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SECURITY
GLAZING
Security glazing can be broadly defined as products
and systems designed to protect people and property against
criminal actions. Security glazing in the case of criminal
actions should be considered as just one component in the
overall security system. Factors affecting which level
of security glazing to choose include security and police
response time, protection of people, protection of goods
and the availability of other forms of security such as
electronic surveillance.
 Standard
float glass - provides little protection or resistance
to forced entry by intruder or the natural elements;
Toughened
glass - offers 5 times the strength of standard float
glass, but upon impact will shatter into small fragments
leaving the opening accessible;
Laminated
glass - offers resistance to a greater degree by virtue
of its tough PVB interlayer. Depending on the velocity and
strength of the impact, laminated glass will tend to stay
intact in the opening. Special laminated glass is available
using a 1.52mm interlayer to make up 6.52mm and 11.52mm laminated
glass. These products are ideal for smash and grab attempts
in high traffic areas and provide longer resistance to forced
entry at home.
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Intruder
Resistant Glazing System
As covered by AS3555 Building elements - Testing and rating for intruder
resistance 1988, specific types of forced entry resistant glazing systems
have been developed to withstand physical attack with common hand tools,
axes, sledges and power tools etc. These products are supplied as a complete
frame and glass unit. The standard AS3555 evaluates the maximum size opening
allowed after a number of minutes and by a level of attack. This standard
does not cover bullet resistant attack, but can be manufactured to do so.
Bullet Resistant Glazing System
These systems consist of a complete frame and glass bullet resistant unit.
A multilaminated glass which can include polycarbonate and polymer sheets
with PVB interlayers is laminated together to various thicknesses according
to the level of protection required as per the seven classification levels
in AS2343 Bullet resistant panels and elements 1997 (refer Table 1). In
common applications thicknesses vary from 19 - 65mm. Bullet resistant glazing
systems can also be manufactured to meet AS3555 Building elements - Testing
and rating for intruder resistance 1988.
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TABLE
1: BULLET RESISTANCE (AS2343 1997)
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| Classification |
Calibre |
Ammunition |
Measured
velocity within 2.5 metres of target (metres
per second) |
Minimum
range (metres) |
Number
of strikes |
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| G0 |
9mm
Parrabellum |
Mk22
7.4 gram bullet |
405
+/– 15 |
3 |
3 |
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| G1 |
357
Magnum |
10.2
gram semi jacket soft point |
450
+/– 15 |
3 |
3 |
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| G2 |
.44
Magnum |
15.6
gram semi jacket soft point |
480
+/– 15 |
3 |
3 |
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| R1 |
5.56mm |
M193
5.56mm 3.6 gram FMJ |
980
+/– 15 |
10 |
3 |
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| R2 |
7.62mm |
NATO
9.3 gram FMJ |
850
+/– 15 |
10 |
3 |
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| S0 |
12
Gauge (Full choke) |
70mm
case 32 gram SG shot |
400
+/– 20 |
3 |
2 |
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| S1 |
12
Gauge (Full choke) |
70mm
case 28.5 gram solid slug |
450
+/– 20 |
3 |
2 |
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Note 1 - Shot centres 100mm apart, forming a
square or equilateral triangle, centred on the target
panel.
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Note 2 - Special class shall be specified by
the manufacturer and allows for oblique shots or elements
that are not 420mm square etc.
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| A
range of specialty glass products is available to suit
most specialist needs. Talk to our sales or technical
department for more information on any of the following
products. |
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