Hi Bobby,

You could either use a clear SR1000 soldermask (heat cured) or screen the
numbers using legend ink.  Anyway, Hysol has many products of this type.

Have a good day,

Sharon Polmanteer
Process Engineer

At 08:22 AM 1/28/98 -0500, you wrote:
>Hello Technetters,
>Any suggestions on the following problem would be greatly appreicated.
>
>We are manufacturing/assembling small amounts of custom boards in house
>and are having a
>problem with the ink stamped serial numbers on the board.  We have tried
>several different types of coatings (epoxies, varnishes, etc.) to try
>and protect the ink stampings from coming off.  The
>difficulty that we are having now is that during a cleaning bath in 200
>proof alchol the epoxy is
>peeling off.
>
>Does anybody out there have any suggestions as to what to use to protect
>the ink stampings.
>
>TIA,
>
>
>Bob Ferrell
>NASA
>MM-G1/G3
>Kennedy Space Center, FL.  32899
>407-867-6678
>
>>
>
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