DOUBLE GLAZING FOR BUILDING WINDOW

摘要

To provide multiple glazing for a building window, which is thin in thickness and light in weight and which is capable of suppressing scattering of fragments as much as possible when broken. In multiple glazing 10 for a building window, a glass sheet 20 arranged on the indoor side has first and second main surfaces 21a, 21b, and an edge 22, and has a surface compression stress formed at the main surfaces 21 a, 21 b by chemical tempering and has a tensile stress formed inside. The glass sheet 20 has a sheet thickness of from 1.0 to 2.5 mm; the value of the surface compression stress is from 400 to 900 MPa; the value of the tensile stress is from 1 to 25 MPa; and the thickness in the sheet thickness direction of the compression stress layer at the main surfaces 21 a, 21 b is from 7 to 25 µm.