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February 1999

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Subject:
From:
Jerome Schwartz x5474 <[log in to unmask]>
Reply To:
Jerome Schwartz x5474 <[log in to unmask]>
Date:
Wed, 24 Feb 1999 12:54:03 -0500
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Carlone,

MIL-P-13949 went obsolete as of Nov. 30 1998. The replacement is IPC-4101.
Also GFN is FR4.


> Approved-By: [log in to unmask]
> MIME-Version: 1.0
> Date: Wed, 24 Feb 1999 12:31:25 -0500
> From: Carlone Anthony C NPRI <[log in to unmask]>
> Subject: [TN] FR4 PWB Material
> To: [log in to unmask]
>
> Hello there, IPC/IPC Members!
>
> I work for the Naval Undersea Warfare Center (NUWC) in Newport, RI.  My job
> function involves the manufacture and acquisition of MK 48 ADCAP Torpedoes.
>
>
> We're having failure problems with PWB's whose master dwgs specify core
> material and prepreg material per MIL-P-13949, slash sheets 4 and 12.
> Specifically, the dwgs require core material of GFN and prepreg material of
> PGFN.  However, the PWB supplier made the boards of "FR4" material.
>
> So, with that background, would somebody out there in the IPC world please
> answer a couple of questions for us:
>
> 1. What is FR4, and what is the parent spec that addresses or controls it?
>
> 2. Are there any commercial (IPC or somebody else's) and/or military
> performance specs that directly correlate with or directly substitute for
> MIL-P-13949 slash sheets 4 and 12?
>
> Any help or guidance you can give us would be greatly appreciated!
>
> Thanks!!
>
> Tony Carlone
> e-mail: [log in to unmask]
>
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                Regards,

                Jerry Schwartz, CID
                IPC Certified Interconnect Designer
                "May the Schwartz be with you"

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