Explain a bit more - you pasted an ENIG board and then what? - just

wiped the paste off and the pads looked grey or did you wash the paste

off? If you just wiped them off you probably didn't get all the paste

off.



We have seen no problems with ENIG boards. We have used them for many

years with standard SnPb paste and now with SAC pastes.



Yes the ENIG finish can have inherent problems but if you have a good

pcb supplier then these should not be an issue.



Regards,

Chris

____________

 

-----Original Message-----

From: Leadfree [mailto:[log in to unmask]] On Behalf Of Phil Bavaro

Sent: 17 May 2005 19:38

To: [log in to unmask]

Subject: [LF] Enig finish & lead free pastes



During some printability testing that we have been performing, we

noticed

certain pastes were able to remove the gold color off of some of the

ENIG

test boards.  Our immediate assumption is that the gold dissolved, as

the

surface that was in contact with the gold appears to have the nickel

showing through.



Keep in mind that this was just a print experiment and did not involve

the

oven at all.



Anyone else run into this type of anomaly?



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