Thanks, Peter.
The test portion is without doubt, quite convincing. Aesthetics could be a
problem if you have extensive mods - I agree. We were building Avionics,
too - Weather Radars, Omega Navigation Systems and Ground Proximity Warning
Systems.
Regards,
Lakshmi
----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 15, 2003 8:30 PM
Subject: Re: [TN] Con Coat Stripper masking materials
> Hi, Lakshmi,
>
> Several diverse reasons:
>
> 1. to carry out major mods, ensure the boards are properly clean and leave
> the board looking aesthetically clean again afterwards.
> 2. to carry out ICT (In-Circuit Testing) on the board. When you have 2000
> test points on a board, you can't mask them against coating and if you
need
> to test the board again after coating (field failure, mod programme, etc)
> you have to remove the coating to allow the test jigs to make proper
> contact. It's more straight-forward than trying to locally clean all those
> test points.
> 3. after a number of local mods or repairs, the coating looks pretty rough
> and there's a good chance that it's no longer as effective as it should
be,
> so for aesthetic reasons again, but mainly to ensure adequate coating
> performance and the minimum of entrapped residues, we strip and re-coat
> boards.
>
> Our product is class 3, Avionics, so has to be always as good as we can
get
> it.
>
> Peter
>
>
>
> Lakshmi Dwivedula <[log in to unmask]> 15/04/2003 07:36 PM
> Sent by: TechNet <[log in to unmask]>
>
> Please respond to "TechNet E-Mail Forum."; Please respond to Lakshmi
> Dwivedula
>
> To: [log in to unmask]
> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
> Subject: Re: [TN] Con Coat Stripper masking materials
>
>
>
>
>
>
>
>
> One of the reasons that Acrylic based Humiseal IB31 became popular
(against
> its polyurethane material) is because of its ability to allow rework
> without stripping. Why do you need to strip the coat? You can perform the
> modifications, (clean the soldering iron tip) and spot recoat with a brush
> under a UV Light.
> Regards,
>
> Lakshmi Dwivedula
>
> (978) 256 6214
>
> Mail to: [log in to unmask]
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