Laminated glass consists of two or more sheets of glass permanently bonded together by a plastic or resin interlayer. Laminated glass offers superior safety. Although it will break on impact, the fragments are held by the interlayer.
The layered nature of laminated glass means that it blocks more noise and UV light than single glass. It can also be made with Low E glass and used in Insulating Glass Units for increased environmental benefits.
4.1 Benefits And Applications
Safety & Protection
When subjected to impact, the bond between the glass and interlayer adhere any broken fragments, keeping the glass intact and resisting penetration.
This important breakage characteristic significantly reduces the likelihood of serious injury, qualifying laminated glass as a Grade A safety glass in accordance with AS/NZ 2208 and other international standards. In addition, the glass will not fall out if used in sloped or overhead glazing applications providing environmental protection.
Laminated glass offers greater protection for people and property by providing an effective barrier from attack. Although the glass will break if hit with a hammer, brick or similar object, the interlayer can resist penetration, ensuring any attempt to enter a premises will be slow and noisy.
In addition, the attacked glass will tend to remain in the opening, keeping wind and rain out of the building until it can be replaced at a convenient time. The type of laminated glass required will depend on the level of security required.
PVB laminated glass products absorb the sun’s UV radiation while allowing important visible light to pass through. It therefore helps protect curtains, furnishings and carpets from fading caused by the damaging effects of short-wave ultra-violet radiation.
Laminated glass is very effective in reducing the transmission of noise through glazing. This is achieved through the sound dampening properties of the interlayer, which will vary with the type and thickness of the interlayer.
Laminated glass can have a tinted interlayer or
be made with tinted or reflective glass to reduce glare and heat gain
in a building. It can also be made with Low E glass or be processed into an IGU to reduce heat loss from the building and thus save on energy costs.
Colour and Light
Laminated glass can be made with a wide range
of coloured PVB interlayer to provide special lighting effects. These
colours can be combined with tinted and/or printed glass to provide
Refer Section 8.10 for more information.
Pictures and Images
New techniques allow PVB interlayers to be printed
with coloured pictures or images before laminating to create special
Refer Section 8.11 for more information.
Due to the controlled nature of the laminating process, façades glazed with annealed laminated glass avoid the risk of visible distortions that are sometimes created by the heat treatment processes, providing significantly sharper visual transmission and reflections.
These benefits are however, dependent on the nature of the final processed product.
Laminate glasses with a tinted interlayer do not exactly match tinted float glasses and care is required when colour matching glass types in a building.
However with laminated glass, the clear glass thickness can be increased to meet design loads without changing the tint colour, so matching can be obtained with different thicknesses of glass.