There are two types of laminated glass: PVB laminated and cast resin laminated glass. PVB laminated is the more commonly used variety.

PVB laminated safety glass

Two or more sheets of glass are bonded together with one or more layers of polyvinyl butyral (PVB), a plastic interlayer in sheet form. The principal benefit of laminated glasses is their performance under impact.

The glass may fracture but any broken fragments will remain firmly bonded to the interlayer.

The interlayer also absorbs impact energy, reducing the risk of penetrating the panel. When properly glazed, even safety grade laminates will resist attack, acting as a deterrent to burglars and normally remaining in place until replacement is convenient.

Depending on the arrangement, number and thickness of glass sheets and interlayers in the construction of the laminated glass, different levels of protection are possible including against firearms and explosions.

The interlayer in laminated glass provides two additional benefits:

  • sound transmittance is reduced, particularly at the higher frequencies
  • Ultra-violet radiation (between 320 and 380 nanometres) is reduced by up to 99%.

For more information on the PVB laminated glass range from SAINT-GOBAIN GLASS see SGG STADIP/ SGG STADIP PROTECT .

Resin laminated safety glass

Resin laminated glass is manufactured by pouring liquid resin into the cavity between two sheets of glass which are held together until the resin cures.

Also sometimes referred to as cast-in-place laminated glass, this method is ideal for laminating glass having a heavily textured or patterned surface.

It is also possible to add a wide variety of colours to the resin for decorative effect. Not all resin laminates have safety performance. They are principally used for decorative and acoustic purposes, where safety performance is normally of secondary importance.