1. Thickness:
Aluminum sliding doors are divided into 70 and 90 types according to thickness, and 70 sliding doors in indoor rooms can be used. The numbers here represent the number of millimeters in the thickness of the frame.
Aluminum alloy sliding window according to thickness can be divided into 55, 60, 70 and 90 four series. The selection of sliding Windows needs to be determined according to the size of the window hole and the local wind pressure value. The aluminum alloy sliding window used to close the balcony should not be less than 70 series.
2. Strength:
The tensile strength of aluminum alloy doors and windows must reach 157N per square meter of millimeter and above, and the yield strength should reach 108N per square millimeter. When buying doors and Windows, you can moderately bend the profile by hand, and it should be able to return to its original state after letting go.
3. Chroma:
This can be distinguished by the naked eye, observe whether the color of a whole aluminum alloy profile is consistent as a whole, if there is a significant color difference, it is not recommended to buy.
4. Flatness:
Check the surface of the aluminum alloy profile, there should be no depression or bulge.
5. Gloss:
Aluminum alloy doors and windows to avoid the selection of surfaces with open bubbles (white spots) and ash (black spots), as well as cracks, burrs, peeling and other obvious defects of profiles.
6. Oxidation Degree:
the oxide film thickness should reach 10 microns. When purchasing, you can lightly scratch the surface of the profile to see whether the oxide film on the surface can be wiped off.
