Syd --
Why not let your solder supplier recommend proper flux removal procedures???
After all, that _is_ their business.
I am sure that you will hear of many "home" remedies for this problem. I
consider straight alcohol one of the worst. All it does is disolve and
dilute the flux and smear it all over the board. It only makes the mess
worse.
I have, for many years, used Kester-44 solder exclusively with excellent
results. Kester recommends that defluxing that solder is "optional". It
seems that in your special case it may be necessary. Kester then recommends
their "Bio-Kleen Sopanifier Concentrate" for de-fluxing K-44. My procedure
for batch work is then to mix Bio-Kleen with (very) hot water at a
concentration of about 2-4% by volume in a Pyrex dish of adaquate volume.
The boards are allowed to soak for about 15 minutes and then lightly
scribbed with a bristle brush (I use an ordinary paint brush with the
bristles cut down to about 1" long to make them a bit stiffer) and then
allowed to soak another 15 minutes. After this the flux remover is poured
off and the boards are rinsed for 10-15 minutes in hot running water and
then oven dried at about 180 to 200 deg F. (Be sure that all parts on the
boards will withstand this temperature.)
I wear latex rubber gloves throughout this procedure.
I have talked to assembly houses that use Bio-Kleen in commercial
dish-washers for volume cleaning.
Oh, a tip - Kester will happily ship you a quart sample of Bio-Kleen at no
charge, but they will ask you to pay the shipping. Be _very_ careful,
shipping will be via Fed Ex, special handling for hazardous materials, and
will set you back about $95.00. I am now looking for a local supplier of
Kester materials.
Best wishes, Bob Smith
--- Avoid computer viruses, Practice safe hex ---
-- Specializing in small, cost effective
embedded control systems --
http://www.smithmachineworks.com/embedprod.html
Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
[EMAIL PROTECTED]
----- Original Message -----
To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
Sent: Friday, February 28, 2003 8:09 AM
> I am working on a high voltage shunt regulator design where contamination
on
> the circuit board is causing problems. What is the best way to scrub or
> rinse all or most of the ionic contamination off a circuit board? I
usually
> use denatured alcohol to remove flux residue, but that is not good enough
in
> this case. Any suggestions or wisdom would be much appreciated.
>
> Here is a link to the Data Sheet on the little project:
> www.logwell.com/products/Codatron.PDF
>
> Syd H. Levine
> AnaLog Services, Inc.
> Phone: 270-276-5671
> Telefax: 270-276-5588
> E-mail: [EMAIL PROTECTED]
> URL: www.logwell.com
>
>
> --
> Author: Syd Levine \(AnaLog\)
> INET: [EMAIL PROTECTED]
>
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--
Author: Robert Smith
INET: [EMAIL PROTECTED]
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