglass lenses produced therefrom. The glasses have R.sub.2 O--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 base compositions, contain silver chloride and bromide contents as photochromic constituents and 0.22-0.38% NiO and 0.034-0.060% CoO, both by weight percent, as glass colorants, the NiO:CoO ratio being in the range of 5.5-7.2:1.

Abstract: The present invention provides a coating layer of the coke oven having a high strength, high impact resistance and excellent smoothness to enable long term protection of the fire brick of the coke oven. Carbon adhered to the brick can be removed by spraying a coating agent with a glaze layer mainly composed of 18 to 70% by weight of SiO.sub.2 and 10 to 60% by weight of Na.sub.2 O and/or K.sub.2 O and containing one or a plurality of 2 to 14% by weight of P.sub.2 O.sub.5, 0.5 to 25% by weight of BaO, 0.5 to 25% by weight of SrO and 0.5 to 20% by weight of Fe.sub.2 O.sub.3 onto the surface of a high temperature firebrick, thereby obtaining an excellent coating layer.

Abstract: The glasses used for making rigid disk substrates have the following composition (based on the % by weight of the oxides): SiO.sub.2, 40 to 60; Al.sub.2 O.sub.3, 5 to 20; B.sub.2 O.sub.3, 0 to 5; Li.sub.2 O, 0 to 10; Na.sub.2 O, 0 to 12, with the proviso that Li.sub.2 O+Na.sub.2 O 5 to 12; K.sub.2 O, 0 to 5; MgO, 0 to 20; CaO, 0 to 6, with the proviso that MgO+CaO, 4 to 20,SrO+BaO, 0 to 10; Zr.sub.2 O, 0 to 5; TiO.sub.2, 0 to 5; CeO.sub.2, 0 to 1; La.sub.2 O.sub.3, 0 to 10; Fe.sub.2 O.sub.3, 0 to 10; Nb.sub.2 O.sub.5, 0 to 10; V.sub.2 O.sub.5, 0 to 15, with the proviso that TiO.sub.2 +ZrO.sub.2 +La.sub.2 O.sub.3 +Fe.sub.2 O.sub.3 +Nb.sub.2 O.sub.3 +V.sub.2 O.sub.5 .gtoreq.8, As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +F, 0.1 to 1; or, SiO.sub.2, 10 to 30; Al.sub.2 O.sub.3, 0 to 5; B.sub.2 O.sub.3, 0 to 8; Li.sub.2 O, 0 to 8; Na.sub.2 O, 1 to 10, with the proviso that Li.sub.2 O+Na.sub.2 O, 5 to 10; K.sub.2 O, 0 to 3; MgO, 0 to 12; CaO, 0 to 15, with the proviso that MgO+CaO,10 to 15, SrO+BaO, 0 to 8; Zr.sub.

Abstract: A fused-cast-alumina-zirconia-silica refractory consisting essentially of corundum crystals, baddeleyite crystals and a matrix glass phase and having a chemical composition comprising (a) from 30 to 70 wt % of Al.sub.2 O.sub.3, (b) from 20 to 59 wt % of ZrO.sub.2, (c) from 5 to 12 wt % of SiO.sub.2, (d) from 0.15 to 0.60 wt % of Na.sub.2 O, (e) from 0 to 0.50 wt % of K.sub.2 O, (f) from 0 to 0.40 wt % of Li.sub.2 O, (g) from 0.05 to 0.80 wt % of B.sub.2 O.sub.3, (h) from 0.05 to 0.80 wt % of P.sub.2 O.sub.5, and (i) from 0.05 to 0.50 wt % in total of at least one member selected from the group consisting of SnO.sub.2, ZnO, CuO and MnO.sub.2.

