How to distinguish between good and bad fencing?

    Check if the profile is 6 meters long, if there is obvious distortion, the distortion can not be used, because in the cast aluminum window, the type of material is to be distorted, so this type of material always exists in the original twist strain of the window.

     The hardened hard material (iron) on the outer surface of the profile is slightly stretched and leaves a white scratch on the outer surface of the profile. If it can be erased by hand, it indicates that the oxide film has not been erased. If not When the hand wipes the white scratch, the oxide film has been scratched off. It is said that the oxide film is weak, the oxide film is too thin and the oxidation quality of the material is poor. The quality of aluminum is related to many factors.

 

     The above is a very simple and simple introduction. It is mainly for users to buy aluminum materials based on raw material selection. Don't be deceived. When you buy materials, you must look at the inspection report, listen to the salesperson to open the river, and greedy. Buy back Substandard aluminum is very dangerous.