Due to switch contact wiping, the thin ENIG gold will wear off the PWB depending on what the life of your product is. You should run a life test, do pre/post electricals (make sure you check contact bounce) and pull the switches apart for examination at the end of the test. Typical switch domes ride on 4 corners so have "redundancy" built into them. After a typical "1 million" actuation life your domes will be riding on the nickel since all the gold will be wiped off. My experience with ENIG PWBs/PWAs is that the gold is not sufficient to protect the nickel from corroding during a cycled humidity test. I've seen gold flake off PWBs due to corrosion cells forming underneath the gold. Best regards, Gregg At 10:21 AM 6/17/02, Rick Fudalewski wrote: >Bev > >reason why i was asking about the elni/au - customer had recommended to >their OEM customer - but was informed that the immersion gold did not >stand up to humidity testing - is there something that went wrong? > >Rich F > >FCT