Jason,

We do what Bill is suggesting but we also process a glass coupon in the
middle of each batch of boards we coat. It gets coated right along with all
the assemblies. After the coating is cured we cut the coating off the glass
and measure it. It's seems to be pretty representative of the coating that
is on the boards.

Hope this helps,

Ken Bloomquist
PRIMEX Aerospace Company


At 07:34 AM 2/23/00 -0500, Kasprzak, Bill (esd) USX wrote:
>Jason:
>
>A very inexpensive way of measuring coating thickness can be done using a
>tool called a "wet film gauge". Once the viscosity of your coating
>formulation is established, typically verified with a Zahn cup, coat your
>board or sample and measure the thickness of the "wet"coating with the
>gauge. Allow the sample to dry, then re-measure the coating thickness with a
>micrometer. You should end up with a conversion table for your own coating
>which will basically show that when you spray 8 mils thick wet, you'll end
>up with 5 mils dry. The advantage to this method is that you can determine
>while coating your board whether or not you'll have adequate coating when
>finished. The use of an instrument to determine coating thickness after the
>coating is dry and cured may be too late too add or subtract coating from
>the board that you are spraying.
>
>Bill Kasprzak
>Moog Inc.
>
>> -----Original Message-----
>> From: Jason Gregory [SMTP:[log in to unmask]]
>> Sent: Tuesday, February 22, 2000 3:05 PM
>> To:   [log in to unmask]
>> Subject:      [TN] Conformal Coating Thickness Gauge
>>
>> Hello everyone,
>>
>> Can anyone direct me to the best way (or inspection equipment) to inspect
>> the thickness on conformal coatings? TIA.
>>
>> Jason Gregory
>> Production Manager
>> Electrospec
>> (713)784-4900
>> (713)784-1194 fax
>>
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