1. Look at the materials. The aluminum profiles used for high-quality aluminum alloy doors and windows, thickness, strength and oxide film, etc., shall comply with the relevant national standards, the wall thickness shall be above 1.2 mm, the tensile strength shall be 157 Newtons per square millimeter, and the yield strength shall be per square millimeter. At 108 Newtons, the oxide film should be 10 microns thick. If the above standards are not met, this means that the inferior aluminum alloy doors and windows cannot be used.
2. Look at the processing. High-quality aluminum alloy doors and windows, fine processing, exquisite installation, good sealing performance, and easy to switch. Inferior aluminum alloy doors and windows, blindly selected aluminum profiles and specifications, processing rough and shoddy, sawing instead of milling, not installed as required, poor sealing performance, not only leaking wind and rain and glass bursting, but also encounter strong winds and external forces It is easy to scrape or knock down the push-pull part or the glass, and damage the person.
3. Look at the price. Under normal circumstances, high-quality aluminum alloy doors and windows due to high production costs, the price is about 30% higher than inferior aluminum alloy doors and windows. Some aluminum alloy doors and windows made of aluminum profiles with a wall thickness of only 0.6-0.8 mm have much lower tensile strength and yield strength than the relevant national standards, and are very unsafe to use.
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