Hi Ed - you also should have listed the link to the paper you wrote up 
which is an excellent read and includes the embrittlement calculation 
equations. I have my co-ops read the paper as an introduction to the 
topic.

http://www.semlab.com/goldembrittlementofsolderjoints.pdf

Dave Hillman
Rockwell Collins
[log in to unmask]



From:   Ed Hare <[log in to unmask]>
To:     <[log in to unmask]>
Date:   03/27/2014 10:22 AM
Subject:        Re: [TN] Calculate percent gold, by weight or volume?
Sent by:        TechNet <[log in to unmask]>



Guy,

The accepted limits range from 3 - 5 wt% gold in the solder, so one must
calculate by weight, not volume.

Ed Hare
VP SEM Lab, Inc.
www.semlab.com


On Thu, Mar 27, 2014 at 8:06 AM, Guy Ramsey <[log in to unmask]> wrote:

> When determining the percent gold in a solder connection, should one
> calculate using volume or weight?
>
> I always did this by calculating the volume of the solder and the volume 
of
> the gold by thickness. Thinking that solder and gold were similar in
> density. eeaAhh, yeah, NO.  11 oz/cuin. Versus 5 oz.
>
> So, there is a big difference between calculating by weight and 
calculating
> by volume. Which way is right?
>
> Guy
>
>
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-- 
Ed Hare
gmail - [log in to unmask]
gvoice - 360-453-7550


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