We have a qualified product based on using GBN board material per
MIL-P-13949.   Upon investigating IPC-4101 I notice that /22 is NEMA
G-11 - GB (no reference to 13949) and that /21 is MIL-S-13949/04 -
GF/GFN/GFK.  The issue I have is that GB has a much higher temperature
range than GF.

My question is what is the current material spec that corresponds to
the original 13949 GBN?

Thank you for your assistance.

Regards,
Jim

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