DARK GREENISH GRAY LOW-TRANSMISSIVE GLASS COMPOSITION

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PROBLEM TO BE SOLVED : To provide a dark greenish gray low-transmissive glass composition which satisfies sight line blocking performance, has low solar energy transmittance (Te) and ultraviolet ray transmittance (Tuv) and reduces a cooling load by transportation means, a building or the like, protects an interior material and a person from ultraviolet rays, and has a color space coordinate of a transparent color that reduces asthenopia and provides psychological stable feeling. SOLUTION : There are provided a dark greenish gray low-transmissive glass composition which contains 1.2-2 pts.wt. of Fe2O3, 0.02-0.04 pts.wt. of CoO, 0.002-0.0035 pts.wt. of Se and 0.01-0.04 pts.wt. of Cr2O3 with respect to 100 pts.wt. of a base glass composition, as coloring components, where a weight ratio ([CoO+Cr2O3]/Se) of (CoO+Cr2O3) to Se is 13-25, and a weight ratio (CoO/Cr2O3) of CoO to Cr2O3 is 0.9-1.8; and the dark greenish low-transmissive glass composition which further contains an oxide of a rare earth element selected from a lanthanide element. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT