How to distinguish is not inferior aluminum profile

Aluminum is divided into raw aluminum and cooked aluminum, raw aluminum is 98% of the aluminum, the nature of the contrast brittle hard, can only foundry goods; Cooked aluminum is more than 98% aluminum, soft properties, can be rolled or rolled a variety of utensils. So when ordering aluminum profiles, how to distinguish whether it is inferior aluminum profiles?

Characteristics of inferior aluminum profiles:

1. Chemical composition is unqualified. The cost of aluminum profiles doped with a lot of miscellaneous aluminum and waste aluminum in commodities is greatly reduced, but it will cause the chemical composition of aluminum profiles to be unqualified, which seriously endangers the safety of construction projects.

2, the residual aluminum profile many cut closing time, reduce the loss of chemical reagents, the cost is reduced, but the corrosion resistance of the profile is also greatly reduced.

3, thin oxide film thickness. The national standard rules of aluminum profile oxide film thickness should not be less than 10um(micron). Thickness is not enough, the appearance of aluminum profiles easy to rust, corrosion. Sample test in some proletarian name, site, production license, certificate of aluminum profile, its oxide film thickness is only 2 to 4um, some and even no oxide film. According to the expert budget each cut 1um oxide film thickness, each ton of profiles can cut power consumption more than 150 yuan.

4, the chemical composition is not qualified. The aluminum profile mixed with many miscellaneous aluminum and waste aluminum can greatly reduce the cost, but it will cause the chemical composition of the aluminum profile to be unqualified, which seriously endangers the safety of the construction project.