We've been there too and just wicked it off. It's really sad that a couple pads that have Pb on them out of maybe 200 pads would make any real difference to the precious environment, when the contribution of Pb on a completely SnPb board won't affect the environment anyway. If I did leave a couple pads with 10% Pb buried under SAC305 would the Pb police really find it? If they were looking that close then the real motivation for this Pb ban is purely monetary. I can hear it now "Hey your product is non-compliant, it had a little too much Pb on two pads, so here's your fine, supply conclusive evidence the next shipment will be truly compliant, and by the way we're watching you from now on, you earth polluter!"
Best Regards,
Dave Snyder
Manufacturing Engineering Manager
HME
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-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, December 08, 2006 9:13 AM
To: [log in to unmask]
Subject: Re: [LF] Contamination
Pearl,
I was in this situation and it is OK. Just make sure the wicking is thorough and leaves really flat pads. We measured 4 to 10 % Pb on cleaned pads, depending on the quality of wicking. But this is only a thin layer on top of which you put a fair amount of new solder, which will dilute the Pb content. The more solder you put, the better it is from this point of view.
After soldering the new components we measured Pb below 0.1%. The measurements were in the bulk of solder present at the toe. What was really under the lead will remain unknown.
Good luck,
Ioan
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of pearl petras
Sent: Friday, December 08, 2006 11:41 AM
To: [log in to unmask]
Subject: [LF] Contamination
So...
An assembly house installs one SnPb component on a leadfree assembly.
This has never happened to anyone else has it???
Two different assembly contractors in less than two months have done the same thing. The first case, the customer was willing to accept RoHS 5 boards, so we never tested to determine whether there was unacceptable levels of contamination.
Has anyone ever had testing done to see if Pb can be acceptably removed by the following process:
Remove component with rework machine
Wick off all remaining solder from pads with soldering iron
Replace tip on iron
Hand solder new leadfree component with leadfree solder onto the board.
0.1%...I keep having 0.1% running thru my head...
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