This is not to overlook the FR4 Tan Laminate made many years ago ---- Maybe
still made on East Coast.
Bernie Kessler





At 05:12 PM 04/28/2003 +0100, you wrote:
>Carl,
>
>The tan laminate is more than likely to be either FR2 or FR3. Both are paper
>based, FR2 is phenolic resin, Fr3 is epoxy resin. The IPC references are:-
>FR2 = IPC 4101/03.                FR3 = IPC 4101/04.
>
>BTW Doug,
>CEM1&3 aren't cyanate ester laminates. CEM 1 is a paper core with a woven
>glass surface bonded with phenolic resin.
>CEM3 is is a non-woven glass core with a woven glass surface bonded with
>epoxy resin.
>
>OK class over for the day. Time to get some Scottish Mountain Dew.
>
>Geoff Layhe
>
>
>
>
>-----Original Message-----
>From: [log in to unmask] [mailto:[log in to unmask]]
>Sent: Friday, April 25, 2003 4:40 PM
>To: [log in to unmask]
>Subject: Re: [TN] PCB Material Question
>
>
>Carl, the tan material you see is probably CEM-1 or CEM-3.  CEM stands for
>Cyanate Ester - Modified.  It is a low cost laminate that is more often
>punched than routed, and usually single sided.  Never used in Class 3
>electronics (at least by smart people).  Usually only class 1 stuff.
>
>?
>
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Bernard Kessler & Associates, Ltd
714-898-8422  562-598-5563  Fx: 562-431-1741
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