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January 2005

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Thu, 6 Jan 2005 14:10:27 -0500
Content-Type:
text/plain
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text/plain (96 lines)
Ladies and Gentlemen,
There is NO actual or proposed EU legislation to ban the use of bismuth.  Period.  Yes, Bi is a byproduct of lead mining but more and more of it now is coming as a byproduct of mining other metals (tungsten).  Check out the US Geological Survey web page for bismuth.
http://minerals.usgs.gov/minerals/pubs/commodity/bismuth/bismumcs04.pdf

And as Pratap points out, it is not SnBi by itself that is bad, it is the SnBiPb alloy that is the problem.  Mixing SnBi with SnPb, as shown by Boeing is REALLY bad.  However, Tom Woodward (Boeing) has also shown that smaller amounts of Bi is actually not a problem, at least not to the same extent.  I do not want to put words in Tom's mouth that everything is hunky dory about lesser amounts than in the SnBi eutectic, but things do not look as bad as first thought for alloys containing single digit amounts or Bi.

regards,
Bev Christian
Research in Motion

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Richard Schumacher
Sent: January 6, 2005 12:03 PM
To: [log in to unmask]
Subject: Re: [LF] The use of Bismuth


Dewey, what finish alloys use up to 3% Bi?

Genny, what indications have you seen that the EU may eventually want to ban
Bi?


> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of 
> Whittaker, Dewey (AZ75)
> Sent: Thursday, January 06, 2005 10:30 AM
> To: [log in to unmask]
> Subject: Re: [LF] The use of Bismuth
> 
> 
> We are seeing components with this finish. There is data to 
> support the acceptability of a final lead finish containing 
> up to 3% Bismuth. Dewey
> 
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of Genny Gibbard
> Sent: Thursday, January 06, 2005 9:15 AM
> To: [log in to unmask]
> Subject: [LF] The use of Bismuth
> 
> 
> So I am curious, what are people thinking about the use of 
> bismuth in lead free termination finishes.  I am not talking 
> about solder containing Bi. The only supplier I have come 
> across so far specifically mentioning they use Bi is NEC.  
> They have a doc on their website, called "Japan's best kept
> secret" http://www.cel.com/pdf/marcomnews/japan_best.pdf      
>   that claims
> that SnBi is recommended by JEITA, as opposed to the 
> recommendation of JEDEC for Matte Sn.  They make it sound as 
> if a lot of companies are using this plating, but I haven't 
> come across any other components so far that use it. The main 
> concern I have is that I keep getting the impression that the 
> next metal that the EU will be gunning for eliminating is Bi, 
> so it doesn't sound like a smart direction to go.
> 
> Thoughts?
> 
> Genny Gibbard (mailto:[log in to unmask])
> 
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