Plate: a group of glazing plies which have the same mechanical
properties. Ply thickness may vary and interlayers are ignored.
Plate Glass: flat glass formed by a rolling process, ground and
polished on both sides, with surfaces essentially plane and
Positive Phase Duration: the interval during the blast event in
which the pressure at a point is higher than the ambient
PVB: polyvinyl butyral interlayer material used to bond glass to
Reflected Impulse: the impulse measured at the surface of a
rigid object as a result of normal incidence with a blast
Reflected Overpressure: the overpressure measured at the surface
of a rigid object as a result of normal incidence with a blast
pressure wave. The reflected overpressure is often referred to
as face-on overpressure.
Scratch-Resistant Coating: coating applied to glazing surfaces
to reduce the effects of frictive contact.
compound used to fill and seal a joint or opening.
see "incident overpressure" and "incident impulse."
Shore Hardness: measure of firmness of a compound by means of a
Durometer Hardness Gauge.
Stop, Removable: the removable molding or structural element of
the glazing channel that retains the lite or panel in place.
Stop, Stationary: the lip of a glazing channel or rabbet which
is a permanent structural element of the frame and retains the
glazing within it.
Surfaces: surfaces of a glazing laminate are counted from the
exterior (threat) face to the interior (protected) face.
Symmetrical: a term used to describe a laminate comprised of
glass, polycarbonate, and interlayer constructed so that all