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August 1999

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Subject:
From:
Michael Fenner <[log in to unmask]>
Reply To:
Michael Fenner <[log in to unmask]>
Date:
Tue, 10 Aug 1999 14:32:56 +0100
Content-Type:
text/plain
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text/plain (175 lines)
Quite a good way of stopping silver migration is to dilute it with about 98 times its
weight in tin and lead.

Mike Fenner
BSP, OX15 4JQ, England
T: +44 1295 722 992
M: +44 789 999 7715
F: +44 1295 720 937


-----Original Message-----
From: Burtt, Nigel <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 10 August 1999 09:41
Subject: [TN] Lead Free Solders


>Smarties and Techies,
>
>Is this fellow (below) correct that any solder containing silver is not
>Bellcore compliant? What about the silver loaded Pb/Sn solder paste that
>many, many of us use.
>
>Are we asking for trouble if our products are expected to be in service for
>many years?
>
>
>Nigel Burtt
>Production Engineering Manager
>Dolby - European HQ
>Email: [log in to unmask]
>Tel: +44 (0)1793 842132
>Fax:+44 (0)1793 842101
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>~~~~~~~~~~~~~~~~~
>
>-----Original Message-----
>From: Mel Pedersen [mailto:[log in to unmask]]
>Sent: Monday, August 09, 1999 6:11 PM
>To: [log in to unmask]
>Subject: Lead Free Solders
>
>
>
>This is a spin-off of the "legal issues" string.
>
>Regarding the legal environmental issues and lead free solder - being a good
>hearted bambi loving company we did some investigation into this.  The only
>suitable lead free solders we found contained silver, which, under the right
>conditions, migrates.  Migration of silver on a circuit board would, of
>course, cause short circuits.  Also, Solder containing silver is not
>compliant with Bellcore criteria (TR-NWT-000078, 3.2.4).  I even spoke with
>Bellcore on this issue, and they are very reluctant to approve the use of
>solder containing silver unless it can be shown that migration is not an
>issue.  This would need to be demonstrated on a case by case basis.  I got
>the impression that this would not be easy to do.
>
>One of the manufacturers we investigated even claimed thier silver
>containing solder was Bellcore compliant.  They were not apparantly aware of
>silver migration or the Bellcore criteria with regard to this.
>
>Apparantly, there are a number of cases of this occurring in the past.
>
>If the lifetime of the equipment is intended to be short (Silver migration
>takes time), then this is not an issue...but Telecommunications equipment
>(at the CO), is intended to have a long lifetime.
>
>Any comments?  It seems to me that this is one issue where the Greenpeace
>types and industry will have a hard time seeing eye to eye.  Maybe we should
>just all live in caves again....instead of surfing the net we could paint on
>rocks....
>
>What are your experiences?
>
>Mel Pedersen                        Midcom, Inc.
>Homologations Engineer                  Phone:  (605) 882-8535
>mailto:[log in to unmask]         Fax:      (605) 882-8633
>
>
>
>
>
>-----Original Message-----
>From: Lacey,Scott [mailto:[log in to unmask]]
>Sent: Thursday, August 05, 1999 10:12 AM
>To: [log in to unmask]
>Subject: RE: new legal issues
>
>
>
>Prop 65 sounds like another case of the "technically illiterate" creating
>convoluted laws which burden the productive sector and create more work for
>the bureaucrats. The entire electronics industry is tooled up for lead-tin
>solders. I doubt that the California market is large enough to justify the
>use of lead-free substitutes, and many manufacturers may simply decide not
>to expose themselves to potential future liability - the example of the
>State-financed tobacco megasuits looms large in corporate offices today.
>Massachusetts recently enacted a new victim disarmament law which goes so
>far as to regulate the technical aspects of firearm construction, including
>melting points of alloys and stringent drop test requirements. Many
>manufacturers have simply refused to ship certain firearms into the state,
>including current models of the M1911, which the U.S. military found safe
>and reliable enough to issue in World Wars I and II, Korea, and Vietnam. If
>individual states continue in this vein, either Congress will have to step
>in and deal with liability issues, or many of us will find ourselves living
>in landlocked islands where some technology is simply unobtainable. I
>shudder to think what the legal eagles (or is it vultures?) could find
>objectionable in the typical laser printer. "LASERS! High Voltage! These
>things are too dangerous to be sold to consumers!"
>
>As to the Lemelson patents, and barcodes, I can't help but wonder if he was
>a Patent Attorney by trade? The group is claiming that he invented barcodes,
>cordless phones, cassette players, camcorders, etc. Some years back one of
>the automotive magazines published an interesting story about a Patent
>Attorney named Selden who patented the automobile. He had every auto
>manufacturer in the country paying him royalties, until one by the name of
>Henry Ford decided to fight. In the final stages of the court battle
>plaintiff Selden, who had never built any autos, was challenged to actually
>build a working vehicle according to his patents. The finished vehicle was
>brought to a track where it was to race a production Ford in front of the
>judge. The Selden "auto" never got to race, due to numerous design defects.
>The patents were invalidated, and the auto industry thrived. Will history
>repeat itself?
>
>Scott Lacey
>
>
>
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