Dave,

If you don't have full knowledge of this report, why would you call it
biased?  Have you read the report?  Have you noticed all of the
manufacturability and reliability studies performed by third parties?
Over $1 million and several months were spent on this study.   

Why would solder manufacturers be biased against higher-silver alloys
when the costs of these are passed on to end users? The study
objectively tested various tin-silver-copper alloys and found minimal
differences between them.  What it comes down to is, why spend more on
silver when it's not needed?  If the study found that a higher silver
alloy showed significantly better results, that alloy would have been
recommended.

So... what is your justification for calling it "biased"? 

Regards,
David Suraski
AIM

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: Monday, August 01, 2005 10:20 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305

Hi Rich, IPC LF Listservers,

I would keep reading beyond this one report.

I would also recommend your own testing for your own conditions and end
uses including reliability. Hopefully you have seen that results on this
LF project have varied depending on researcher/reporter.

It seems to me, without full knowledge, that this is a biased report
based upon the solder producers wanting to standarize with a predominant
solder in the Far East.  Less silver is also cheaper.

One question I have been thinking about asking is:

Do we see or know the data on whom on SPVC disagrees or has
precautionary guidance against this recommendation.


Yours in Engineering, Dave
YiEngr, MA/NY DDave

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