If you are building the boards to either IPC-6013 or MIL-50884, you must
pass the thermal stress test to certify them as compliant.

Rigid, Flex and Rigid/Flex boards can and do regularly pass this test.

You might want to make certain the test lab has baked the samples prior
to thermal stress.  There is a 6 hour minimum bake.

Of course you could have a third party repeat the testing, if you think it
was done improperly.  However to certify boards to those specifications,
you must pass the test

Susan Mansilla
Robisan Laboratory

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