bulletproof glass

Bulletproof glass



Generally there are two main types of armoured cars; The first type includes fully armoured vehicles with run-flat tyres, bulletproof plates and glass. The second type represents cars equipped with armoured and non-armoured parts as well. No matter the occasion or budget, you should choose the first type always. Let's go quickly through reasons why standalone bulletproof glass doesn't bring adequate safety to the passenger. First, ordinary car door is very easy target and there is no way how to hide from shooting. Second, assassin might aim on engine, tyres, driver, fuel tank, etc. Third, glass won't even protect you from abduction.

Protection levels


According to protection standards which applies to both, armoured plates and bulletproof glass, there is a huge difference between those which fit B4 and B7 protection criteria. Basically more robust glass means more safety. This fact was known in 20's (years 1920-1929) when Al Capone had 8 cylinder car with armoured plates reaching 3cm in width. 2 years later he secured Cadillac 452 with 120 kW output and 4cm armouring. However, police had armour-piercing projectiles which were capable to break through the armour anyway. Since technology moved forward by unbelievable steps, actual glass and armouring is far beyond old armouring techniques. But it doesn't mean that current armouring protects man from everything. As above-mentioned, glass can be divided into 4 protection levels using the Central European Normalization and higher the number, higher security it brings. Additionally, differences in prices aren't very noticeable.

Technology


Different manufacturers make different variations of bullet-resistant glass, but it is basically made by layering a polycarbonate material between pieces of ordinary glass in a process called lamination. This process creates a glass-like material that is thicker than normal glass. Polycarbonate is a tough transparent plastic -- often known by the brand name Lexan, Tuffak or Cyrolon. Bullet-resistant glass is between 7 millimeters and 75 millimeters in thickness. A bullet fired at a sheet of bullet-resistant glass will pierce the outside layer of the glass, but the layered polycarbonate-glass material is able to absorb the bullet's energy and stop it before it exits the final layer.

"How does "bulletproof" glass work?". September 26, 2000
http://science.howstuffworks.com/question476.htm (May 30, 2007)


Replacement and buying tips


Before you buy any glass, make sure you will be able to replace it fast in case of accident. Such accident might be attempt on your life but it can be ordinary car accident as well. In this case you should be able to get new glass as soon as possible. Wait state shouldn't exceed 1 week, but optimal time between order and delivery is 24 hours. Large companies have service parts available in their warehouses as well.

There is another question regarding �previous history� of each glass. Used armoured glass or even any used armoured plate is safe and such equipment is available from unmounted cars primarily which means they are OK. On the other hand there is a difference between old and new armouring standards, so that you should insist on resultant quality and equal protection level.

Pictures



Bulletproof glass, production line Bulletproof glass after shooting

Mounting a bulletproof glass

Bulletproof glass, Mercedes-Benz G Guard


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