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This is Double-units insulating glaze. The total thickness is 25 mm. Out-side unit is 2-layers glass laminates, 13mm-thick burglar-resistant glass, which can resist impact of a steel ball falling down from 18 ft high. The steel ball weighs 1.08kg. After impact, the glass has no breakage. Inside unit is 4mm-thick tempered glass. The space between the two units is 9mm
In case of breaking, the glass still keep integrity , which regular PVB laminates can not keep.
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