1、看表面和断面。如果表面和断面光亮,就表明铝材的合金成分高,比较纯。如果是断面发黑，或者说表面色泽不光亮，就表明这种铝材是用回收料做的。
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、看强度。用两种铝材，好料和次料碰撞，好的料不会有太大的磕迹，坏的料就会沉下去一个沟槽。
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、看报价。材质不一样，表面处理不一样，铝材的壁厚不一样，报价就不一样，差很远。如果报价低的，多半是次料回收，壁厚太薄，同样1米，人家重4KG的，它才两公斤多,人家壁厚是5MM的,它才1.2MM。
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.
家里换门窗，什么样的铝材做门窗好啊？
How to make doors and windows for doors and windows?
做门窗所用的铝材要挑性价比高的，建议如下：

The aluminum materials for doors and windows should be selected with high cost performance.
1、窗轮要好，压玻璃的胶条要耐旧耐腐蚀；
1, the window wheel is better, and the glass strip should be resistant to old corrosion resistance.
2、门窗密封性能要好；
2, doors and windows sealing performance is better.
3、纱页要与材料配套，纱网要不生锈的且厚度及密度要好；
3, the yarn pages should be matched with the materials, and the gauze is not rusty, and the thickness and density are better.
4、性价比要高，型材的表面处理层要是电泳的，且电泳层要厚；
4, high cost performance. The surface treatment layer of the profiles should be electrophoretic and the electrophoresis layer should be thick.
5、安装框架要打到水平线。
5, the installation frame must be horizontal.
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