"I only see a little clue, the thickness of bulletproof glass is generally more than 20 millimeters, if it is used ordinarily, it is completely sufficient below 25 millimeters, even if it is a bank, the general thickness is 30 millimeters, and the maximum is generally 40 millimeters. But the bulletproof glass you provided, which is forty-five millimeters thick and beautifully made, should have been imported from Germany. ”

After a pause, Xu Fang continued: "The hardness of the bearing layer is very high, the light transmittance of the transition layer is high, and the safety protection layer has some toughness, which can absorb most of the impact energy. You......