Roxanne

Liquid Photo-Imageable but it could be Laser Photon Impregnation or Linear
Phase Induction or Long Particle Invasion or Lazy People Inquire :-)

Graham Naisbitt
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[log in to unmask]          Concoat Ltd
Tel: +44(0)1276691100           Alasan House, Albany Park
Fax: +44(0)1276691227           Camberley GU15 2PL UK

-----Original Message-----
From:   TechNet  On Behalf Of Tovey, Roxanne L
Sent:   Tuesday, November 11, 1997 11:09 PM
To:     [log in to unmask]
Subject:        Re: [TN] Sealing Vias


Can I ask what is LPI?
Roxanne

> ----------
> From:         [log in to unmask][SMTP:[log in to unmask]]
> Sent:         Tuesday, November 11, 1997 2:41 PM
> To:   [log in to unmask]
> Subject:      [TN] Sealing Vias
>
> Among the ways of sealing vias on LPI solder masked boards are a)
> filling
> the vias with LPI, and b) tenting the vias with dry film solder mask.
>
> We are on the brink of converting from dry film to LPI on all our
> PCB's.  I
> would appreciate any comments on the relative merits/demerits of
> boards
> produced by these two processes.  Our supplier recommends the dry film
> option.
>
> Our boards are sometimes in relatively harsh environments and are
> designed
> to operate from -40 C to +70 C.
>
>
> Thanks to those of you who responded to my inquiry on how to repair
> urethane conformally coated boards which have been contaminated with
> silicone prior to conformal coating.
>
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