One other precaution you need to be aware of if you're going to "blast" an
assembled board is ESD. You can generate a static charge with the blasting
and any sensitive components need to be protected.

Mary Muller
ELDEC Corp.

> ----------
> From:         Blomberg, Rainer (FL51)[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Blomberg, Rainer (FL51)
> Sent:         Monday, April 17, 2000 8:09 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Roughing up a board
>
> 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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