http://www.youtube.com/watch?v=8reAZKjKJPk
Acetone and styrofoam or "better" yet gasoline, styrofoam and some detergent
and you have a form of napalm.
But we digress.
Using acetone to clean boards? I think the customer must have been sniffing
the stuff.
Boiling point of 57C
181 mm of Hg vapor pressure at 20C
Flash point of MINUS 20C
Have any of you looked at the MSDS for this stuff? Yeah, yeah, I know
suppliers would make an MSDS for water look scary, but this is a serious
SOLVENT.
And people think heptane with a vapor pressure of 40 mm Hg at 20C is bad?!
Whether people are dunking whole boards in the stuff or putting it on a
Q-tip (repeatedly) (and how often is the Q-tip replaced?)I wouldn't be using
it outside of a bona fide fume hood with proper controls for heat sources
and sparking agents.
And on top of OSHA, what about state and local controls for VOCs?
Bad, bad choice.
Bev
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, February 20, 2014 6:33 PM
To: [log in to unmask]
Subject: Re: [TN] Acetone as a cleaning agent for PCBA's...cool thing you
can do with acetone
Now here's something cool to do with acetone:
http://www.youtube.com/watch?v=h9Jx8NRkWTo
Naw, it won't hurt your boards... :o)
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Tellefsen
Sent: Thursday, February 20, 2014 4:18 PM
To: [log in to unmask]
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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