Thursday, April 29, 2010

Bullet Resistant- Blast Resistant " Window Film".

Bullet Resistant " Window Film". We are just amazed at the number of Window Film companies that advertise that their thin films are "Bullet Resistant" and or can offer protection from large Bomb Blasts, such as what took place in Oklahoma City a few years back. The truth is, it is impossible for any type of "Window Film" to offer real Ballistic Protection at all. Window film resists forced entry and prolonged attack from hammers, hatchets, baseball bats, sledge hammers pick ax, etc. Window Film works very well for this narrow application. We have to wonder who they can sleep at night after making ridiculous claims.

Bulletproof Glass is a colloquial term for glass that is particularly resistant to being penetrated when struck by bullets. However there is no such thing as "BulletProof". The correct term is "Bullet Resistant". True Bullet Resistant Glass is made by laminating multiple layers of glass bonded together with high adhesion bonding interlayers of polyvinyl butyral, polyurethane or ethylene-vinyl acetate. This process is done under heat and pressure in an autoclave.

Bullet Resistant Glass is then tested to specific ballistic threats as set by the National Institute of Justice [ N.I.J.] and Underwriters Laboratories [ U.L.] threat levels. And are independently tested by a certified ballistic testing lab. The most recognized is H.P. White Laboratories Inc., or University of Dayton Research Institute. We have never seen any Window Film Company produce the required Ballistic Test Reports, which is the norm for all Bullet Resistant Glass Manufacturers. They proclaim to have done numerous "BackYard" tests. Some of these so called testers have made the claim the their films slow down the projectile? what....!! your still dead.........!

Real Bullet Resistant Glass can offer protection from small caliber handguns such as .22, 9mm, .44 magnum up to a .50 caliber armor piercing rifle rounds . The thickness of Bullet Resistant Glass can be from .825" thick to over 5" thick and weigh anywhere from 8.89 lbs per sq. ft. to over 50 lbs per sq. ft. False claims by Window Film manufacturers can get people killed. Check with any Bullet Resistant Glass Manufacturer to independently verify this statement.

With regards to "Blast Mitigation" this is a highly specialized area of protection. U.S. Military and Government Contractors such as Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Pine Bluff Military Arsenal, U.S. Army Aviation & Missile Command, Redstone Arsenal, and Ballelle Memorial Institute are working to design protective systems to counter such threats. Window Film is not a proper solution for such a massive threat.

One company called "Glass Strengthening Systems" has made an absolutely ridiculous claim that they did a "Private Test" using 1400 pounds of explosives, and that their "Film" stopped any penetration at 184 feet. I wonder if they had a failure at 185 feet. First, one must wonder how in the world Glass Strengthening Systems could legally obtain 1400 pounds of explosives, let alone detonate them with out proper sanctioning from ATF. Why was this done as a "Private" un sanctioned test. Professionally speaking any "REAL" tests of this manor would be carried out under very strict protocol, under supervision of the U.S. Government, and independently tested by a certified ballistic testing lab. Where is the test data, and certification ?


  1. I think that it would be really cool to have bullet proof windows on your car and home. It would definitely make me feel safer. Plus, if my son hit a baseball at the window, it would not shatter. It would also keep the robbers out. I just got new windows a few months ago, but I think that it would be fun to look into getting bullet proof windows if one of them breaks. Thanks for the great article.

  2. Thank you for this post. We are putting in some new windows in our basement, and we need some that are weather proof. We live in Wyoming and the weather frequently breaks windows and causes floods. I'm glad I came across this information before going window shopping. Thanks!