Michael, Larry,
1- BMS: Boeing Material Specification
2- #8-120: Don't have this one in my personal file but probably is an
application code.
3- Type:  Not real sure but sounds like the style of fiberglass. Could be
seven plies of style 7628 to yield a 0.062" laminate. Various other ways to
make an 0.062 board also.
4- Class: If this is similar to BMS-9-3M, this designates the organic
coupler on the fiberglass used to improve resin wet out, improve moisture
resistance, etc.
5- Specification Source:        The Boeing Company
                                Specification Unit
                                Mail Stop 73-43
                                Orgn  B-504B
                                206-234-2897
        Might try Boeing.com also.
6- Laminate Source: Any of the IPC members who prepreg and laminate for HPL
applications.

Tom Palmer
Technical Service
Hexcel Schwebel
704-878-8324

-----Original Message-----
From:   Larry Campbell [SMTP:[log in to unmask]]
Sent:   Friday, February 12, 1999 6:40 PM
To:     [log in to unmask]
Subject:        [TN] Material Specification -Reply

It's GFN.  Mil-P-13949/4 or the new IPC-4101/2.  The BMS I can't even
guess at.

Larry Campbell
BFGoodrich, Avionics Systems

>>> Mike Zagami <[log in to unmask]> 02/12/99
03:45pm >>>
I have a spec that call for the following material:

     .062 flame retardent glass epoxy board, copper-clad on one or two
sides as required. Mil-P-13949, type 6FN (or BMS 8-120, Type 1, class 4,
Grade A)

    I cannot find info on the "6FN" material. The closest I could find
was "GFN". Is there such a material as 6FN. And also what is the "BMS"
spec?

    Thanks,

--
Michael Zagami
Electrical Engineer
Fairchild Controls Corp.
301-228-3469 (voice)
301-682-6885 (fax)

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