IPC-4550-FAM is a family of specifications for plating for printed boards.
This kit includes the following collection of IPC standards:
IPC-4552 Specification for Electroless Nickel/Immersion Gold (ENIG) Plating for Printed Circuit Boards
IPC-4553 Specification for Immersion Silver Plating for Printed Boards
IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards
IPC-4556 Specification for Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) Plating for Printed Circuit Boards