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1. Recognition of signs
Manufacturers with formal or production licenses shall indicate the product logo on the obvious parts of their aluminum alloy products, including: manufacturer name or trademark, product name, product model or mark, manufacturing date or serial number. There should be obvious words and signs of "moisture proof", "handle with care" and "upward" on the packing box.
2. Surface quality
(1)There should be no obvious damage on the decorative surface of doors and windows, which means that the protective film on the surface of doors and windows should not have scratches.
(2)The colored surfaces of adjacent components on doors and windows should not have obvious color differences.
(3)There should be no aluminum chips, burrs, oil spots or other stains on the surface of doors and windows, and there should be no spilled adhesive at the assembly joints.
The size deviation of aluminum alloy door and window frame is as small as possible.
4.Aluminum alloy door and window components
The aluminum alloy door and window components should be connected firmly, and corrosion-resistant filling materials should be used to seal and waterproof the connection part.