Collins:
                Nordson has a tool that looks like a comb, except that this
comb is as if four combs were joint together forming a square..  The end
teeth are at the same height and the middle ones are at an incline. It is
used when the CC  has just been deposited.  The wet thickness is obtained
right away by pressing the comb on the CC and obseving the indentations on
the surface of the CC.. This wet thickness is translated to about a third in
dry CC  depending on what is the percentage of solids in the spray. I agree
making thickness measurements of the board three times to obtain the CC
thickness is a time consuming process. Specially since there is a need to
obtaine several reading each time to obtain an average because the boards
are not of even thickness.
        Regards,
        Ramon

> -----Original Message-----
> From: Collins Graham [SMTP:[log in to unmask]]
> Sent: Tuesday, September 16, 2003 3:02 PM
> To:   [log in to unmask]
> Subject:      [TN] measuring the thickness of cured conformal coating
>
> Hello TechNet!
> I've got a question for the conformal coaters out there.
>
> Our situation:  We currently measure CCA thickness before application,
> and then again after application & cure of conformal coating, to
> determine how thick a coating we have applied.  We are currently using a
> micrometer to measure the thickness.  Our coating thickness is in the
> 0.001" to 0.005" range.
>
> My question is: what are others using to do this sort of measurement?
> Are there are better tools out there to do this faster / better?
>
> Thanks!
>
> regards,
>
> Graham Collins
> Process Engineer,
> Northrop Grumman Canada Corporation
> Halifax
> (902) 873-2000 ext 6215
>
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