One downside of Ag plated wire is corrosion. If you had precut jumpers then these will corrode over time lessening or preventing
wetting.

I considered using Ag PTFE wire for rebreather* electronics construction a few years back but decided against it on grounds of
corrosion. Good old SnPb plated wire works best!

* Bit like an aqualung but without the bubbles (at least until ascent). Very useful if you want to dive heliox and mainly do
long duration cave dives.

Best Regards

David Greig
______________________________
GigaDyne Ltd
Buchan House
Carnegie Campus
Dunfermline KY11 8PL
United Kingdom
t: +44 (0)1383 624 975
www.gigadyne.co.uk
______________________________

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert
Sent: 11 March 2006 18:22
To: [log in to unmask]
Subject: Re: [TN] Jumper Wires

March 11, 2006

We also have used stranded silver coated wire for years with no known problem.  Last year, I tried to convince the IPC folks
responsible for IPC 7711/7721 to either delete their statement in the document not to use silver coated wire, or otherwise
provide the technical basis for the statement.  They did not provide any info and left the caution in the IPC document.

I could not open the hyperlink address you gave in the e-mail.  Can you please e-mail me the article?

[log in to unmask]<mailto:[log in to unmask]>

  ----- Original Message -----
  From: Blomberg, Rainer (FL51)<mailto:[log in to unmask]>
  To: [log in to unmask]<mailto:[log in to unmask]>
  Sent: Friday, March 10, 2006 8:03 AM
  Subject: Re: [TN] Jumper Wires


  I'm not sure what being lead-free has to do with corrosion, but here in
  the Space Product business virtually all of our hard wiring and cabling
  consists of silver plated copper wire.  It's been that way for 40 years
  and we have never seen or heard of any corrosion issue.  We also use
  solid wire with the same reliable results.  The only corrosion that I
  have ever heard of was called "Red Plague" in the early 1960's and was
  the result of fractures in too thin silver plating.  A galvanic reaction
  was set up between copper and silver at the fracture line that slowly
  consumed the copper.  This was resolved by the wire industry by
  increasing the thickness of silver plating.  This corrosion is extremely
  rare!  Here is a link to a report on the subject.

http://nepp.nasa.gov/docuploads/97164203-A4FB-479A-A075C918D51DD81E/ESA%<http://nepp.nasa.gov/docuploads/97164203-A4FB-479A-A075
C918D51DD81E/ESA>
  20Red%20Plague.pdf


  > Rainer G. Blomberg
  > Honeywell -Space Systems Clearwater
  > Staff Production Engineer
  (727) 539-5534


  -----Original Message-----
  From: TechNet [mailto:[log in to unmask]] On Behalf Of Vargas, Stephen M
  Sent: Thursday, March 09, 2006 10:11 AM
  To: [log in to unmask]<mailto:[log in to unmask]>
  Subject: [TN] Jumper Wires

  All:



       We need to add a 30 AWG jumper wire to a lead-free assembly (Class
  II). IPC-A-610 says that silver plated stranded wire should not be used
  due to possible corrosion under certain conditions. Our thoughts are
  that this (corrosion possibility) is unique to stranded wire. Would
  silver plated solid wire be an alternative? Any input would be
  appreciated. Thanks.



  Regards,

  Steve Vargas

  Sr. Mfg. Engineer

  Polaris Contract Mfg. Inc.

  [log in to unmask]<mailto:[log in to unmask]>

  508-748-3399 ext.192




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