TRANSPARENT HEAT SHADING GLASS SHEET AND MULTIPLE-GLAZING UNIT USING THE SAME

摘要

A transparent heat shading glass sheet in which natural color tones of a landscape can be secured and a high visible light transmittance and a high solar heat shading rate can be obtained, and a multiple-glazing unit using this transparent heat shading glass sheet, which is suitable for use in low latitude areas. On a glass sheet containing iron components as coloring components, a tin oxide film to which fluorine or antimony is added suitably is formed. The iron components include 0.090 wt.% to 0.14 wt.% FeO and the total amount of iron oxide based on Fe2O3 is at least 0.31 wt.% and below 0.46 wt.%. Metal oxide films are provided between the film and the glass sheet. Thus, a transparent heat shading glass sheet can be provided, which has a visible light transmittance of at least 70 %, a solar radiation transmittance of 60 % or lower, and absolute values of the psychometric chroma coordinates a* and b* of transmitted light of 5 or less. In the multiple glazing unit using this glass sheet as a glass sheet positioned outside a room, the solar heat gain coefficient is decreased to 0.58 or lower.