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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