Do you know some characteristics of pcb circuit board

Do you know some characteristics of pcb circuit board
There are 14 important characteristics of PCB. No matter what the internal quality of PCB is, it is almost the same on the surface
It is through the surface that we see the differences, which are critical to the durability and function of PCB in its entire service life.
It is very important that PCB must have reliable performance whether in the manufacturing assembly process or in actual use.
In addition to the related costs, PCB circuit boards may bring the defects in the assembly process into the final product, and may fail in the actual use process, resulting in claims.
From this point of view, it is no exaggeration to say that the cost of high-quality PCB can be negligible.
In all market segments, especially those producing products in key application areas, the consequences of such failures are unimaginable.
Circuit board

These aspects should be kept in mind when comparing PCB prices Although the initial cost is reliable, assured, and the long life products are high, they are still worth their money in the long run
Let's take a look at the 14 most important features of high reliability PCB:
Benefits of 25 micron hole wall copper thickness: increased reliability, including improved z-axis expansion resistance.
The risk of not doing so: air hole or air release, power connection problems during assembly (inner layer separation, hole wall fracture), or failure under load during actual use. IPCClass2 (the standard adopted by most factories) requires a 20% reduction in copper plating.
2. No welding repair or open circuit repair. Advantages: The perfect circuit can ensure reliability and safety without maintenance and risk.
Risk of not doing so: If the repair is not correct, the circuit board will be broken. Even if the maintenance is "proper", there is a risk of failure under load conditions (vibration, etc.), which may lead to failure in actual use.
3. Advantages of cleanliness requirements beyond IPC specifications: improve PCB cleanliness to improve reliability.
Risk of not doing so: The residue and solder accumulation on the circuit board will bring risks to the solder mask. Ionic residues pose a risk of corrosion and contamination on the welding surface, which may lead to reliability problems (poor solder joints/power failures) and eventually increase the possibility of actual failures.
4. The advantage of using internationally known substrates rather than using "local" or unknown brands: improving reliability and known efficiency
Risk of not doing so: Poor mechanical efficiency means that the circuit board cannot perform the expected performance under assembly conditions, for example, high expansion efficiency will lead to delamination, disconnection and warping problems. Reduced electrical characteristics may result in poor impedance effectiveness.
5. Strictly control the service life of each surface treatment. Advantages: weldability, reliability, reducing the risk of moisture intrusion
Risk of not doing so: due to the metallographic changes in the surface treatment of old circuit boards, welding problems may occur, moisture intrusion may lead to delamination, internal layer and hole PCB assembly process and/or actual use Wall separation (open circuit) and other issues