Hi Dave,
I'm still here!
The Sb range of CASTIN is normally 0.2 to 0.5% depending upon
customer/geographic preference, though the patent allows for up to 2%.
I don't want to turn this into a commercial (I learned that lesson years
ago!), so suffice it to say that there are benefits to adding Sb in this
concentration to SAC alloys.
Anyone can feel free to contact me for additional information.
Best regards,
David Suraski
AIM
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: Sunday, October 01, 2006 2:02 AM
To: [log in to unmask]
Subject: Re: [LF] Antimony in Lead Free solder pot
Hi Mark, AIM's DavidS, IPC LF Listservers,
Difficult question, I think, yet I will take a first stab at it.
If you are using the alloy that contains Sb, and have reliability data
to support your applications, you would want to stay within the
recommended Sb
(antimony) range that resulted in the reliability approval for your
products. Normally I would expect you are bounded by 0.3 to maybe 0.8. I
am thinking of Castin(R). Cu08Sb05Ag25Sn. I am guessing on the .8. AIM's
David if he is still reading can surely correct me.
The range (by solder pot analysis) for an alloy that purposely contained
Sb
(Antimony) would be much higher than for an alloy that purposely didn't
contain Antimony.
To look for the effects visually by soldering results probably could be
done if Sb really got high in percentage like 2 or 5% or 10% yet by then
your line is shut down. The same thing would happen for high Gold, ,
Most of these tight ranges are established based on the micro structure
of the resultant joints and reliability analysis. It just isn't
practical in most electronics to wait for obvious visual effects.
Yours in Engineering, Dave
YiEngr, MA/NY DDave
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