Recent Advances
U.S. military researchers are developing a new class of transparent armor incorporating aluminum oxynitride (Trade name: ALON) as the outside "strike plate" layer. It is much lighter and performs much better than traditional glass/polymer laminates. Aluminum oxynitride "glass" can defeat threats like the .50 caliber armor piercing rounds using material that is not prohibitively heavy. Various types of other materials which closely resemble glass are also being developed.
Read more about this topic: Bulletproof Glass
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