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January 2002

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Subject:
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 28 Jan 2002 17:48:50 -0700
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Jim,

You have chemically altered the polymer. It will no longer perform it's designed function.

David A. Douthit
Manager
LoCan LLC

"Marsico, James" wrote:

> Help!  Emergency!
>
> We have a completed assembly (top assembly with many boards, hybrids, etc.)
> ready for shipment to our customer (space product).  The last operation was
> to ink mark a S/N.  The ink is cured at 150 F for 2 hours.  The assembly was
> put in an oven at 150 C for two hours.  After hours of reviewing all of the
> materials and bill of material, component by component (component data,
> supplier phone calls, etc.), the only item that is not rated for 150 C is
> the polyurethane conformal coating, which turned yellow/brown in color.  Can
> anyone explain what actually happened to the coating and if it can be used
> as is?
>
> Thanks,
>
> Jim Marsico
> Senior Engineer
> Production Engineering
> EDO Electronics Systems Group
> [log in to unmask] <mailto:[log in to unmask]>
> 631-595-5879
>
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