In my last job I tried to do something similar w.r.t. PWB materials for
applications where V-1 or better materials aren’t any good because the
retardants result in reduced service lives in hostile equipment environments,
whereas some specific (and very special!) HB materials last much longer.
A PWB with lots of copper will pass the 94V-1 or 94V-0 tests even if the base
material is 94HB! The copper acts as a heat-sink and prevents oxygen from
mixing with evolved gasses from the epoxy. Test in place (vertical or
horizontal).
Rich
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