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| major glass classifications
Annealed glass
Annealed glass is flat glass in its natural state.
It can be cut, beveled, etched, carved, slumped and fabricated
in various other ways.
Tempered glass
Annealed glass can be strengthened through a process called
tempering, which helps the glass withstand the shock of severe
blows. It is required by federal building codes for many glass
applications where there is a high risk of broken glass causing
injury. This may include doors, windows, store counters and
tabletops.
Laminated (safety) glass
Annealed glass may also be made safer by laminating two pieces
of glass together. This is typical for glass that will be
hanging overhead (i.e. skylights and ceiling panels).
Insulated glass
An insulated glass unit consists of two or three panes of
glass separated by an air space for insulation and sealed
around the edges with sealants. The unit acts as an insulator
to protect window areas from excessive heat loss in winter
and heat gain in summer. Insulated glass with two panes is
also referred to as "dual glazed". Etched, carved
and slumped glass are often insulated to protect the art surface.
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