Marvin
        If the resist is over copper and is cured/ dry, we have reasonable
success in measuring thickness with the electronic 'eddy current' devices.
We use the 'Elcometer' range, but I am sure there are others.....
If the resist is wet, you can use a 'wheel' or comb, which are specifically
designed & calibrated show the ink thickness.
There are X-ray techniques to measure dry resist thickness, but I don't know
how much they cost.
Hope some of this helps.

        David Albin
        Coates Circuit Products

-----Original Message-----
From: marvin v. picardal [mailto:[log in to unmask]]
Sent: 03 March 2000 20:21
To: [log in to unmask]
Subject: [TN] THICKNESS MEASUREMENT OF LIQUID RESIST


Dear technetters,

Hi all.  While I am busy performing my evaluation for the
detection & identification of contamination on metal surface,
I have another question.

Is there any other method of measuring thickness of liquid resist on
a surface aside from break test or scraping?  Please help.

Thanks in advance.

Marvin

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