The invention is a glass for electric lamps comprising SiO.sub.2, A1.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, BaO, MgO, CaO, ZnO, B.sub.2 O.sub.3, TiO.sub.2, SbO.sub.3, MnO.sub.2 and one or more of the following Fe.sub.2 O.sub.3, As.sub.2 O.sub.3 and CeO.sub.2, where ZnO is 3 to 7 weight %, B.sub.2 O.sub.3 is 3 to 8 weight %, TiO.sub.2 is 0 to 1.5 weight %, Al.sub.2 O.sub.3 is 0.3 to 2.5 weight %, BaO is 1 to 4.5 weight %, CaO is 2 to 4.5 weight %, MgO is 0.5 to 3.7 weight %, and the su...

The present invention relates to glass which comprises the oxides of silicon, zirconium, aluminum, lanthanum, strontium, calcium, sodium, lithium, and potassium. The content of these components in the proposed glass, in terms of percent by weight, is as follows: The glass of the present invention possesses high chemical stability in solutions containing large amounts of alkali and soda and can be used at temperatures of up to 150.degree. C.

Glass particularly suitable for use in a secondary emission electrode, after adjustment of the surface conductivity by heating in a reducing atmosphere, and having a composition in percent by weight within the range limited as follows:

Glass which after adjustment of the surface conductivity by heating in a reducing atmosphere is particularly suitable for use in a continuous channel dynode and which has a composition within the following limits in percent by weight: The invention relates to a range of glass compositions which are particularly suitable for use in a continuous channel dynode. This dynode consists of a body having two parallel end boundary faces and being provided with a plurality of channels which are either or ...

A laminated glass having a low haze ratio and an excellent infrared rays shield performance and a glass composition suitable for use in a laminated glass and easy with respect to melting and molding works, which is a glass composition comprising 65 to 74% of SiO.sub.2, 0 to 5% of B.sub.2O.sub.3, 1.9 to 2.5% of Al.sub.2O.sub.3, 1.0 to 3.0% of MgO, 5 to 10% of CaO, 0 to 10% of SrO, 0 to 10% of BaO, 0 to 5% of Li.sub.2O, 13 to 17% of Na.sub.2O, 0.5 to 5% of K.sub.2O, 0 to 0.40% of TiO.sub.2 and 0.3...

A glass substrate for use as the substrate of an information recording medium such as a magnetic disk, magneto-optical disk, DVD, or MD or of an optical communication device, and a glass composition for making such a glass substrate, contains the following glass ingredients: 45 to 75% by weight of SiO.sub.2; 1 to 20% by weight of Al.sub.2O.sub.3; 0 to 15% by weight, zero inclusive, of B.sub.2O.sub.3; SiO.sub.2+Al.sub.2O.sub.3+B.sub.2O.sub.3 accounting for 65 to 90% by weight; a total of 7 to 20%...

A glass substrate for use as the substrate of an information recording medium such as a magnetic disk, magneto-optical disk, DVD, or MD or of an optical communication device, and a glass composition for making such a glass substrate, contains the following glass ingredients: 45 to 75% by weight of SiO.sub.2; 1 to 20% by weight of Al.sub.2O.sub.3; 0 to 8% by weight, zero inclusive, of B.sub.2O.sub.3; SiO.sub.2+Al.sub.2O.sub.3+B.sub.2O.sub.3 accounting for 60 to 90% by weight; a total of 0 to 20% ...

A glass for substrate, which consists, as represented by mass percentage, essentially of: wherein MgO+CaO+SrO+BaO is at least 15%.

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.

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.