As a follow on to your comment Alain to hole wall roughness.

I have seen customers reject boards for hole wall roughness. Using desmear
for cleaning after drill leaves a jagged surface of glass fibers when seen
in cross-section. Plating to it is fine but it put doubts of hole wall
strength in the customers view.

As there are no IPC Standards for determining the roughness of a hole wall,
can a customer reject a board simply based on a unilateral perception that
the hole "looks rough".

Is there a specification outside of IPC that is available for this issue.
Would appreciate your thoughts.

Charles McMahon



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Alain Savard
Sent: Thursday, August 03, 2000 7:09 AM
To: [log in to unmask]
Subject: Re: [TN] Hole wall roughness


Hi Shirley,

You could always verify for drilled hole diameter, wicking and nodules with
a microsection. Of course this works best after plating and can be inspected
as per IPC-6012 and IPC-600. You will also get a general idea of the
roughness just by looking at it still on a microsection, this can be checked
on the section prior to plating, but there are no IPC standards for it.

P.S. Wicking is best seen on a non-metallographic microscope wit a good
depth of field.

Hope this helps,

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]

-----Original Message-----
From: Shirley Xiao [mailto:[log in to unmask]]
Sent: August 3, 2000 5:32 AM
To: [log in to unmask]
Subject: [TN] Hole wall roughness

  Is there anyone knows how to measure hole wall
roughness after drilling or after plating? (Notes:I've
searched TechNet archive but there is nothing about
hole wall roughness.)

  Thanks and best regards
  Shirley

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