Karen, white residue are common after acetone wash, especially using touch up localized clean: you basically smear stuff around = acetone evaporate quickly, the small qty not sufficient to carry the small molecule residue away. Try it your self, :-) oil, flux, adhesive, etc. You pick and choose.
"All professional skills are mastered by critiqued practice" - by Schon.
Original Message
From: Karen Tellefsen
Sent: Thursday, February 20, 2014 6:19 PM
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: Re: [TN] Acetone as a cleaning agent for PCBA's
I don't think acetone has white residues, but maybe it attacks the solder
mask giving the appearance of white residue.
I would run a compatibility evaluation of acetone on the PCBA,
particularly the solder mask, before using it as a cleaner.
Karen Tellefsen - Electrical Testing
Alpha / 109 Corporate Blvd./ S. Plainfield, NJ 07080
[log in to unmask]
908-791-3069
From: Robert Kondner <[log in to unmask]>
To: <[log in to unmask]>,
Date: 02/20/2014 01:21 PM
Subject: Re: [TN] Acetone as a cleaning agent for PCBA's
Sent by: TechNet <[log in to unmask]>
Toxic - Yes
Flammable - Yes, May I add explosive vapors too!
But White Residue - No, I think that is wrong. Why do you suggest this?
Any comments on White Residue ? (I almost don't ask this as White
Residues
can be a horror story of a question. The Brian Ellis book covers this
well.)
Bob K.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
Sent: Thursday, February 20, 2014 1:08 PM
To: [log in to unmask]
Subject: Re: [TN] Acetone as a cleaning agent for PCBA's
Hi Bob,
Acetone is toxic, flammable and have white residues.
On Thu, Feb 20, 2014 at 6:59 PM, Robert DeQuattro <
[log in to unmask]> wrote:
> 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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