| 摘要 |
To provide a heat-absorbing glass plate having a low visible light transmittance, a solar transmittance sufficiently lower than the visible light transmittance, and a low excitation purity, and a process for its production. A heat-absorbing glass plate containing iron, tin, selenium, cobalt and sulfur, wherein
the mass ratio of divalent iron as calculated as Fe 2 O 3 to total iron as calculated as Fe 2 O 3 is at least 55%,
the ratio Tv/Te of the visible light transmittance Tv (by illuminant A, 2° visual field) as defined in JIS R3106 (1998) calculated as 4 mm thickness of the glass plate to the solar transmittance Te as defined in JIS R3106 (1998) calculated as 4 mm thickness of the glass plate, is at least 1.5,
the visible light transmittance Tv (by illuminant A, 2° visual field) is at most 65% as defined in JIS R3106 (1998) calculated as 4 mm thickness of the glass plate, and
the excitation purity Pe is at most 7% as defined in JIS Z8701 (1999) calculated as 4 mm thickness of the glass plate. |
