1, look at the surface and section. If the surface and section are bright, it indicates that aluminum alloy has high composition and purity. If the section is black, or the surface is not bright, it shows that this kind of aluminium material is made of recycled materials.
2, look at the intensity. With two kinds of aluminium material, good material and secondary material collision, good material will not have too much scratch, bad material will sink a groove.
3, look at the offer. Different materials, different surface treatment, different wall thickness of aluminium, different quotations, far from. If the quotation is low, most of them are recycled secondary materials, the wall thickness is too thin, the same 1 meter, people weigh 4KG, it's only two kilograms, people's wall thickness is 5MM, it's only 1.2MM.
How to make doors and windows for doors and windows?
The aluminum materials for doors and windows should be selected with high cost performance.
1, the window wheel is better, and the glass strip should be resistant to old corrosion resistance.
2, doors and windows sealing performance is better.
3, the yarn pages should be matched with the materials, and the gauze is not rusty, and the thickness and density are better.
4, high cost performance. The surface treatment layer of the profiles should be electrophoretic and the electrophoresis layer should be thick.
5, the installation frame must be horizontal.
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