What is IPC standard for PCB ?

The Global Association for Electronics Manufacturing. 

IPC was founded in 1957 as the Institute for Printed Circuits Board. 

IPC is the global association that helps OEMs, EMS, PCB manufacturers, cable and wire harness manufacturers and electronics industry suppliers build electronics better. 

IPC members strengthen their bottom line and build more reliable, high-quality products through proven standards, certification, education and training, thought leadership, advocacy, innovative solutions and industry intelligence.

IPC Standards Tree as below: