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圖片簡介: Generally the one-way bulletproof glass will be made into two layers: the outside fragile layer and the inside tough layer. When one bullet is fired from the outside, it will firstly hit the fragile layer and concurrently break one region, at this moment some kinetic energies of the bullet will be absorbed and spreaded in a larger region, so that it will be blocked while the decelerated bullet hits the tough layer once again. Bu when the bullet is fired from the inside, it will firstly hit the tough layer and pierce for its centralized energy in a small scale, the fragile layer will then shatter to outside while the tough one is flicking to outside without any intervention in the progress of the bullet.