| 摘要 |
<p>A heat-resistant tempered glass that is for windows and doors of building and housing unit, having a strength satisfying flame shielding performance, and that realizes high image quality. The tempered glass is one resulting from physical strengthening processing of a glass plate cut into given size, characterized in that there is provided an edge portion polished plane inclined against the surface of glass plate and an end face thereof, and that the edge portion polished plane has an angle of 135° to 170° against the glass plate surface, and that a break in a corner portion made by the edge portion polished plane and the glass plate surface has a length of 200 µm or less in the direction of edge line and has a maximum width of 100 µm or less in the direction perpendicular to the edge line.</p> |
