High quality PCB need to meet the following requirements:

1, after the installation of components, electrical connection to meet the requirements.

2, PCB prototype line width, line thickness, line distance to meet the requirements, so as to avoid the line heating, circuit, and short circuit.

3, the high temperature of copper is not easy to fall off.

4, there is no additional electromagnetic radiation.

5, the shape is not deformed, so as to avoid the deformation of the shell after installation, screw hole dislocation.

6, High temperature, high humidity and special environment should also be considered.

7, the mechanical properties of the surface to meet the installation requirements.