Welcome back Charlie -
I agree 100% with Brian's words of caution, and would add a few of my own,
particularly if you have adhesives, sealants or conformal coatings to be
applied following assembly:
Verify the compatibility of each of these materials thru the entire
environmental range that your product must be subjected to. I have
encountered some situations where the compatibility of the residues and the
coatings becomes a major problem, resulting in vessication and other messy
situations.
Regards - Kelly
-----Original Message-----
From: Brian Ellis <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Monday, February 21, 2000 9:19 AM
Subject: Re: [TN] THANKS and no clean info request
>Charlie
>
>Welcome back.
>
>I'm sure several responses may help you but, before you short-circuit
>all evaluation, please remember the two basic facts:
>
>1. Water-soluble chemistry gives you the widest operating window
>2. "No-clean" chemistry gives you a narrow operating window.
>
>This means that it is really impossible to just switch, as there are so
>many parameters to consider, e.g. solderability of boards and
>components, desired reliability of end product etc., etc., etc. Another
>point that it is important to realise: the term "no-clean" covers a
>multitude of sins and the easiest "no-clean" fluxes/pastes to use are
>those which are the most active and may leave the most active residues,
>causing future problems.
>
>I would therefore counsel caution in interpreting the responses to your
>enquiry. Caveat emptor.
>
>Brian
>
>Charles Barker wrote:
>>
>> Hello Technetters;
>>
>> As Steve Gregory let slip last week, I am back on the job. I'm somewhat
>> inundated with catching up, so I had not checked back in on TechNet right
away.
>>
>> MANY THANKS for all the prayers and good wishes. They were felt and very
much
>> appreciated by both my wife and me. I still have a good bit or soreness
from the
>> trauma of the surgery, but in general, I feel very good.
>>
>> Now back to the work/no clean thing:
>>
>> I am asking a BIGGG favor!
>>
>> I need to take a serious look at switching our process from a water
soluble flux
>> soldering operation to a no clean one. Normally, I would put several
cored wire
>> solders, liquid fluxes and solder pastes through a rigorous evaluation
process.
>> That could be considered re-inventing the wheel, since many of you have
probably
>> already done that.
>>
>> If any of you have done this and could share the results (OFF-LINE, of
course),
>> I would be greatly obliged.
>>
>> I would like to know which brands, which model numbers, which alloys and
under
>> what conditions they were tested, as well, of course, as the results.
>>
>> THANKS A BUNCH!!!
>>
>> Charlie B.
>> [log in to unmask]
>>
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>--
>Brian Ellis
>Protonique SA
>PO Box 78
>CH-1032 Romanel-sur-Lausanne, Switzerland
>Voice: +41 21-648 23 34 Fax: +41 21-648 24 11
>E-mail: [log in to unmask]
>URL: Technical and consultancy divisions:
> http://www.protonique.com
> Web services division:
> http://www.protonique.com/webserv
>
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>847-509-9700 ext.5365
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