In general, identification of the merits of aluminum doors and windows, in the material selected materials are mainly six areas can refer to:
A thickness
Aluminum sliding doors 70 series, 90 series are two, inside the home of the aluminum sliding doors with 70 series can be. Series number indicates the number of millimeters thickness door frame structure size. Aluminum window has 55 series, 60 series, 70 series, 90 series four. Series selection should be based on the size of the window opening and the local wind pressure value may be.(5052 aluminum)
Second, the intensity
Tensile strength should reach 157 Newton per square millimeter, the yield strength to reach 108 newtons per square millimeter. When you purchase, it can be hand moderately curved profiles, let go after the state should be able to recover.(aluminum alloy 5052)
Third, chroma
With an aluminum profile should be the same color as the color clear, that should not be optional.
Fourth, the flatness
Check the aluminum alloy surface, there should be no dents or bulges.
Five. gloss
Aluminum windows and doors opening to avoid the purchase of surface bubbles (white dots) and ash (black spots), as well as cracks, burrs, from the obvious defects of skin and other profiles.(1050 aluminum)
Sixth, degree of oxidation
Thickness of oxide film should reach 10 microns. When you purchase may be classified at the profile surface light to see if they can wipe the surface of the oxide film.