Quantcast Glossary -Cont. - 1013_120330

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Dead Load:
the weight of the glazing product itself.
Delamination:  a condition in which one or more lites of glass or
polycarbonate lose their bond with an interlayer.
a gauge to measure hardness.
See "shore hardness."
Elastomer:  an elastic, rubber-like substance such as natural or
synthetic rubber.
see "reflected overpressure" and "reflected impulse."
Fully Tempered Glass:  heat-treated glass which has a high degree
of temper (ANSI Z97.1-1984 and ASTM-C1048-92).
Glass:  an inorganic product of fusion that has cooled to a
ridged condition without crystallizing.
Glass-Clad Polycarbonate:  one or more lites of flat glass bonded
with an aliphatic urethane interlayer to one or more sheets of
polycarbonate in a pressure/temperature/vacuum laminating
process.  PVB may be used to bond glass to glass.
Glazing:  glass or other transparent material installed in or on
a building as a window.
Hardening:  the conscious use of construction materials,
techniques or designs which increase security integrity by
providing greater delay time against forced entry attack, greater
penetration resistance against ballistic attack, or greater
capability to resistance peak reflected overpressures and
impulses due to a blast attack.
Heat Strengthened Glass:  glass that has been subjected to a
thermal treatment characterized by rapid cooling to produce an
intermediate level compressively stressed surface layer.  The
surface layer is somewhat less stressed than layers found in
tempered glass (ASTM C1048-90).
Heat Treatment:  the tempering process which is used to increase
the strength of annealed glass.
Incident Impulse:  the impulse (area under the overpressure-time
curve) of the incoming blast pressure wave unimpeded by solid


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