久久综合色一综合色88-粉嫩av一区二区三区天美传媒-亚洲精品无码一区二区卧室-av国产熟妇露脸在线观看-最新国产美女被暴菊视频-亚洲AV无码乱码国产精品麻豆亚洲一区二区三区AV-精品国产18久久久久久洗澡-国产91高清在线观看-野花社区在线观看高清视频动漫-国产精品嫩模大尺度视频

Features of low-quality aluminum profiles:

1. Unqualified chemical composition. The cost of aluminum profiles doped with a large amount of miscellaneous aluminum and waste aluminum in the product is greatly reduced, which will lead to unqualified chemical composition of architectural aluminum profiles and seriously endanger the safety of construction projects.

2. low-quality aluminum profile greatly reduce the sealing time, reduce the loss of chemical agents, cost reduction, but the corrosion resistance of the profile is also greatly reduced.

3. Thin oxide film thickness. The national standard stipulates that the oxidation film thickness of building aluminum profile should not be less than 10um (micron). Thickness is not enough, aluminum profile surface easy to rust, corrosion. Sampling inspection of some proletariat, factory site, production license, certificate of aluminum profile, its oxidation film thickness only 2 to 4um, some even no oxidation film. According to the expert estimate every reduce 1um oxidation film thickness, every ton of profile can reduce the cost of electricity consumption more than 150 yuan.

4. Chemical composition is unqualified. Aluminum profiles mixed with a large amount of miscellaneous aluminum and waste aluminum can greatly reduce the cost, but will lead to unqualified chemical composition of construction aluminum profiles, seriously endanger the safety of construction projects.

Unqualified aluminous profile, because air, rainwater, sunshine wait for influence when using, bring about aluminous profile to be out of shape, cause glass to break even, fall off wait for a phenomenon.