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Tempered or Safety Glass.
Safety glass, known as tempered glass, is mainly
produced for automotive use due to the fact that the process
of elaboration is highly expensive. Also, it has to be custom
made to meet specific measurements since it cannot be reshaped
or altered once it is finished. This type of glass is five
times more resistant than common glass and has the specific
property that, when undergoing breakage, it does not shatter
into thousands of sharp fragments but in small harmless pieces.
Optical glass formula does not require to be modified for
the manufacturing of safety glass since the difference totally
depends on the process of elaboration, which consists in placing
a sheet of polyvinyl butiral (PVB) between two pieces of glass.
Next, the pieces of glass with the plastic film in between
go into the kiln to be pressed and are gradually heated at
a 620ºC temperature to later undergo a sudden air cooling.
In such a way, the surface glass is compressed while tense
in the center. In the inside section of the glass, where the
tensor force is increased by the template process, the strength
of the material is almost without limits since it is practically
free of imperfection. 
Different types
of glass.
 Lime
Glass
Borosilicate
Glass
Optical
Glass
Tempered
or Safety Glass
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