1. surface: check whether the surface material of the product is flat or not. If you see scratches and deformation, it is produced by waste (scraps). This kind of hinge looks ugly and makes your furniture classless.
Surface treatment: Most hinges are plated with nickel. Now, because many factories reduce costs, only a thin layer of nickel is plated. Real hinges should be plated with a layer of copper acid before nickel plating, which can be very rust-proof. Our Gaoyao Yike Hardware Products Factory is electroplated twice. )
Tip:
Teach you a way to tell whether there is copper plating: if JS doesn't object, you can draw a knife with the power of the artist to see if you can see the brass layer. There is a more intuitive way, that is, looking into the hinge cup, it is generally concave, which is also the most difficult place to electroplate. If the cup shows the same black water level or can see the iron color, it proves that the electroplating layer is very thin and there is no copper plating. If the color and brightness in the cup are close to those in other parts, is it very simple?
2. Spring performance: As we all know, the hinge key plays the role of switch, so this is very important. The key is taken from the outer spring and inner spring of the hinge and the rivet assembly. The outer spring is a leaf spring and the inner spring is a strip spring, both of which have to undergo a certain heat treatment. They are too hard, easy to break, and too soft to close the door. Some JS purchased low-priced spring fittings, which caused the door panel to close badly, or the spring broke and the door panel fell off.
Tip:
When purchasing hinges (except hydraulic hinges), close the hinges manually and listen to the sound of the hinges closing. Is it crisp? It's good to be crisp. If it's a dull door closing sound, it proves that the spring strength is not enough and there is something wrong with the material thickness. Is the hinge cup loose? If there is looseness, it proves that the rivet is not firmly riveted and easy to fall off. Close it several times to see if the indentation on the cup mouth is obvious. If it is obvious, it proves that there is something wrong with the thickness of the cup material and it is easy to "explode the cup".
It seems a little long. I'm a hinge manufacturer. Anyway, I summed up a little experience. I hope I can help you.