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Laminated Glass

Laminated glass is a type of safety glass that holds together when shattered. In the event of breaking, it is held in place by an interlayer, typically of polyvinyl butyral (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 the glass from breaking up into large sharp pieces. This produces a characteristic "spider web" cracking pattern when the impact is not enough to completely pierce the glass. 

 

 

Skylight glazing and automobile windshields typically use laminated glass. In geographical areas requiring hurricane-resistant construction, laminated glass is often used in exterior storefronts, curtainwalls and windows.

The PVB or EVA  interlayer also gives the glass a much higher sound insulation rating, due to the damping effect, and also blocks 99% of transmitted UV light.

 
This produces a characteristic "spider web" cracking pattern when the impact is not enough to completely pierce the glass.
 
Automobile windshield with "spider web" cracking typical of laminated safety glass. Another car windshield with a spiderweb pattern,
 
impacted by a motorcycle taillight on the highway.Laminated glass is normally used when there is a possibility of human impact or where the glass could fall if shattered.

A typical laminated makeup would be 3 mm glass / 0.38 mm interlayer / 3 mm glass. This gives a final product that would be referred to as 6.38 laminated glass.
Multiple laminates and thicker glass increases the strength. Bulletproof glass is often made of several float glass, toughened glass and Perspex panels, and can be as thick as 100 mm.
 
A similar glass is often used in airliners on the front windows, often three sheets of 6 mm toughened glass with thick PVB / EVA between them.
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