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 MIL-HDBK-1013/12
SECTION 2:
GLAZING SYSTEM OVERVIEW
2.1
Introduction.
A glazing system consists of four
components:
a)
glazing cross-section
b)
frame
c)
anchorage
d)
wall
This section examines each of these components and describes the
materials and design considerations for each.
2.2
Glazing Cross-Sections. All security glazing cross-
sections should be fixed to maximize their effectiveness.
Movable glazings can leave assets and personnel vulnerable to
bomb, ballistic, or forced entry attack.
For cross-sections containing polycarbonate,
delamination can be a concern. The major causes of delamination
are:
a) Unbalanced layup design. Balanced glass clad
polycarbonates have a low delamination rate. As the
layup becomes more unbalanced, the delamination rate
increases.
b) Manufacturer guality controls. Using manufacturers
with tight quality controls will result in fewer
rejects due to delamination.
c) Hot and humid locations. The majority of
delaminating occurs at sites with hot and humid year
round weather. Areas that are cold, with winter
snow, have few delaminations.
d) High glazing aspect ratios. Narrow cross-sections
(aspect ratios greater that 3:1), particularly
laminates, are subject to unbalanced stresses that
can reduce the life expectancy of a glazing.
There are three types of glazing cross-sections:
monolithic, laminated, and insulated. Monolithic cross-sections
consist of a single piece of glass or plastic. Laminated cross-
sections consist of two or more plies of material bonded
together. Ply material can include glass and plastics.
Insulated cross-sections consist of two or more lites separated
by an enclosed airspace.
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