Interesting observation. I noticed your first post and don't know the
answer. 
It is an error. I think it belongs in there. I don't ever recall reviewing
the table, to my knowledge, it has simply moved without comment from one
rev. to the next. I suggest that you submit a request to change the
standard.
Perhaps there are other metals that could sneak into the pot and are not
listed, Palladium comes to mind. 
 


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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, March 15, 2007 8:40 AM
To: [log in to unmask]
Subject: [TN] Solder Purity


Good morning,
      A little over a week ago I posed a question regarding solder purity
   and a perception of conflict between J-STD 001 & J-STD 006. Luck was not
   with me as there were no replies. Alas, I will try one more time in
   hopes that the tech gurus here can provide some insight or solutions
   based on similar experience.

   Previous post:

   I am hoping that someone can help us with a clarification regarding
   solder purity/composition requirements. Specifically the following:

   ANSI J STD 006 on page 3 lists allowable impurities in the solder alloy
   when purchased. One component in particular is indium @ 0.10 allowable
   limit.
   However, ANSI J STD 001 which is the assembly specification used in
   daily production lists on page 5 allowable solder impurities which does
   not include/allow Indium.
   ANSI J STD 001 which is also the specification used for testing lists on
   page 5 allowable solder impurities which also does not allow Indium.

   Perhaps we are interpreting the sentence associated with the table on
   both 001 and 003 wrong, however the sentence does state:  "the balance
   of the bath shall be lead and/or the items listed above." How can you
   allow Indium in the raw purchased solder and not allow it in the
   production solder?

   Thank you in advance for your thoughts and clarifications.



Brian Guidi
Senior Product Engineer / N.P.I.
Teledyne Printed Circuit Technology
Tel: (603) 889-6191  X:310
Fax: (603) 886-2977
E-mail: [log in to unmask]

Visit us @ http://www.tetpct.com

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