| abstract |
(57) [Summary] [PROBLEMS] Ultraviolet light having a bluish green or deep green color tone close to neutral color, having low to medium visible light transmittance, low total sunlight energy transmittance and low ultraviolet transmittance. Provide an infrared absorbing low transmission glass. SOLUTION: Expressed in terms of% by weight, 65 to 80% of Si O 2 , 0-5% Al 2 O 3 , 0-10% MgO, 5 15% of CaO (provided that the total amount of MgO and CaO 5-15%), 10 to 18% of Na 2 O, 0 to 5% of K 2 O (however, the total amount of Na 2 O and K 2 O is 10-20 %), And a base glass composition comprising 0 to 5% B 2 O 3, as coloring components, the total iron oxide in terms of 1.2 to 2.2% of Fe 2 O 3 (T-Fe 2 O 3 ), 0.001 An ultraviolet-ray-absorbing low-transmission glass made of 0.03% CoO, 0-0.0008% Se, and 0-0.2% NiO. |