ENEPIG works exceptionally well for both tin-lead (SnPb) and lead-free (SAC) soldering, as well as gold and aluminum wire bonding.
The Definitive Guide to IPC-4556: Understanding ENEPIG for Printed Circuit Boards ipc-4556 pdf
The IPC-4556 PDF is intended for:
Protects the palladium from environmental oxidation and maintains a low contact resistance for keypads and switches. Testing and Quality Assurance Protocols ENEPIG works exceptionally well for both tin-lead (SnPb)