I think the problem is that knowing how much Pb is where doesn't really
give a route map to its elimination, so nobody has thought in this way.
The usual suggested route, in outline, is:
1) Change board finish to eliminate Pb (example: from HASL to Ag or OSP
etc)
2) Wait for component people to bring out lead free and lead free
(temperature) rated devices
3) Change the paste/solder.
In parallel/off line
4) Audit component suppliers for Pb-free availability dates types etc.
5) Pb-free paste/solder can be used now to evaluate approve types,
explore production parameters, gain experience, verify reliability and
so on.
This way ensures compatibility and gives a "change one thing at a time"
path. 1) and 2) are to your specification, but most people have no
control over 2, and availability of components is the real decider on
switching.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of d. terstegge
Sent: Monday, October 13, 2003 10:31 AM
To: [log in to unmask]
Subject: [TN] How to estimate the amount of lead in a PCB-Assembly ?
Hi Technet,
I posted this same message to the LeadFree forum last week, but didn't
receive any usefull answers (except a mentioning of the availabliity of
Pulverization & Analytical Techniques), so I try again here :
I just received a question from one of our customers, asking how much
lead their products contain. The answer will help them to make decisions
about changes to their (future) boarddesigns. This seems not so easy to
answer, as lead is introduced in the product as HASL, as solderpaste, as
wave soldered joints and as finishing of component terminations. I don't
want to reinvent the wheel, therefore I'm looking for recommendations on
a practical approach to deal with this question, that I'm sure many of
you have had before. All input is appreciated.
Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net
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