1. Check the degree of oxidation: When purchasing, you can lightly scratch the surface of the profile to see if the oxide film on the surface can be wiped off. Of course, this should not be done directly on the sample window. The owner can operate on the material displayed by the merchant.
2. Look at the color: the color of the same aluminum alloy profile should be consistent. If the color difference is obvious, it is not suitable for purchase. Generally, the cross-section color of a normal aluminum alloy profile is silver-white with a uniform texture. If the color is dark, it can be determined that it is made of recycled aluminum or waste aluminum forged in the furnace.
3. Check the flatness: Check the surface of the aluminum alloy profile, there should be no dents or bulges. The aluminum profile processed by regular manufacturers has a flat and bright surface. If it is a small workshop, due to the machine or raw materials, the profile surface will have slight bumps. The balcony window synthesized by such aluminum alloy profiles is most likely to oxidize and deform in the later stage.
4. Look at the strength: When purchasing, you can bend the profile moderately with your hands. If the profile can be bent without any effort, then it can be determined that the strength of the aluminum profile does not meet the standard. In addition, the strength of the profile is not the harder the better. Aluminum has a certain toughness and is not a hard material. It can be forged into different shapes by utilizing this feature. Therefore, the owner needs to select the brand and observe carefully when purchasing.
5. Look at the thickness: the commonly used 70 and 90 series aluminum window profiles should have a wall thickness of 1.2-2.0 mm. The national standard for the wall thickness of balcony window aluminum profiles is 1.2 mm. The wall thickness of balcony window profiles is 1.4-1.6, and the heavy parts of the upper and lower beams of frameless windows are 3-4 mm thicker, far exceeding the national standard.
6. Glossiness: Avoid purchasing aluminum alloy doors and windows with open bubbles and ash residue, as well as profiles with obvious defects such as cracks, burrs, and peeling. If there are any of the above phenomena, it can be determined that it is recycled aluminum or waste aluminum secondary processing molding. Such materials are prone to cracking and oxidation in the later stage due to uneven texture and messy alloy ratio.
