Does the .1% Pb limit apply to any single point on the pwb, or can it be
an average of readings from several different points?
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Timothy McGrady
Sent: Sunday, October 29, 2006 7:57 AM
To: [log in to unmask]
Subject: Re: [LF] Leadfree assembly contaminated?
Gen:
I agee with Ioan. XRF mesurements of in situ solders are not easy and
not very accurate, considering that in your case any Pb would probably
not be uniformly distributed. However, knowing what the European
enforcement bodies are likely to do, if you have the solder tested via
XRF and the Pb concentration is low - not just below 0.1%, but anywhere
near 0.1% - they are unlikely to challenge your claim that the product
is compliant. If they saw 40% lead with an XRF, they would likely
proceed to quantitative analysis by ICP-AES to confirm the high lead
reading. Some enforcement authorities might be more agressive and go
straight to quantitative analysis, but they will have to be quite sure
of themselves if they want to prosecute someone for Pb values a little
higher than 0.1%, particularly if you did your due diligence and had
your reflowed solder checked and can document that with a test
certificate. The only problem with having an instrument manufacturer do
the test is that they likely do not qualify as an independent test lab
and cannot give a certificate that would hold the same weight as one
from a laboratory.
Tim McGrady
----- Original Message -----
From: "Tempea, Ioan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, October 28, 2006 6:38 PM
Subject: Re: [LF] Leadfree assembly contaminated?
Gen,
how could you do that? I bet nobody else did it, including ourselves.
As per our experience and XRF measurements you should be OK if the
wicking of the pads is very very good. For a very well wicked pad, no
spikes or little islands, just a flat pad left after the cleaning, we
measured about 3 to 4% Pb in the coating layer. Imagine adding a
comparatively huge volume of lead-free solder on top of it, you end up
with the Pb diluted well below the 0.1% treshold.
Of course, you don't kow how well your CM did the cleaning, but if you
ask them to change the IC again, the Pb will surely go away. Now, how
confident are you in your PCB quality to do that, only you can answer.
We have an XRF and I tell you from my painful experience that measuring
in electronics using this technology is not a piece of cake. Therefore,
if you want to qualify the boards, I suggest you contacted XRF machines
manufacturers, tell them you are interested in buying one and have them
check the boards for you, for a test. Not too orthodox, but life is not
always fair, is it?
Good luck,
Ioan
-----Original Message-----
From: Leadfree
To: [log in to unmask]
Sent: 27/10/2006 4:20 PM
Subject: [LF] Leadfree assembly contaminated?
Our CM placed and reflowed an IC with SnPb leads on a leadfree assembly.
Then they removed it and replaced it with the leadfree part.
Is this assembly contaminated with Pb to a level that would be a
failure under RoHS? We have several boards in limbo.
Does anyone know of a lab capable of determining this, in Canada?
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