[tinwhiskers] Re: [LF] FW: [SMART] Very useful RoHS review conference report
- From: "Bob Landman" <rlandman@xxxxxxxxxxxxxxxxx>
- To: <tinwhiskers@xxxxxxxxxxxxx>
- Date: Tue, 26 Jan 2010 18:15:59 -0500
Wouldn't touch the stuff with a 20 meter pole! Tin WILL whisker. It has to.
The intermetallic between the copper and the tin sets up a stress that
(according to one theory) shoves atoms of tin around (copper atoms drift into
the tin layer).
See this paper
http://www.hlinstruments.com//RoHS_articles/TinWiskerCause2009ApplPhysLett94.pdf
See this list for the problems with immersion tin (which is what that finish is)
http://www.smtnet.com/index.cfm?fuseaction=search_submit&searchstring=immerse%20tin&collection=site_forum
We use NiAu and have no problems whatsoever with black pad. Don't at all like
ImAg as it's shelf life depends on how well the bags are sealed. We might just
have 100 boards fabricated and may only stuff 20 of them at a time. Parts in
our products are expensive as we are an industrial rated (-40 to +85C) high rel
manufacturer.
Bob Landman
H&L Instruments, LLC
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew Glass
Sent: Tuesday, January 26, 2010 5:41 PM
To: Bob Landman
Subject: [tinwhiskers] Re: [LF] FW: [SMART] Very useful RoHS review conference
report
Hello Bob,
Really appreciate all the information Thanks.
Has anyone checked into OMICRON/TIN.
As a manufacturer of PCBoards I ran into this product some years ago. The
chemist said it will not whisker.
--
THANKS
Andrew Glass
AGCO Inc.
500 Rampart Range Road
Woodland Park Co. 80863
1-719-687-6875
FAX 1-719-687-6880
Andy@xxxxxxxxxx
Tuesday, January 26, 2010, 2:32:10 PM, you wrote:
> Sadly Nigel,
> The resulting RoHS legislation says otherwise. I don't think
> namecalling does any good. I'm of European heritage (mum was
> Canadian, fathers family was Romanian). The problem is a problem with
> humans in general, and politicians in particular (of all parties). To
> quote the Bard, the fault lies with ourselves.
> Clearly the science is presently on the side of lead. It appears thus
> far not to matter. No-one seems to offer a good explanation as to why
> that is so.
> Kindest regards,
> Bob Landman
> H&L Instruments
> On Jan 26, 2010, at 9:58 AM, Nigel Burtt <njb@xxxxxxxxxxxxxxxx> wrote:
>> Perhaps perjoratively referring to those disagreed with as "lefties"
>> and "loonies"
>> might be why the valid opinions are ignored should you ever care to
>> share them with people who can actually use the information to change
>> things.
>>
>> And as a point of fact, the right of the political spectrum in the EU
>> has always held the majority in the EP
>>
>> < http://en.wikipedia.org/wiki/File:EP_Groups_1979-2009.png >
>>
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