GOOD MORNING TO ALL !           I NEED HELP!!

WILL THE REAL FR-4 and FR-5  PLEASE STAND UP?

        With the new IPC-4101 specs, how do you find the real spec sheet
number?

I am trying to relate the MIL spec to this IPC spec to 2 separate classes -
        old MIL 13949/04 - FR-4 to GF and
      MIL 13949/04 - FR-4 to GFG,

   and    old MIL 13949/05 - FR-5 to GH and/or GHG.

There are several spec sheets that reference NEMA FR-4, MIL 13949/04 with
varying glass transition temps, and resins systems.   How does one decipher
this?  Which resin is used for what?

Is IPC-4101/21 the base generic FR-4 (GF) spec?   or is it  /24,  or is it
/25,  or is it  /26 ?

IPC-4101/23 seems obvious as the FR-5 (GH) spec., but what about GHG?

Thanks,
John

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