Aluminum alloy door how good material and good
Thickness, hardness of the material strength, and so on
1, thickness: the thickness of the material
2, the strength: tensile strength should be up to 157 Newton per square meter, yield strength to reach 108 Newton per square millimeter. When buying aluminum doors and windows, you can use the hand to bend the profile, after the release should be able to recover.
3, color: the same aluminum alloy color should be consistent, such as color is obvious, that should not buy.
4, flatness: check the aluminum alloy surface, should be no depression or bulging.
5, gloss: aluminum doors and windows to avoid the purchase of the surface to open the bubble (white) and ash (black spots), and cracks, burrs, leather and other obvious defects in the profile.
6, the degree of oxidation: oxide film thickness should reach 10 microns. Optional aluminum doors and windows can be drawn in the profile surface, look at the surface of the oxide film can be erased.
