To conform to IPC-4556, manufacturers must employ precise testing methods. is the industry-standard tool for verifying that the nickel, palladium, and gold layers fall within the specified thickness ranges. Beyond thickness, the specification also covers: Visual references for surface quality. Adhesion and Solderability testing. Cleanliness and electrolytic corrosion standards. Conclusion
) to address nickel hyper-corrosion, and provided better imaging for inspecting palladium and nickel layers. ipc4556 pdf
