The difference between the national standard of PCB manufacturing and IPC standards

In the PCB will be divided into IPC level 1, level 2, level 3, level 1 general electronic consumer products, 2 special service electronic products, 3 high-performance electronic products. The higher the level of quality control requirements are more stringent, level 3 in PCB, such as the accuracy of drilling aperture, the thickness and flatness of the hole copper plating, solder resist thickness, etc. than the level 2 tolerance ranges and testing items to be more and more stringent, level 3, strict judgment of the product, whether it is used in civilian, military products to ensure that the product is highly stable, long life can not be interrupted characteristics.