Firstly, distinguish the quality of FPC circuit boards from their appearance:

1. Standards for size and thickness.

Customers can measure and check whether the product meets the thickness and specifications specified in the production drawings.

2. Light and color.

Circuit boards are all covered with ink. If the color of the board is not bright and there is less ink, it indicates that the quality of the board itself is not good.

3. Weld appearance.

Due to the large number of parts on the circuit board, poor welding can lead to parts falling off easily. Careful identification can provide a preliminary assessment of quality.

Secondly, high-quality FPC circuit boards have the following requirements:

1. It is required that the components be easy to use after installation, that is, the electrical connection should meet the requirements;

2. The line width, thickness, and distance of the line meet the requirements to avoid heating, open circuit, and short circuit of the line;

3. The copper skin is not easily peeled off under high temperature;

4. Copper surface is not easily oxidized;

5. No additional electromagnetic radiation;

6. The appearance of the circuit board is not deformed, and the error between its hole position and circuit design is within the allowable range;

7. Require resistance to high temperature, humidity, and special environments;

8. Meet the installation requirements for mechanical properties.