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: The ultraviolet/infrared absorbent low transmittance glass has an almost neutral greenish color, middle visible light transmittance, low total solar energy transmittance, and low ultraviolet transmittance, and is suitable for a window of a vehicle or a building and capable of preventing degradation and discoloration of interior materials and protecting privacy. The glass consists of base glass including: 65 to 80 wt. % SiO.sub.2 ; 0 to 5 wt. % Al.sub.2 O.sub.3 ; 0 to 10 wt. % MgO; 5 to 15 wt. % CaO wherein a total amount of MgO and CaO is between sand 15 wt. %; 10 to 20 wt. % Na.sub.2 O; 0 to 5 wt. % K.sub.2 O wherein a total amount of Na.sub.2 O and K.sub.2 O is between 10 to 20 wt. %; and 0 to 5 wt. % B.sub.2 O.sub.3, and colorants including: 0.7 to 0.95 wt. % total iron oxide (T-Fe.sub.2 O.sub.3) expressed as Fe.sub.2 O.sub.3 ; 1.1 to 2.3% TiO.sub.2, 0 to 2.0% CeO.sub.2, 0.013 to 0.025 wt. % CoO; 0 to 0.0008% Se; and 0.01 to 0.07% NiO.

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: 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: Ultraviolet- and infrared-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 in the first embodiment, as coloring components, 0.25 to 0.45% by weight, in terms of Fe.sub.2 O.sub.3, of total iron oxide (T-Fe.sub.2 O.sub.3) having an FeO/T-Fe.sub.2 O.sub.3 ratio, in terms of Fe.sub.2 O.sub.3, of 15.5 to 25.0%, 0.8 to 2.0% by weight of CeO.sub.2, 0 to 1.0% by weight of TiO.sub.2, 0 to 0.005% by weight of CoO, and 0.0005 to 0.005% by weight of Se; or in the second embodiment, as coloring components, 0.25 to 0.5% by weight, in terms of Fe.sub.2 O.sub.3, of total iron oxide (T-Fe.sub.2 O.sub.3) having an FeO/T-Fe.sub.2 O.sub.3 ratio, in terms of Fe.sub.2 O.sub.3, of 5.

Abstract: A vertical glass melting furnace of the type having an inlet for raw materials at the top thereof, an outlet for molten glass at the bottom thereof, and a tabular electric resistance heating element for melting which is immersed at some level in molten glass, has at least one opening, and covers almost entirely the cross-section of the furnace at that level, the vertical glass melting furnace comprising a stirrer which extends from above the furnace and passes through the batch layer and the tabular heating element so that the stirrer brings about forced circulation for homogenization of the molten glass which has passed through the tabular heating element and stays in the region below the tabular heating element.

Abstract: A vertical glass melting furnace provided with a material entrance at the uppermost portion and a molten glass exit provided at the lowermost portion. A resistance heating element 6 is provided over the substantially entire part of the horizontal section of the furnace at at least one level which is immersed in the molten glass.

Abstract: A transparent glass-ceramic article of a unitary structure composed of an interior portion and an exterior portion, wherein the interior portion containing a crystalline phase comprises(a) 55 to 75% by weight of SiO.sub.2,(b) 15 to 30% by weight Al.sub.2 O.sub.3,(c) 2 to 6% by weight of Li.sub.2 O(d) 1 to 5% by weight of Na.sub.2 O, and(e) 2 to 9% by weight of TiO.sub.2 +ZrO.sub.2 P.sub.2 O.sub.5,the total amount of the components (a) to (e) being 95 to 100 by weight, and wherein the exterior portion has the same glass composition as the interior portion but at least a part of Na.sup.+ in the exterior portion is exchanged with K.sup.+.