First, the seller is required to present the “Testing Qualification Certificate†of the relevant department to check whether it meets the technical requirements of the national mandatory standard GB17565-1998.
Second, remove the cat's eye, doorbell box or lock handle to check the internal structure of the door. There should be several reinforcing bars in the door to connect the front and rear panels of the door together. It is preferable to have a material such as asbestos which has fireproof, heat preservation and sound insulation functions as a filler.
Third, check whether the lock has adopted the anti-theft special lock that has passed the inspection by the public security department, and whether there is a strengthened steel plate for protection at the lock installation.
Fourth, check the process quality of the product, whether there are welding defects, whether the cooperation between the door leaf and the door frame is dense.
Fifth, the weight of the security door is not less than 40 kg.
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