Seems awful high (20 ug/in2?) for an acetate from the bag.  You may be 
seeing a front end eluter coming out at the same time as formate, leading 
to the high numbers.  You would either have to use a different method to 
check, or use a different analytical approach, such as FTIR to check.

Doug Pauls



From:   Richard Kraszewski <[log in to unmask]>
To:     <[log in to unmask]>
Date:   09/11/2012 11:33 AM
Subject:        Re: [TN] Source of IC Contamination Species
Sent by:        TechNet <[log in to unmask]>



I am speaking pretty generally. Sometimes I see them get reported other 
times not (ND). 

For an example WOA levels may be~ 10 ugm/in2 whereas formate acetates 
maybe twice that level. 

Extraction would be your typical IPA/H2O in a sealed bag floated on a 
water bath for 1 hour. 
 

Rich Kraszewski
(920)969-6075
-----Original Message-----
From: Joyce Koo [mailto:[log in to unmask]] 
Sent: Tuesday, September 11, 2012 11:21 AM
To: 'TechNet E-Mail Forum'; Richard Kraszewski
Subject: RE: Source of IC Contamination Species

Where you found those?  Extracted at high temperature overnight? What else 
on the board? 

Joyce Koo
Materials Researcher - Materials Interconnect Lab
Research In Motion Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: Tuesday, September 11, 2012 12:10 PM
To: [log in to unmask]
Subject: [TN] Source of IC Contamination Species

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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