Dave,
You are right about stacking and shelf life. In this area ENIG is  
unsurpassed.
 
Other benefits include rivetiing the thru hole with Ni, ENIG boards give  the 
highest value for IST testing.
 
ENIG does not tarnish over time, it does not form micro- voids and more  
important it does not corrode in "S" rich environments.
 
The Ni also protects the underlying copper from dissolution at  assembly.
 
Shops that practice process control should have no problems making ENIG  
boards that do not exhibit any Ni corrosion.
 
Best of luck in your decision.
 
 
Regards
George Milad
George Milad
National Accounts  Manager for Technology
Uyemura International Corp (UIC)
249 Town Line Rd  
Southington CT 06489
[log in to unmask]
Cell: (516) 901  3874



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