1. One Way Bullet Proof Glass Engr45 Materials Instructor: Younes Ataiiyan December 1, 2004 By: Chris Rogers Bryan Clifton Nick Petrucci

2. The Concept One-way bulletproof glass Advances in bulletproof glass have lead to the invention of one-way bulletproof glass, such as used in some bank armored cars. This glass will resist incoming small arms fire striking the outside of the glass, but will allow those on the other side of the glass, such as guards firing from inside the armored car, to fire through the glass at the exterior threat.armored cars One-way bulletproof glass is usually made up of two layers, a brittle layer on the outside and a flexible one on the inside. When a bullet is fired from the outside it hits the brittle layer first, shattering an area of it. This shattering absorbs some of the bullet's kinetic energy, and spreads it on a larger area. When the slowed bullet hits the flexible layer, it is stopped. However, when a bullet is fired from the inside, it hits the flexible layer first. The bullet penetrates the flexible layer because its energy is focused on a smaller area, the brittle layer then shatters outward due to the flexing of the inner layer and doesn't hinder the bullet's progress.kinetic energy

3. Testing Multiple Shot Integrity Spall Quantity Exiting Velocity Resin Acrylic Plastic Radius of Dispersion Energy Weight Different Bullet/Jackets

4. http://www.firstdefense.com/html/default_faqs.htm

5. Inside surface (opposite threat side) 9mm 124 FMJ and.357 Magnum JSP No Spall or penetration of the 9mm rounds http://www.firstdefense.com/html/default_faqs.htm

7. http://www.labock.com/english/bpq_oneway.htm

8. BBC Presents: http://www.labock.com/english/bpq_oneway.htm

9. Original Bullet Proof Glass Bullet proof glass in general Typical composite glazing cross-section Glass to polycarbonate OmniLite OmniArmor Spall Ballistic Standards

10. Bulletproof glass is usually transparent material, such as polycarbonate thermoplastic (i.e.Lexan but also called Tuffak and Cyrolon), that provides the appearance and light-transmitting behavior of standard glass but offers varying degrees of protection from small arms fire.transparent polycarbonatethermoplasticLexan TuffakCyrolonglasssmall arms Bulletproof glass usually consists of a polycarbonate layer sandwiched between layers of regular glass. A bullet pierces the exterior glass layer with ease, but the strong polycarbonate layer stops the bullets motion before it can pierce the inner layer of glass. Bulletproof glass is usually 7-75mm thick.

11. Level IV Glass http://www.firstdefense.com/html/default_faqs.htm

12. www.lascointl.com/ doors/main.htm

13. http://www.firstdefense.com/html/default_faqs.htm

17. http://www.labock.com/english/bpq_oneway.htm

18. Applications USES & APPLICATIONS Armored Vehicles Prison security doors and guard gates/posts Riot shields, Clip boards and Helmet visors/shields Residential homes Banks, bank doors and teller glass Aircraft, helicopters, water craft VIP personal protection vehicles Airport security & parking booths Transit booths Government buildings, Embassies and lobbies Malls, shops, stores/bomb blasts Corporate offices and Executive offices Military bases and guard points Courthouses Police stations Offset Baffle Design with ADA Station

19. http://www.firstdefense.com/html/default_faqs.htm

20. History Channel http://www.labock.com/english/bpq_oneway.htm

21. One Way Test http://www.labock.com/english/bpq_oneway.htm