Core guide: aluminum alloy sliding door has 70 series and 90 series, and aluminum alloy sliding window has 55 series, 60 series, 70 series and 90 series. The series number represents the millimeter number of the door frame thickness structure size. The selection of the series should be determined according to the size of the window opening and the local wind pressure value. 70 series can be used for the aluminum alloy sliding door inside the residence, and the aluminum alloy sliding window used as the closed balcony should not be less than 70 series.
It is common for aluminum alloy materials to appear deformation of doors and windows, push-pull immobility and so on. Consumers should pay attention to it when they buy.
1、 Identification of signs
Regular or licensed manufacturers shall mark the obvious parts of their aluminum alloy products, including: manufacturer name or trademark, product name, product model or mark, manufacturing date or number. There should be obvious words and signs of "moistureproof", "handle with care" and "upward" on the packing case.
2、 Surface quality
The surface quality of doors and windows directly affects the decoration effect of the whole wall after installation. When checking the surface quality of doors and windows, attention should be paid to the following aspects:
A. there should be no obvious damage to the decorative surface of doors and windows, which means that the protective film on the surface of doors and windows should not have scratch marks.
B. There shall be no obvious color difference on the colored surface of adjacent components on doors and windows.
C. There should be no aluminum chips, burrs, oil spots or other stains on the surface of doors and windows, and there should be no adhesive overflow at the assembly joint.
3、 Dimensional deviation
The minimum dimension deviation of aluminum alloy door and window frame is better.
4、 Aluminum alloy door and window components
Aluminum alloy door and window components should be firmly connected, and corrosion-resistant filling materials should be used to make the connection part sealed and waterproof.
5、 Look at the material
There are mainly six aspects to refer to in terms of materials and materials:
1. Thickness: there are 70 series and 90 series aluminum alloy sliding doors, and 70 series can be used for aluminum alloy sliding doors in residential buildings. The series number represents the number of mm in which the door frame thickness is constructed. There are four kinds of aluminum alloy sliding windows: 55 series, 60 series, 70 series and 90 series. Series selection should be based on the size of window opening and local wind pressure value. Aluminum alloy push-pull windows used as closed balcony should not be less than 70 series.
The yield strength should reach 157 mm / m2. When purchasing, you can use your hand to bend the profile moderately, and you should be able to return to its original state after releasing it.
3. Color: the color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable to purchase.
4. Flatness: check the surface of aluminum alloy profile, there should be no depression or bulge.
Choose and buy aluminum alloy profile (5) to avoid defects such as blisters and black spots on the surface of doors and windows.
6. Oxidation degree: the thickness of oxide film should reach 10 μ M. When purchasing, you can mark the profile surface to see whether the oxide film on the surface can be wiped off.