It is a safety glass that consists of two or more single glazing joined by a layer of plastic material of polyvinyl butyral or EVA. These materials were chosen due to their outstanding qualities of resistance, adherence and elasticity. The bonding process between the butyral and the panes of glass takes place under thermal and pressure treatment. The obtained product has the same transparency as any other glass with the same thickness.
In case of breakage, the fragments of glass are held in place by the butyral and kept together inside the frame, which promotes safety and prevents entrance through the glass.
Different units with different characteristics can be obtained if nature, number and thickness of its components are changed. The resistance can vary in order to provide physical safety or even ballistic protection.
Laminated glass can have translucent, light diffusing or coloured interlayers.