Designing Bullet Resistant Protection Panel Systems: Capture More than the Imagination

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Advertorial course provided by Bullet Guard Corporation
Virginia A. Greene, AIA
Intrusion Detention Specifications
Low Class II
1/4"+
2 Ply
Low Class II
1/2"
1 Ply
Medium Class III
3/8"+
2 Ply
Medium Class III
3/8"+
2 Ply
High Class III
1/2"+
3 Ply
High Class III
1/2"+
3 Ply
High Class III
1/2"+
3 Ply

Bomb Blast Polycarbonate

Bomb blast resistant polycarbonate is available as viable explosives deterrent. Bomb blast represents the ultimate threat level as measured by the concessive blast force against fixed glazing. The test ratings are based on PSI (per square inch) x LBS (pounds) x distance explosives is from polycarbonate.

Bomb Blast Specifications
Level 1- .530"
Thickness 20psi
Approx. 100lbs. TNT @ 1001
CG500
Level 2- .780"
Thickness 28psi
Approx. 150lbs. TNT @ 49.5'
CG750
Level 3- 1.050"
Thickness 57psi
Approx. 115lbs. TNT @ 115'
BR 1000
Level 3- 1.300"
Thickness 57psi
Approx. 115lbs. TNT @ 115'
BR 125

Design efficiency is determined by many factors including sizes of window, strength of frame capture and use of multiple-pane glazing systems. These are significant factors in the performance of the window system against blasts. Ballistic capture frames are recommended to provide the combines strength of the polycarbonate and the frame material usually aluminum or steel.

Transparent Bullet Resisting Materials

GLASS AND GLASS CLAD
Glass comes in Laminated Glass, which is layers of glass stacked together and glued. Glass Clad, is glass with polycarbonate laminated in it. Laminated glass light transparency is 55% (similar to a soda bottle). Transparency of Glass Clad varies with the type of glass used.

The advantage of glass is that it is harder than plastic and cleans with ammonia based cleaner. It is about 2-1/2 times heavier than plastic and is therefore limited to manageable sizes. The use of glass limits voice ports to round stainless steel voice ports. Glass has to be framed and is limited in design capabilities.

Materials using glass are best for exterior applications. The use of glass and glass/clad as an enclosure can be very confining and institutional in appearance.

Current Glass Specifications
Level 1
Level 2
Level 3
Laminated Glass
1-3/16"
1-5/16"
1-3/4"
Glass Clad Polycarbonate
3/4"
15/16"
1-3/16"

 

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Originally published in Architectural Record.
Originally published in June 2006

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