Abstract: A fluorine-free glass composition is disclosed especially adapted for forming the faceplate of a cathode ray tube such as a television tube. The glass is silica based and includes a fluorine-free flux and an X-ray absorber which may comprise lead oxide, barium oxide, strontium oxide, and mixtures thereof. Optionally, the glass may contain still other oxides to impart desired physical properties. The absence of fluorine avoids the usual problems of that ingredient in melting and processing the glass. In addition, the resultant glass as a faceplate provides improved protection to a viewer of a cathode ray tube by excellent absorption of X-rays.

Abstract: Alkali-resistant glass fibres for use as reinforcement in cementitious products are formed from a composition comprising, in weight percentages:______________________________________ SiO.sub.2 55 to 75% R.sub.2 O 11 to 23% ZrO.sub.2 6 to 22% Cr.sub.2 O.sub.3 0.1 to 1% Al.sub.2 O.sub.3 0.1 to 7% Rare earth oxides + TiO.sub.2 0.5 to 16% ______________________________________where R.sub.2 O is any one or more of Na.sub.2 O, K.sub.2 O or Li.sub.2 O, the content of TiO.sub.2 does not exceed 10%, and the total of the components recited above amounts to at least 88% by weight of the glass, the glass having been melted under non-oxidizing conditions such that all or a substantial proportion of the chromium in the glass is in the trivalent state.Cementitious products incorporating such fibres, e.g. in a proportion of 3 to 6 weight %, can be made using a Magnani-type asbestos cement machine or by a "spray-up" method.

Abstract: Soda-lime glass contains by weight the following glass forming oxides:______________________________________ SiO.sub.2 60 to 75% Na.sub.2 O 10 to 20% CaO 0 to 16% K.sub.2 O 0 to 10% MgO 0 to 10% Al.sub.2 O.sub.3 0 to 5% BaO 0 to 2% BaO + CaO + MgO 10 to 20% K.sub.2 O + Na.sub.2 O 10 to 20% ______________________________________In order to produce a tinted glass having favorable properties as regards its cost, color and freedom from haze, the following coloring agents (proportions by weight) are incorporated in the glass: ______________________________________ Fe.sub.2 O.sub.3 0.3 to 0.5% Cr.sub.2 O.sub.3 0.0075 to 0.0230% Se 0.0005 to 0.0019% Co 0.0040 to 0.0070% Ni 0.0050 to 0.

Abstract: Glass compositions which are suitable for making face-plates of cathode-ray tubes used for displaying television pictures, particularly for displaying color television pictures. A problem in formulating such glasses is to obtain glasses which can be worked satisfactorily and which do not discolor significantly as a result of electron bombardment and X-ray irradiation. The glass compositions consist of the following constituents in the following quantities (expressed in % by weight):______________________________________ SiO.sub.2 57-65 ZrO.sub.2 1-4 Al.sub.2 O.sub.3 0-4 SrO 6-14 Na.sub.2 O 5.5-8.0 PbO 0-1 K.sub.2 O 7.5-10.0 Sb.sub.2 O.sub.3 + As.sub.2 O.sub.3 0-2 MgO 0-4 TiO.sub.2 0.2-2.0 CaO 0-4 CeO.sub.2 0.05-1.0 ______________________________________wherein wt. % Na.sub.2 O/(wt. % Na.sub.2 O+wt. % K.sub.2 O)=0.40-0.47 and wt. % BaO+2 wt. % SrO+2 wt. % ZrO.sub.2 +3 wt. % PbO>32.

Abstract: There is disclosed a borosilicate, opal glass article composed of a phase-separated, opacified interior portion completely encased within, and integral with, a transparent, single-phase glass, surface skin. The phase-separated portion contains borate-rich and silicate-rich phases so different in refractive index that light is scattered, and the glass may contain a titania-coupled colorant. The article may be produced by molding a glass charge while simultaneously extracting heat from a surface layer on the molded article to maintain such surface layer as a single-phase glass.

Abstract: Dielectric composition, screen printing paste having such a composition and products obtained.The invention describes a dielectric composition which may be used in particular as an insulating screen-printing paste, which is compatible with a copper-containing conductive screen-printed layer, the paste containing, dispersed in an organic vehicle, a mixture of ceramic phases, consisting essentially of zinc oxide and cobalt oxide, and a vitreous phase containing at least a glass which can be devitrified by dissolving the zinc oxide.

Abstract: Olive-green colored reduced glass compositions are disclosed in which the glass is a soda-lime-silicate glass having Fe.sub.2 O.sub.3, S.sup.-2 and Cr.sub.2 O.sub.3 present in the following approximate ranges in % by weight:______________________________________ Fe.sub.2 O.sub.3 0.1-0.4 S.sup.-2 0.01-0.04 Cr.sub.2 O.sub.3 0.02-0.2 ______________________________________The glass is especially adapted for making beer bottles that are pleasing to the eye and are light protective without the use of cobalt.