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Subject:	Re: Roughing up a board
From:	"Blomberg, Rainer (FL51)" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Mon, 17 Apr 2000 11:09:20 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (61 lines)

As cleaning preparation for some of our bonding and coating operations, we
have used a "soda blaster" using graded sodium bicarbonate (baking soda).
This is not as aggressive (safer) and has the benefit of not embedding and
dissolving totally in water.  It is used in the same type of equipment as
the aluminum oxide blaster.

R. G. Blomberg
Honeywell - Space Systems
Staff Production Engineer
(727) 539-5534 voice
727-539-4469 Fax
[log in to unmask]



-----Original Message-----
From: Phil Crepeau [mailto:[log in to unmask]]
Sent: Monday, April 17, 2000 10:42 AM
To: [log in to unmask]
Subject: Re: [TN] Roughing up a board


hi,

just a word of caution about grit blasting the pwb with alumina.  if there
is any tin-lead plating (or equivalent) present, there is a strong chance
that the grit will become embedded in it.  it has been my experience that
the grit will be very, very difficult to remove.

phil

-----Original Message-----
From: Mark Mazzoli [mailto:[log in to unmask]]
Sent: Friday, April 14, 2000 3:36 PM
To: [log in to unmask]
Subject: Re: [TN] Roughing up a board


Hi Jason,

You might try having them processed through an aluminum oxide blaster.  I
don't know about the documentation part of your question but I think you'll
find that a high-pressure media sprayer, like aluminum oxide or whatever,
will "matte" the surface without removing copper or damaging any feature.

Mark Mazzoli

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