Marvin,

A simple test for cleanliness is what we call the "water break free" test.
Apply D.I. water to the surface to be tested and observe how well the water
wets the surface.  It should flow out, onto the surface and not bead up
(like on a waxed surface).  As the water flows off the surface, when the
sample is held vertical, it should sheet off in a thin film and not bead on
the surface for 5-10 seconds.  Another method is to apply a few drops to the
horizontally held surface and judge the angle the meniscus makes.  The
cleaner the surface, the shallower the angle.  As for identifying the
contamination, we typically use SEM and IR Spectroscopy.
Hope this helps.

-----Rainer Blomberg

-----Original Message-----
From: marvin v. picardal [mailto:[log in to unmask]]
Sent: Wednesday, March 01, 2000 6:34 AM
To: [log in to unmask]
Subject: [TN] How to detect contamination on metal surface


Dear Techneters,

I would like to ask some information as to
how to detect contamination on metal surface and
how do I determine what type of contamination that is.
The said contamination results to poor adhesion
between the glue and the metal surface.

I do hope you would take time in helping me out with this.
Thank you in advance.

Marvin

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