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This is Double-units insulating glaze. The total thickness is 27 mm. Out-side unit is all glass laminates, 17mm-thick bullet-resistant glass, which can resist multiple shots of bullets at distance of 5 meters, the bullets weigh 5.6g with velocity of 500m/s,， equivalent to NIJ3A or UL6. Inside unit is 4mm-thick tempered glass. The space between the two units is 6mm
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