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Date: | Fri, 20 May 2005 10:04:30 +0100 |
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This has been discussed on this and other forums previously within the
last year.
We have been told certain types of finish chemistry for both ENIG and
Immersion Sn can contain levels of Pb and Cd as stabilising agents and
this can make the material deposited very close to or exceeding the RoHS
limits. However, the chemistry suppliers are working on this and don't
expect this to a problem in the long term. That said, if you want a RoHS
compliant PCB now you had better check with your supplier about the
chemistry they use to make sure they can provide it!
We've used ENIG for years as our finish of choice for SMT/mixed
technology with HASL left for conventional PTH only, but are considering
moving to Immersion Ag as a standard for both on any reasonable volume
RoHS compliant product where shelflife should not be an issue. This
problem with non-RoHS compliant ENIG is part of that decision, but
mostly the occasional batch of ENIG that has solderability problems with
no-clean fluxes is a difficulty that won't go away. Pb-F HASL is
available but not falt enough for SMT I feel and I understand this
process still has its own problems for the PCB manufacturers too - maybe
early days?
Does anyone think Immersion Ag is a very bad idea?
Nigel Burtt
Production Engineering Manager
Dolby Labs - European HQ
Email: [log in to unmask]
Tel: +44 (0)1793 842132 [direct line with voicemail]
Fax: +44 (0)1793 842101
-----Original Message-----
From: Jason Gregory [mailto:[log in to unmask]]
Sent: 19 May 2005 23:17
Subject: Re: ENIG Board finish and RoHS
Methinks that is a really good question.
Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)212-0844 cell
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bob Donaldson
Sent: Thursday, May 19, 2005 4:58 PM
To: [log in to unmask]
Subject: [TN] ENIG Board finish and RoHS
I had an interesting question come up. One of my customers questioned
whether ENIG board finishes were RoHS compliant because in their metal
finishing world nickel plating baths commonly used lead in them to help
in the plating. So I asked a boardshop I was working with if the ENIG
processing they were using had lead in the nickel plating baths. They
said it did so we both were wondering if this makes ENIG a non compliant
finish for RoHS. Can someone please shed light on whether this is true
or not?
If it is compliant must the platers remove lead form their baths or is
the concentration so low it falls within the accepted criteria?
Thanks,
Bob D.
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