Safety glass panes composed of two or more glasses, closely connected to one another by the interposition of one or more polyvinyl butyral foils (PVB or EVA).

The perfect glass butyral adhesion is obtained by a heat treatment and pressure. In the case of a break, in a conventional installation, the glass fragments remain adherent to the butyral and, as a whole within the frame, thereby ensuring safety for persons which are standing in front of the glass.