Brian

The answer to most of your questions are that page 19 of IPC4101 has a
list of all the new spec sheets with cross references to the NEMA and
MIL-S-13949 classifications.   For customers that continue to use the
old designations, in most cases we just go ahead and build the board
with what was requested.  The obsolescence of the specification hasn't
erased our memory, at least not yet.  There have been a few instances
where we've had to get clarification on some of the old MIL-S-13949
designations.  For instance, GF/GFG materials have been split into two
spec sheets, one for "high Tg FR4" the other for Epoxy/PPO.

We have worked with some customer's to get the converted over to IPC4101
if they've asked.  We aren't asking anybody to convert over, though we
might start doing so in the future.

> ----------
> From:
> [log in to unmask][SMTP:Brian_L_Guid
> [log in to unmask]]
> Reply To:     TechNet E-Mail
> Forum.;[log in to unmask]
> Sent:         Thursday, November 05, 1998 11:15 AM
> To:   [log in to unmask]
> Subject:      [TN] IPC 4101
>
> To all raw material Guru's,
> The inevitable changeover from Mil-S-13949 to IPC 4101 is upon us.
> With
> this in mind, I have a few questions:
>
> 1.) Does anyone know of any type of matrix that exists which would
> allow us
> to cross reference existing material call-outs from one spec to
> another?
>
> 2.) How are people dealing with the changeover internally? In other
> words,
> what is being done to reflect the changeover on all existing in-house
> documentation (ie: product travellers, batch cards, AS400 etc.)?
>
> 3.) Are the material vendors (as a courtesy) maintaining any type of
> history in regards to Mil-S-13949? If a company submits a requisition
> for a
> material using the "old" Mil-S-13949 call-out, will he/she be forever
> ostracised? Or, are there quick and easy ways to determine the
> IPC-4101
> equiveleant of a Mil-S-13949 call-out?
>
> Thank you very much for any input.
>
> Brian Guidi
> Methods Engineer
> Teledyne Electronic Technologies
>
> I can be contacted off-line for more in depth discussions at:
> [log in to unmask], or 1-603-889-6191 ext: 310
>
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