It Is the type of safety glass that holds together when shattered , in the event of braking it's held in place by an interlayer , typically of polyvinyl ( PVB) Or ethylene-vinyl acetate (EVA), between its two or more layers of glass . The interlayer keeps the layers of glass bonded even when broken, and its high strength prevents glass from breaking up into large sharp pieces. This produces a characteristic ``Spider Web`` Creaking pattern when the impact is not enough to completely pierce the glass . Laminated glass is normally used when there is possibility of human impact or where the glass could fall if shattered and also for architectural applications , skylight glazing and auto mobile windshields typically use laminated glass . in geographical areas requiring hurricane- resistant construction , laminated glass often used in exterior storefronts , curtain walls windows Laminated glass is also used to increase the sound insulation rating of window , where it significantly improves sound attenuation compared to unlamented glass panes of the same thickness Barrak Glass Factory have a state of the arts automated line with auto clave for glass lamination