Sounds bat shit crazy I know. But I live next to a rail depo. During WWII a small village next to the tracks not real far from where I am was wiped off the map when a train loaded with ordnance exploded. Everyone in the village died, no broken glass needed. I know they don't move ordnance like back in the WWII days but they move haz literally by the train load. In modern buildings hit by terrorizors most of the injurys and deaths were caused by broken glass if the building didn't fall down on them. I don't think I will be attacked by terrorists, more like a victim of other peoples stupidity, since there is an endless supply of stupid people and a lot of haz coming through here eventually stupidity and haz will meet, only a matter of time. A shipping container full of fireworks or a several thousand gallon propane car could easily blow in windows but not flatten houses from a half mile away. Then today at harbor freight I was buying a fiberglass welding blanket and thought of this. The fiber glass blanket is thick and heavy and may be really good at stopping knife like glass shrapnel. I'm think test it with compressed air, glass bottles and a bb gun if just compressed air isn't enough. I have seen the actual kevlar blast curtains and they are expensive, over 1000 per window, but you get what you pay for I think they are rated to stop something like plate glass shattered from a near by car bomb attack against a building. I don't need that much.