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September 2001

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Subject:
From:
Mel Parrish <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 Sep 2001 09:42:29 -0700
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Frank
There is no definitive criteria established in the acceptance standard
IPC-A-610 other than the statement that "High temperature solders may have a
dull appearance." The specific alloy you mention has been used like that,
since I was a youngster (that's a while ago) in production of electronic
products.
Other than surface appearance, wetting criteria and contact angles have
remained consistent with other common solders containing lead over the years
with good results.
We are in the process of looking at a new revision for IPC-A-610 (D) and if
you can provide any input, including illustrations and/or test results, we
would be very interested in considering them. The effort will start later
this month.

Bright and shiny went out some time ago (80s) and there was a significant
effort to reflect that in the standards, including the defunct Military
standards. The surface appearance is often a training issue in recognizing a
normal appearance of the alloy used.

On the "lead free" side, some of the alloys that I have worked with have an
improved (shiny) appearance over Tin Lead. So "lead free" may not be an
effective grouping. Maybe something like "other solder alloys".

Mel Parrish
Soldering Technology International
Madison, AL
256 705 5530
256 705 5538 Fax
[log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Frank Parra
Sent: Tuesday, September 04, 2001 7:34 AM
To: [log in to unmask]
Subject: [TN] inspection of Lead Free Solder


With the electronic industry going more and more to lead free solder,
inspection/acceptance criteria on lead free solder has not been defined (or
if it has, I have not run across it yet).  Our company is leaning to
Sn96.3/Ag3.7. I have established internal acceptance criteria but am looking
for some industry criteria to use.  Lead free solder does not have the same
appearance as does tin/lead solder, so the old "shiny and smooth" critera
cannot apply.

Does anyone have any insight as to the criteria that needs to be applied?
Has the inspection/acceptance criteria been reviewed and established?
Is someone meeting and establishing this criteria?  Who from industry is
part of this committee?

Thank you,
Frank Parra
Q.A. Manager
Raltron Electronics

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