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June 2010

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 23 Jun 2010 11:46:15 -0500
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It great to be able to be inside the Fab house where simple tools as you stated work great.  I used to do that too once upon a time I a previous life, the other bib blue.   I measure SM on board/planar during the Reliability QUAL process during destructive analysis phase.

It Depends!!  Where one is gathering the measurements.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ken Bloomquist
Sent: Wednesday, June 23, 2010 11:31 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating measurment

Wow, some of you must have really deep pockets, laser, cross section,
digital Keyance, etc. All this to measure what has a tolerance as wide as a
ship, .003 +/- .002!

We use a glass slide with a piece of tape on one side that goes a little
over half way. We do the same on the other side at the opposite end. The
slide is placed in the middle of each tray of boards and follows them for
each coating on each side. It gets sprayed along with all the boards making
it representative of the coating on the boards. We remove the tape from both
sides of the slide and measure the middle where there is no coating. We then
measure each end to get the thickness for each side of the boards. We use a
very good ratcheted micrometer so there is always equal pressure applied to
each measurement.

It works great and is cheap!

KennyB


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jean-François
Bissonnette
Sent: Wednesday, June 23, 2010 8:52 AM
To: [log in to unmask]
Subject: [TN] Conformal Coating measurment

Hi Technetters,

 

What is the proper method for measuring conformal coating thickness?
Were're using a micrometer but I doubt that the method is reliable.  A wet
gauge is not out of the question but we would prefer to measure thickness
once the coating is cured.

 

Thanks!

 

Jean-François Bissonnette

[log in to unmask]

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