I am probably
not alone in feeling twitchy about this, if the solvent you are using does not
run off the board then really you haven't removed anything, but dispersed
it so you or your customer can't see it.
I suppose you
could say it has been absorbed by the pen, but If it has been absorbed by the
pen it is just put back down in increasing concentrations each time you use the
pen....
Or you could
argue that as the assembly works the residues must be dispersed enough so
that the amount per area is below some critical point and therefore no
longer a hazard.
I suppose if
the customer specifies it and/or is happy with product reliability then it
is OK, but I still feel twitchy.
Regards
Mike Fenner
Applications
Engineer, European Operations
Indium Corporation
T: +
44 1908 580 400
M: + 44 7810 526 317
F: +
44 1908 580 411
E: [log in to unmask]
W:
www.indium.com
Pb-free:
www.Pb-Free.com
Jim,
Sorry for not explaining. The Pad
Prep Pen is used for rework, particularly with our hot air rework station.
When removing the component, flux is applied to the leads. After
component removal, the flux residues are then cleaned off the pads, to prepare
the pads for soldering the new component to the board.
Howard Watson
SMT Manufacturing
Engineer
AMETEK/Dixson
Howard:
I can't help asking: why do you remove no clean flux
residues?
Jim Smith
Managing Director
Electronics Manufacturing
Sciences, Inc.
4285 45th St. S.
St. Petersburg, FL 33711-4431
Tel:
(727)866-6502 ext. 21
Fax: (727)867-7890
eMail: [log in to unmask]
Howard Watson wrote:
Jim,
Interesting that you ask, as I was just in the
process of ordering some more of the pens that we use, which is called a "Pad
Prep Pen", made by A.P.E. , P/N is 8200-1350, 8 for $89. I don't have
experience with any others, so I won't place judgement. However, our
operators love this one for removing our no-clean flux residue.
Howard Watson
SMT Manufacturing
Engineer
AMETEK/Dixson
Good afternoon,
I
was informed by my purchasing department that Multicore (part # MC-PV-01) is no
longer making their Mini-cleaner (prozone pen), that we were using to remove
flux residue from hand soldered applications. We have received a sample
from a different supplier that is supposed to do the same thing, the only
problem is the pen leaks severely when you push on the tip. This may be a
bad sample, but we are not off to a good start trying to find a replacement.
Does anyone else out there use these types of pens to remove flux residue
from hand soldering or similar applications? If so, what manufacturer do
you use and how do the pens perform? You can email me off-line if you
like.
Thanks,
Jim West
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