| abstract |
(57) Abstract: The visible light transmittance is low, the solar radiation transmittance and the ultraviolet ray transmittance are significantly low, and it can be melted by an ordinary type of melting tank and can be manufactured by the float method. SOLUTION: SiO 2 : 65-75, Al 2 by weight%. O 3: 0.1~5.0, Na 2 O + K 2 O: 10~1 8, CaO: 5~15, MgO: 1~6, SO 3: 0. Fe 2 to 100 parts of the mother component consisting of 05 to 1.0 0.8 to 1.4 parts, FeO:: total iron expressed in O 3 0.2 1 part or less, TiO 2 : 0.05 to 1.0 part, Se: 0. 0005-0.015 part, CoO: 0.02-0.05 Part of a dark gray glass. |