The rapid development of the mobile phone, electronics, and communication industries promoted the continuous growth and rapid growth of the PCB circuit board industry. People have more requirements for the number of layers, weight, precision, materials, colors, and reliability of components.

However, due to fierce market price competition, the cost of PCB board materials is also on a rising trend, more and more manufacturers are monopolizing the market with low prices to enhance their core competitiveness. However, behind these ultra-low prices are obtained by reducing material costs and process manufacturing costs. Devices are usually prone to cracks (cracks), scratches, and their precision, performance and other comprehensive factors have not reached the standard which seriously affects the solderability and reliability of the product.

Faced with a wide variety of PCB circuit boards on the market, there are two ways to distinguish the quality of PCB circuit boards. The first method is to judge from the appearance, and the other is to judge from the quality specification requirements of the PCB board itself.

Methods to judge the quality of PCB circuit board:

• Distinguish the quality of the circuit board from the appearance

1. Standard rules for size and thickness.

The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check the thickness and specifications of their own products.

2. Light and color

The external circuit board is covered with ink, and the circuit board can play the role of insulation. If the color of the board is not bright and there is less ink, the insulation board itself is not good.

3. The appearance of the weld

The circuit board has many parts. If the welding is not good, the parts are easy to fall off the circuit board, which will seriously affect the welding quality of the circuit board. It is very important to identify carefully and have a strong interface.

• High-quality PCB circuit boards need to meet the following requirements

1. The components are required to be easy to use after installation, the electrical connection must meet the requirements;

2. The line width, line thickness, and line distance of the line meet the requirements to prevent the line from heating, breaking, and short-circuiting;

3. The copper skin is not easy to fall off under high temperature;

4. The surface of copper is not easy to oxidize, if it oxidizes, it will be broken soon;

5. There is no additional electromagnetic radiation;

6. The shape is not deformed, to avoid deformation of the housing and dislocation of the screw holes after installation. Now they are all mechanized installations, the hole position of the circuit board and the deformation error of the circuit and the design should be within the allowable range;

7. High temperature, high humidity, and special environment resistance should also be considered;

8. The mechanical properties of the surface must meet the installation requirements;