There are several kinds of aluminum alloy doors and windows
Aluminum alloy doors and windows material aluminum alloy doors and windows deformation, sliding and other phenomena are common. Consumers should note the following points: a look at the material. Material in the material on the main six can refer to:
1, the thickness: aluminum alloy sliding doors have 70 series, 90 series of two, residential aluminum alloy sliding door with 70 series can be. The number of series indicates the number of millimeters in the size of the frame thickness. Aluminum alloy sliding window has 55 series, 60 series, 70 series, 90 series four kinds. Series selection should be based on the size of the window hole and the local wind pressure value. The aluminum alloy sliding window used as a closed balcony shall be not less than 70 series.
2. Strength: Tensile strength should reach 157 Newton per square meter of millimeters, yield strength to reach 108 Newton per square millimeter. When buying, you can use the hand to bend the profile, after the release should be able to recover.
3. Chroma: the same aluminum alloy color should be consistent, such as color is obvious, that is not recommended.
4. Smoothness: 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), as well as cracks, burrs, aluminum doors and other obvious defects in the profile.
6. Oxidation degree: oxide film thickness should reach 10 microns. When you buy, you can tap the surface of the profile to see if the oxide film on its surface can be wiped off.
Very much, basically every one is different
