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April 2003

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Tue, 29 Apr 2003 08:22:01 +0800
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Scottish Mountain Dew! - God, I miss that stuff, taken in its natural
environment!

Peter



Geoff Layhe <[log in to unmask]> 29/04/2003 12:12 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Geoff Layhe

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: Re: [TN] PCB Material Question








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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