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October 2004

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Subject:
From:
Charles Caswell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Charles Caswell <[log in to unmask]>
Date:
Tue, 5 Oct 2004 08:32:55 -0500
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Several years ago I was asked about this. At the time I couldn't find
anything, but the person who was asking finally settled on white spray paint.
Seemed to work for him.

-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]] 
Sent: Friday, October 01, 2004 6:19 AM
To: [log in to unmask]
Subject: Re: [TN] Coating to protect IP

I'm sure you can find some conformal coatings that would meet these
requirements. Many, many, years ago, I sold a two-part flexibilised
(essential) solventless (also essential, or with a reactive solvent)
epoxy that was made exactly for this purpose. I can't even remember the
maker (USA), as senility sets in. It was a low-viscosity dip or spray
product with a 12 hr open time and required, if I remember correctly, a
2 hour cure at about 100 deg C. I do remember the maker said there was
no carbon pigment in it, it was just a heavy dosage of reactive dye.
Maybe Googling will find something?

Brian

Peter Swanson wrote:

> I am looking for ideas for a pcb assembly coating, the function of which is
> to hide the component IDs to prevent piracy and copying. This is a
> non-specific requirement which comes up from time to time.
>
> Basic requirements:
> 1) Opaque - black, but could be any colour I guess
> 2) Fairly permanent and resistant to tampering - leads me to an epoxy type?
> Anything can be removed if you try hard enough, but epoxy would be the
> toughest
> 3) Easily applied, no special equipment - aerosol can? Brush on with fast
> (thermal cure)? Single part?
>
> There's some other factors which would be specific to particular assemblies
> (thermal and electrical characteristics) of course, but I'm just looking
for
> something generic at the moment.
>
> Anyone have any ideas or already use something for this purpose?
> TIA,
> Peter
> --
> --------------------------------------------------------
> Peter Swanson           [log in to unmask]
> INTERTRONICS               http://www.intertronics.co.uk
> Tel: +44 1865 842842                Oxfordshire, England
> INTERTRONICS is dedicated to providing quality material,
> consumable and equipment solutions to high technology
> assembly industries, with the highest levels of technical
> support and customer service.
>
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