Abstract: Multiphase ceramic materials for use in multilayered device fabrication may be fabricated by providing novel glassy precursor materials of a preferred composition, with operable amounts of a non-glassy filler materials. The combined materials are fired at appropriate temperatures, so that a non-glassy anorthite type phase is formed. Material so fabricated is formed in a self-limiting process, in that reaction between the glassy precursor material and the non-glass filler material is terminated when one constituent of the glassy precursor material is fully consumed. The materials of the instant invention, fabricated according to the method disclosed herein, demonstrate excellent dielectric constant, and electrical loss characteristics.

Abstract: The invention relates to a strong UV absorbing glass consisting essentially of, expressed in cation percent, 15-30% SiO.sub.2, 50-60% B.sub.2 O.sub.3, 2-5% Al.sub.2 O.sub.3, 0-6% Li.sub.2 O, 0-3.0% Na.sub.2 O, 14-20% K.sub.2 O, 0.5-1.0% CuO, 0.4-0.7% SnO.sub.2, 0.5-1.5% Cl, and 0.7-1.5% Br. An essentially haze-free version of the glass is disclosed. A UV absorbing coating material made by suspending ground particles of the inventive glass in a suitable matrix is also disclosed.

Abstract: The present invention provides high temperature sealing glass compositions for use in producing mechanically and chemically durable electrically insulating hermetic glass seals between materials such as zirconia, alumina, fosterite, steatite, carbon steels, stainless steels, and superalloys. High temperature sealing glass compositions according to the present invention include a glass component and optional vehicles. The glass component includes one or more glass frits containing in weight percent from about 17% to about 56% BaO+SrO, from about 18% to about 60% SiO.sub.2, from about 6% to about 36% B.sub.2 O.sub.3, from about 2% to about 32% Al.sub.2 O.sub.3, from about 0% to about 25% CaO plus MgO, from about 0% to about 20% Y.sub.2 O.sub.3, from about 0% to about 7% ZrO.sub.2, from about 0% to about 3% alkali oxides, from about 0% to about 5% Co.sub.3 O.sub.4, from about 0% to about 5% NiO, and from about 0% to about 3% MoO.sub.3.

Abstract: High magnesium-content magnesium aluminosilicate glasses are used to form green tape compositions that are fired stepwise, i.e., first to about 500.degree. C. to remove organic materials, then to a temperature 10-30.degree. C. above the glass transition temperature for a time sufficient to nucleate the glass, and finally to a higher temperature near but below the softening temperature to complete crystallization of the glass. The resultant glass-ceramic may include substantial amounts of the forsterite crystalline phase. Multilayer ceramic printed circuit boards are made that are useful for high frequency, microwave applications. The fired high magnesium oxide content glasses have low dielectric constant and low dissipation loss factors, and they have a thermal coefficient of expansion that is compatible with metal or ceramic support substrates that impart mechanical strength to the printed circuit boards and that are thermally conductive. The boards are compatible with gallium arsenide devices.

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: The invention relates to a thin layer of UV absorbing material, and a method of making such material by grinding UV absorbing glass into fine powder which can be suspended in a liquid matrix, for example, in index matching oil, thereby producing a transparent liquid which can be used to coat any material to impart UV absorption to such material.

Abstract: The present invention relates to dielectric materials which may be used in the manufacture of, e.g., low profile heaters. Such dielectric materials comprise at least about 50% of a glass composition having about 35-50% SiO.sub.2, about 30-40% of an alkaline earth metal oxide selected from the group consisting of CaO, MgO, and SrO, about 13--22% Al.sub.2 O.sub.3, and about 0-10% B.sub.2 O.sub.3, the percentages being weight percentages based on the weight of the total glass composition. Certain dielectric compositions of the disclosure have a linear thermal expansion coefficient in the range of about 6.0 to 9.0 ppm/.degree. C.

Abstract: Glass microspheres and rear projection screens containing glass microspheres, which combine a desirable index of refraction (preferably, no greater than about 1.70) and low levels of defects (e.g., bubbles, visible haziness, frostiness, or opacity, substantially nonspherical shapes) upon formation are provided. Also provided is a coating method of placing microspheres on a film for use in a rear projection screen.