What is the standard for purchasing high-grade aluminum alloy doors and windows?

First, the material needs to meet the needs of five aspects.

1, thickness: the thickness of aluminum alloy profiles varies from 0.6 mm to 3.0 mm, and the high-end aluminum alloy doors and windows profiles should be at least 1.4 mm thick.

2. Strength: the tensile strength should reach 157 Newton per square meter, and the yield strength should reach 108 Newton per square meter. When purchasing, you can bend the profile moderately by hand, and it is a good product that can be restored to its original state after letting go.

3. Smoothness: When checking the surface of aluminum alloy profile, there should be no concave or convex.

4. Glossy: For aluminum alloy doors and windows, avoid buying profiles with obvious defects such as bubbles (white spots), dusting (black spots), cracks, burrs and peeling.

5. Oxidation degree: the thickness of oxide film should reach 10 micron. When buying, you can scrape the surface of the profile to see if the oxide film on its surface can be wiped off.

Second, the product surface quality

The quality of doors and windows will directly affect the overall installation effect, so pay attention to check the quality of doors and windows from the following aspects when purchasing:

1. The decorative surfaces of doors and windows shall not be damaged obviously, and the protective film on the surfaces of doors and windows shall not be scratched.

2. There should be no obvious color difference on the color surfaces of adjacent components on doors and windows.

3. There shall be no aluminium scrap, burr, oil stain or other stains on the surface of doors and windows, and there shall be no glue overflow in the assembly process and too many pinholes exposed, which will affect the appearance.

Third, the smaller the product size deviation, the better.

Aluminum alloy doors and windows products will have a qualified size deviation range, the smallest size deviation is the best, and those beyond the range are unqualified products. Door and window drains are treated by staggered internal and external positions, which can prevent the entry of cold air and dust, and even under the condition of high wind pressure, the accumulated water can be discharged smoothly. In addition, there are two sealing strips with special structures and materials between the casement window frame and the sash for sealing, which increases the water tightness and air tightness of the doors and windows.

When consumers buy products, it is best to choose the products of regular aluminum alloy doors and windows manufacturers. At present, there are many self-employed people who process aluminum alloy doors and windows, but they don't understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce costs, there are often cases of cutting corners and shoddy products, so the hidden dangers of products are even greater.