1. Evaluate the weight of the material. Good quality hinges have a thick feel and smooth surface; on the contrary, inferior alloys are generally welded with thin iron sheets, which are relatively light;

2. Evaluate the quality of the hand feel. The hinge with better quality is softer when it is opened, and it will automatically rebound when it is closed to 15°, and the rebound force is even, you can actually feel it when purchasing;

3. Evaluate the quality to see the details. The high-quality hinges have fine workmanship, and the design will consider the volume of the sound produced by the switch, and some hinges have achieved a mute effect. Inferior hinges are generally jerky on and off, and even accompanied by harsh noises;

In addition, when purchasing a hinge, you should also pay attention to the reset performance of the hinge spring. You can open the hinge to 95° and press both sides of the hinge firmly to observe whether there is deformation or breakage.