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August 2001

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From:
Mike Fenner <[log in to unmask]>
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Date:
Tue, 7 Aug 2001 14:00:22 +0100
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I can't definitely say no, but I am not aware of any studies.  On a
metallurgist's "list of things to look into" I don't think this would ever
get a high rating as the likelihood of producing anything of significance to
report on is pretty low.

Melting points: Sn62 is 179C MP, Sn63 is 183C MP, and 183 -188C MR for Sn60

Mixing all these in some uncontrolled way might extend the pasty range of
the solder mix to say 190C in worst case. Solder joints might have a
slightly duller appearance. It is possible a skilled touch up operator might
be able to detect the pasty range increase.
Extended pasty ranges are generally regarded as undesirable but 10C should
not be a problem.
Why do you  ask, is there a problem or has someone just noted the label on
the touch up spool or ...



Mike Fenner
Indium Corporation of Europe
T: + 44 1908 580 400
F: + 44 1908 580 411
M: + 44 7810 526 317
W: www.indium.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Grant Emandien
Sent: Friday, August 03, 2001 4:07 PM
To: [log in to unmask]
Subject: [TN]


Hi,

Has anyone evaluated the effects of joint reliability (and any other
consequences) of Sn63 and Sn62 solder joints when reworked/mixed with 60/40
solder?

Thanks in advance
Grant


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