Good morning Rich,

You may find these related to the plastic bags used for the extractions. I 
have had occasion in the past to do extractions in the bags and also 
extraction in glass/Pyrex beakers.  I see acetate and formate in the bag 
samples and not in the beaker samples, but higher sodium in the beaker 
samples and not in the bag samples. 

Of course, your facilities could be infested with Acetate Gnomes.

Doug Pauls



From:   Richard Kraszewski <[log in to unmask]>
To:     <[log in to unmask]>
Date:   09/11/2012 11:12 AM
Subject:        [TN] Source of IC Contamination Species
Sent by:        TechNet <[log in to unmask]>



Occasionally, IC analyses are reported to have elevated levels of acetates 
and formates.   Is it the general consensus that source of these 
contamination is assumed to be the decomposition of larger molecular 
weight weak organic acids found in soldering fluxes?  I can't imagine that 
any manufacturer would actually be placing acetic or formic acids directly 
into a flux formulation. These are much too volatile and aggressive. 

Thoughts?

Rich  Kraszewski 
Senior Process Engineer
PLEXUS 
 


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