Abstract

The present invention concerns a vacuum insulating glazing unit (10) extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z, comprising: a. a first glass pane (1) having a thickness Z1, and a second glass pane (2) having a thickness, Z2, wherein the thicknesses are measured in the direction normal to the plane, P, and wherein Z1 is greater than Z2 (Z1>Z2); b. a set of discrete spacers (3) positioned between the first and second glass panes and maintaining a distance between the first and the second glass panes; c. a hermetically bonding seal (4) sealing the distance between the first and second glass panes over a perimeter thereof; d. an internal volume, V, defined by the first and second glass panes and the set of discrete spacers and closed by the hermetically bonding seal and wherein a vacuum of pressure less than 0.1 mbar is created, characterized in that, a thickness ratio, Z1/Z2, of the thickness of the first glass pane, Z1, to the thickness of the second glass pane, Z2, is equal to or greater than 1.30 (Z1 / Z2 = 1.30), and in that the second glass pane is made of prestressed glass.

IPC Classes  ?

• E06B 3/66 - Units comprising two or more parallel glass or like panes in spaced relationship, the panes being permanently secured together, e.g. along the edges