Abstract: A glass for covering electrodes, which consists, as represented by mass percentage based on the following oxides, essentially of from 35 to 55% of PbO, from 15 to 30% of B2O3, from 4 to 15% of SiO2, from 20 to 44% of B2O3+SiO2, from 0.5 to 10% of TiO2+ZrO2+La2O3+Ta2O5, from 0 to 15% of Al2O3, from 0 to 25% of BaO, from 0 to 1% of CuO and from 0 to 1% of CeO2.

Abstract: A glass for covering electrodes, which consists, as represented by mass percentage based on the following oxides, essentially of from 35 to 55% of PbO, from 15 to 30% of B2O3, from 4 to 15% of SiO2, from 20 to 44% of B2O3+SiO2, from 0.5 to 10% of TiO2+ZrO2+La2O3+Ta2O5, from 0 to 15% of Al2O3, from 0 to 25% of BaO, from 0 to 1% of CuO and from 0 to 1% of CeO2.

Abstract: A glass for covering electrodes, which consists, as represented by mass percentage based on the following oxides, essentially of: Mass percentage PbO 44 to 68% Bi2O3 0 to 18%, B2O3 19 to 23%, SiO2 1.2 to 5%, Al2O3 2 to 6%, ZnO 4 to 9%, CuO 0.1 to 0.5%, In2O3 1.1 to 2%, SnO2 0 to 1%, and CeO2 0 to 1%.

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 glass for covering electrodes, which consists, as represented by mass percentage based on the following oxides, essentially of: 1 Mass percentage PbO 44 to 68% Bi2O3 0 to 18%, B2O3 19 to 23%, SiO2 1.2 to 5%, Al2O3 2 to 6%, ZnO 4 to 9%, CuO 0.1 to 0.5%, In2O3 1.1 to 2%, SnO2 0 to 1%, and CeO2 0 to 1%.

Abstract: A low melting point glass for covering electrodes, consisting, as represented by mass percentage based on the following oxides, essentially of: Mass percentage PbO 20 to 60%, Bi2O3  0 to 30%, B2O3 20 to 55%, SiO2  0 to 10%, Al2O3  0 to 15%, MgO + CaO  0 to 35%, SrO  0 to 35%, BaO  0 to 35%, ZnO  0 to 8%.

Abstract: A low melting point glass consisting essentially of, as represented by mol % based on the following oxides: Mol % SnO   2 to 37.5, ZnO 5 to 73, P2O5 16 to 50,  Li2O 0 to 9,  Na2O 0 to 9,  K2O 0 to 9,  Al2O3 0 to 20, B2O3 0 to 30, SiO2 0 to 20, MgO 0 to 35, CaO 0 to 35, SrO 0 to 35, BaO 0 to 35, In2O3 0 to 10, WO3 0 to 10, wherein SnO+ZnO+P2O5+B2O3 is at least 76 mol %, Li2O+Na2O+K2O is from 0 to 9 mol %, MgO+CaO+SrO+BaO is from 0 to 35 mol %, and the molar ratio of SnO to ZnO is less than 1.

Abstract: A ceramic color composition which comprises from 5 to 40 wt % of a heat-resistant color pigment powder, from 50 to 94.5 wt % of a glass powder, from 0 to 25 wt % of a refractory filler, and from 0.1 to 40 wt % of at least one whisker-like refractory filler selected from the group consisting of aluminum borate whiskers, &agr;-alumina whiskers, potassium titanate whiskers, zinc oxide whiskers, Na2Ca2P2O18 whiskers, magnesium oxide whiskers, magnesium borate whiskers, basic magnesium sulfate (MgSO4.5MgO.8H2O) whiskers and titanium diboride whiskers.

Abstract: A color cathode ray tube having a panel glass and a funnel glass sealed with a composition comprising a low melting glass containing PbO as the main component, wherein the sealed portion is such that the weight reduction after being immersed in water at 90.degree. C. for 20 hours, is at most 1 mg/cm.sup.2, and the weight reduction after being immersed in a 10% nitric acid solution at 40.degree. C. for 20 minutes, is from 80 to 700 mg/cm.sup.2.

Abstract: A substrate for a plasma display panel, having electrodes and a covering material for the electrodes, provided thereon, wherein the covering material is a non-crystallizable glass having a softening point of at most 510.degree. C. and an average thermal expansion coefficient of from 70.times.10.sup.-7 to 85.times.10.sup.-7 /.degree.C. within a range of from 50 to 350.degree. C.

Abstract: A hermetic sealing composition consisting essentially of from 90 to 99.95 wt % of a crystalline low melting glass powder and from 0.05 to 10 wt % of a low expansion ceramic filler powder, and having an average thermal expansion coefficient after firing of from 80.times.10.sup.-7 to 110.times.10.sup.-7 /.degree.C. within a range of from room temperature to 300.degree. C., wherein the crystalline low melting glass consists essentially of:______________________________________ PbO 71.5 to 78.0 wt % ZnO 10.5 to 14.5 wt % B.sub.2 O.sub.3 7.0 to 10.0 wt % SiO.sub.2 1.65 to 3.0 wt % BaO 0.1 to 1.95 wt % SrO 0 to 1.5 wt % CaO 0 to 1.5 wt % BaO + SrO + CaO 0.5 to 1.95 wt %, ______________________________________and contains substantially no fluorine, and the weight ratio of ZnO/PbO is within a range of from 0.14 to 0.20.

