Hi Rich - can you provide a bit more specifics on where you are finding 
Ca? In the solder joint, on the soldermask, on the components? And if you 
clean, are you using untreated tap water?

Dave Hillman
Rockwell Collins
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From:   Richard Kraszewski <[log in to unmask]>
To:     <[log in to unmask]>
Date:   02/10/2014 04:09 PM
Subject:        [TN] Risks Associated with Calcium
Sent by:        TechNet <[log in to unmask]>



I am occasionally seeing irritating low levels of calcium in some 
assemblies that we test via ion chromatography.

Some organizations required spec levels as low as <1 ppm.

My questions to you techies is:

#1 Besides wash water are there any other sources of calcium that come to 
mind?

#2 is there any real value in having Calcium specs down as low as 1 ppm? 
(I suspect not and this spec was merely carried over from the 
semiconductor industry where it may have more value)

CH65 is of some help here in that is does speak much more of the evils of 
Na that Ca& Mg, but not as much as I had hoped. 

Thoughts??

Rich  Kraszewski 
Senior Process Engineer
Plexus Engineering Solutions 

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