Check out the Composite Armor Flyer at Strongwell.com.....[afro2]
This will guide you some on the UL Standard, and then let me know if you want to purchase some panels for a retrofit application.
Greetings...I am a structural engineer for a fiberglass pultruder. Our Extren flat panels (flat 4'x8' sheets of plate) have a Young's Modulus of 2.6Mpsi minimum in the direction of pultrusion, or the strong direction. You should look at the edges and see if you can see layers in the build...