Firstly - the lead test kits produced for the paint industry do no work
reliably for RoHS work. Surface area to be swabbed is too small, the
indicators are not very accurate and or don't work at the low levels we
are seeking to detect. The same applies to hand held XRF units which
again require about 25 mm sq of surface to work on minimum.
As part of a recent project the UK NPL has looked at various types of
the above and concluded they won't be of much use in the RoHS domain.
Secondly - yes there is lead and cadmium in the Nickel of many ENIG
finishes where they are used as stabilisers in the process. Chemistry
suppliers are looking at the problem and hope to have a practical
solution soon. The issue has been raised at EU level and the UK DTi are
tracking progress on any decisions as to whether this might form another
exclusion.
Regards,
Chris
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: 13 December 2004 18:58
To: [log in to unmask]
Subject: Re: [LF] ECP: [LF] Lead in ENIG plating
Hi Kay, Jerome, IPC LF Listservers,
I tried to send a second note late last Thursday, early Friday striving
to
be much more negative towards your addition of lead to the El-Ni Bath.
The
Internet blinked, so my note disappeared. Hey EIT-JeromeW ! (formerly
IBM-
Endicott JeromeW) maybe that was a good thing.
If you look at the road map published by Soldertec for the last Lead
Free
stage and previous communications on this list with Tin's Kay .1% or
1000ppm is going to eventually be a measurement or a goof-up
(inadvertent,
sporadic addition) limit. At up to 700ppm Pb intentionally added to the
surface in the way you described to help with grain boundaries you risk
being identified as not passing the 1000ppm maximum limit.
On the market proposed by some Lead Free teachers as a Lead Free test
kit
are kits that will probably detect your product as containing lead. Test
them out yourself on your product. Most of these I believe are for
Leaded
paints in Housing units and from what I have read should fail you.
LET LeadFree fail reliability tests or models, if that is the best you
can
do, and don't let your engineers, scientists mess around with adding
Lead
is the best advice. Again alternatively you can ask the EU for an
intentional addition which for now will probably be denied.
Yours in Engineering, Dave
YiEngr, MA/NY DDave
<My previous note------------->
Well it seems like you are maybe safe. Yet pay careful attention to any
upcoming rules. If you see intentional in any of them watch out and
start
squaking like mad through the proper channels even EU legally. Remember
your competitors can say (Gee I didn't know) and can get away with
adding
lead to the bath and go far beyond the limits you noted of 700ppmw.
For NOW I think we have to go on .1% (1000ppm) maximum as measured as
the
only standard for LeadFree.
BTW, I do believe it is a bad practice to add ANY lead and it is better
to
find a substitute or just let the FAILURES occur. Intentionally adding
lead
without some kind of EU approval is bad business/publicity.
As alternative you can go after an intentional lead add like they have
with
brass for machining.
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Search previous postings at: http://listserv.ipc.org/archives
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