Abstract: A colored ceramic composition comprising, as inorganic components, from 5 to 40 wt % of a colored heat resistant pigment powder, from 60 to 95 wt % of a powder of zinc-containing glass and from 0 to 10 wt % of a refractory filler powder, wherein said glass consists essentially of the following components:______________________________________ SiO.sub.2 30 to 60 wt % ZnO 8 to 60 wt % B.sub.2 O.sub.3 0 to 5 wt % Li.sub.2 O 0 to 20 wt % Na.sub.2 O 0 to 20 wt % K.sub.2 O 0 to 20 wt % Li.sub.2 O + Na.sub.2 O + K.sub.2 O 0.1 to 20 wt % MgO + CaO + SrO + BaO 0 to 20 wt % Bi.sub.2 O.sub.3 0 to 40 wt % TiO.sub.2 0 to 10 wt % F 0 to 5 wt %.

Abstract: A method for producing a magnetic disk having a surface roughness in the entire portion of its main surface in which the peak height of the surface roughness in a data zone of the magnetic disk is lower than the peak height of the surface roughness in a CSS zone of the magnetic disk, wherein forming a magnetic disk substrate having the main surface in which a surface roughness having a substantially uniform peak height is formed in the substantially entire portion of the main surface; conducting varnishing only to the data zone in the main surface of the substrate having the surface roughness to lower the peak height of the surface roughness of the data zone; and forming a ferromagnetic layer, a protective layer and a lubricant layer sequentially on a region of the main surface of the substrate, which includes the data zone and the CSS zone.

Abstract: A hermetic sealing composition consisting essentially of from 60 to 99 wt % of a bismuth type low melting glass powder and from 1 to 40 wt % of a low expansion ceramic filler powder, wherein the low melting glass has a composition consisting essentially of:______________________________________ Bi.sub.2 O.sub.3 77 to 95 wt %, MgO + ZnO 1 to 20 wt %, B.sub.2 O.sub.3 2 to 10 wt %, SiO.sub.2 0 to 1 wt % and CeO.sub.2 0 to 10 wt %.

Abstract: A ceramic color composition comprising from 5 to 34 wt % of a heat resistant color pigment powder, from 65 to 94 wt% of a bismuth type glass powder, from 0 to 10 wt % of a refractory filler powder, and from 0.1 to 20 wt % of at least one additive selected from the group consisting of borides and silicides, as inorganic components.

Abstract: A colored ceramic composition comprising, as inorganic components, from 5 to 40 wt % of a colored heat resistance pigment powder, from 60 to 95 wt % of a zinc-containing glass powder and from 0 to 10 wt % of a refractory filler powder, wherein said glass powder consists essentially of the following components:______________________________________ SiO.sub.2 27 to 40 wt % B.sub.2 O.sub.3 10 to 20 wt % ZnO 35 to 45 wt % Li.sub.2 O 0 to 5 wt % Na.sub.2 O 0 to 10 wt % K.sub.2 O 0 to 5 wt % Li.sub.2 O + Na.sub.2 O + K.sub.2 O 0 to 15 wt %.

Abstract: A ceramic color composition comprising, as inorganic components, from 5 to 35 wt % of a colored heat resistant pigment powder, from 65 to 95 wt % of a crystalizable glass powder and from 0 to 10 wt % of a refractory filler powder, wherein said glass powder consists essentially of from 10 to 24 wt % of SiO.sub.2, from 60 to 75 wt % of Bi.sub.2 O.sub.3, from 0 to 15 wt % of B.sub.2 O.sub.3, from 0 to 4 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 0 to 15 wt % of BaO and from 0 to 3 wt % of TiO.sub.2.

Abstract: A process of forming a glass sheet by coating a portion of a glass sheet with a ceramic color paste, then forming a silver paste over a portion of the ceramic color paste and then firing the sheet. The ceramic color paste is of a composition which prevents the migration of silver ions to the glass plate during the firing. Migrated silver ions causes discoloration in the glass. The ceramic color composition comprising, as inorganic components, from 40 to 95 wt % of a glass powder, from 4 to 40 wt % of a heat resistant pigment powder and from 1 to 30 wt % of a boride, a nitride, a carbide, lead sulfide or a mixture thereof.

Abstract: A process for producing a curved glass plate, which comprises coating a crystallizable ceramic color composition to a predetermined portion of a glass plate, followed by baking at a temperature of from 500.degree. to 620.degree. C. to fuse the ceramic color composition to the glass plate, then crystallizing the fused ceramic color composition at a temperature of from 600.degree. to 700.degree. C., followed by bend-shaping by a pressing apparatus in a furnace.

Abstract: A calcium phosphate type glass-ceramic which comprises from 64 to 72% by weight of phosphorus oxide in terms of P.sub.2 O.sub.5, from 13 to 20% by weight of calcium oxide in terms of CaO, from 6 to 13% by weight of strontium oxide in terms of SrO, and from 3 to 15% by weight in total of at least one member selected from the group consisting of aluminum oxide, cerium oxide and lanthanum oxide respectively in terms of Al.sub.2 O.sub.3, Ce.sub.2 O.sub.3 and La.sub.2 O.sub.3, a molar ratio of (CaO+SrO)/P.sub.2 O.sub.5 being 0.78-0.86.