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This is Double-units insulating glaze. The total thickness is 25 mm. Out-side unit is all glass laminates, 15mm-thick bullet-resistant glass, which can resist multiple shots of bullets at distance of 3 meters, the bullets weigh 4.8g with velocity of 310m/s, inside unit is 4mm-thick Tempered glass. The space between the two units is 6mm
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