Hi,

 If acetone is removing "Stuff" from the bare PCBs then it sounds like,  by
definition, the PCBs were not clean.

 I think your customer is probably being a little "Anal-Retentive" (I think
that is what Freud called it) but in this case it paid off.

 And doing an ionic test is of no use. If you had a glass, grease or oil
coating on the PCB they might pass an ionic test but they sure will not
solder well.

Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert DeQuattro
Sent: Thursday, February 20, 2014 12:00 PM
To: [log in to unmask]
Subject: [TN] Acetone as a cleaning agent for PCBA's

I have a customer that uses acetone to wipe down their PCBA's upon receipt.
The assemblies we make for them are cleaned using a closed loop aqueous
board washer then sampled for cleanliness with our zero-ion tester per
J-std-001E guidelines.
Recently this customer commented that boards appeared dirty upon cleaning
with the acetone.  Does anyone have any thoughts on this acetone cleaning
process.
Thanks,

Bob

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