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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