Hi Chris,

Some of my work is in customer support for conformal coating products,
amongst other things, and more and more extensively the question asked of me
is 'is your coating material compatible with our no-clean flux?'.

In the past this was a difficult question to answer, and generally I was
able to explain to the customer why the residues they were sealing in caused
effects largely unaffected by which coating material they sealed them in
with!

If the customer is prepared to do some SIR testing to validate their process
with coating included, then they get a better answer, and we have done this
for several customers now.

A significant amount of our customers choose to coat over no-clean residues
without any form of validation. Presumably they then rely upon SIR and other
tests performed by the flux vendor as an assurance of reliability. The
standard SIR test is of course not done with other process materials (such
as a coating) being present.

Best Regards

Alan Brewin - Chief Chemist
Concoat Ltd., Alasan House, Frimley Road,
Camberley, Surrey. UK. GU15 2PL
+44(0)1276 691100  http//www.concoat.co.uk
'Any opinions expressed are not necessarily those of my employer'

-----Original Message-----
From: Chris Evans <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 14 April 1998 17:46
Subject: [TN] Fluxes


>     Hello Technetters
>
>     I have three questions
>
>     1. Which specification are no clean fluxes released to. Do they
>     conform to Def Stan 34-4.? ( I know its not been issued other than in
>     draft form but it gets called up in our work)
>
>     2. Has anyone any information on conformal coating over no-clean flux.
>     Compatability or long term reliability issues ?
>
>     3. How are others going to overcome the new restrictions on rosin flux
>     fume ? Are you using extraction or changing fluxes ??
>
>
>     Any response greatfully received
>
>
>     Thanks
>
>     Chris Evans
>
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