Listen, just hit the security door with your finger and listen to the sound of the knock: the squeaking sound proves that the internal filling is full; the crisp sound makes the internal filling not full.
The quantity is the thickness of the steel frame of the door frame. The thickness of the door frame steel plate can be measured from the position of the keyhole of the door frame, and the thickness must exceed 2 mm.
Look, it is to see the security door inspection report issued by the quality inspection department.
Hey, just pick up the weight of the door. The overall weight of the security door produced according to the formal process will not be less than 60 kg.
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