Terri,
The answer to your technical question is:
MIL-S-13949/10 (GIN) is now IPC-4101/40   [Polyimide, 200 degree C min Tg]
MIL-S-13949/10 (GIL) is now IPC-4101/41   [Polyimide, 250 degree C min Tg]
MIL-S-13949/10 (GIJ) is now IPC-4101/42   [Polyimide, 200-250 degree C Tg]

I recommend you use the IPC-4101/41 as it is most commonly available and
good stuff.
These are all standard Eglass woven.  The 4101 does not differentiate
between B and C stage, hence the one slash number.  Be careful when using
the Poly in today's complex surface mount, the FR4 has a better peel
strength for small SM lands and high aspect holes in small inner lands run
into tough challenges relative to etchback.

Bill Yac

 -----Original Message-----
From:   Houston, Terri [mailto:[log in to unmask]]
Sent:   Monday, February 18, 2002 2:33 PM
To:     [log in to unmask]
Subject:        [TN] Mil spec translation to IPC needed

Hi folks,

I'm looking for the IPC equivalent for laminate MIL-S-13949/10 type GIN and
prepreg MIL-S13949/13 type PGI materials.

If anyone knows what these materials are currently called in the IPC specs,
it would be greatly appreciated.

Thanks,
Terri

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