Hmmm... Bev and Brian do you want to weigh in on this?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Russeau
Sent: Thursday, November 03, 2005 3:08 PM
To: [log in to unmask]
Subject: Re: [TN] compressed air
Phil,
What ionic element does alcohol leave on the board surface? I'm not
sure
that I would agree with that statement, especially since alcohol
(isopropyl
to be exact) is defined in many of the IPC specifications for
cleanliness
testing such as: IC (2.3.28); ROSE (2.3.25) and Mod-ROSE (2.3.25.1). I
agree that alcohol is not a good solvent in all cases. Keep in mind
that
the old chemistry premise is that "like dissolves like". In some
instances
it may be okay if used on alcohol based materials. The point being that
you
need to match materials and make darn sure you're getting them
completely
rinsed off.
Best Regards,
Joe Russeau
Process Analyst
Precision Analytical Laboratory, Inc.
4106 Cartwright Dr. Ste. A
Kokomo, IN 46902
P: 765-455-1993
F: 765-455-1996
E: [log in to unmask]
----- Original Message -----
From: "Phil Nutting" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, November 03, 2005 2:44 PM
Subject: Re: [TN] compressed air
> But Ramon, all the experts in this forum have repeatedly stated that
> alcohol is a poor cleaning agent. It desolves any oil, greases or
> fluxes and then redeposits a thin layer everywhere as the alcohol
> evaporates. Oh, and it also leaves an ionic element on the board
> surface.
> The DI water wash is a better solution IMHO.
>
> Phil
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
> Sent: Thursday, November 03, 2005 2:32 PM
> To: [log in to unmask]
> Subject: Re: [TN] compressed air
>
> It would be better in a exhaust hood. To get very clean air, use
> an in line air refrigerant system. They cost around $ 800.00 and are
low
> maintenance. Hook an ESD air gun to blow and you are ready to remove
> those bunnies. I would clean them in alcohol bath with a brush
> afterwards to make sure they are all clean.
> Ramon
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Bloomquist, Ken
> Sent: Thursday, November 03, 2005 11:20 AM
> To: [log in to unmask]
> Subject: Re: [TN] compressed air
>
> Hi Barb,
>
> We do this all the time and depending on how bad it is we either
gently
> blow with an ionized air gun in the return and repair area or if it's
> worse we'll actually take it out on the loading dock and give it a
good
> blast again using an ionized air gun.
>
> If you are not sure about where it's been or what sort of "dust
bunnies"
> are on it you might want to wear a dust mask.
>
> KennyB
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Barbara J. Rich
> Sent: Thursday, November 03, 2005 8:00 AM
> To: [log in to unmask]
> Subject: [TN] compressed air
>
>
>
> I am looking for any information on using compressed air to blow off
> "dust bunnies" on circuit boards coming from the field.
>
>
>
> Barb Rich
>
> Admin. Support Mfg.
>
> Sanmina-Sci
>
> 321 S. Taylor Ave.
>
> 303-264-2009
>
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