Message
Siggi,
In a previous life, in the early eighties, I worked for a company where we did very high volumes of CEM1 work.  It's advantage, besides cost, was that it lent itself well to "punch & crunch" where we used dies to cut the board profiles.  It was very easy on the tools where FR series was highly abrasive.  We built high volume single sided GFCI and smoke detector products using both SMT and through hole parts.  We automatically in/onserted and then wave soldered using custom pallets and had very high yields using Universal, Panasonic, and Electrovert equipment.  We bought our boards from Tingstol up in Chicago.  I searched and they're still around, so you might contact them at http://www.tingstol.com/home.htm to see if they still offer those materials. SMT was certainly fun in those days as there was almost no one using it so everything you did was a learning experience. 
 
Here at Nielsen, we buy and dissect dozens of VCR's and set top boxes to figure out how to meter them and I often see what appears to be CEM1 used for these boards so it's still around, or some variant of it.  I seem to remember it also being called PC75, so you may have more success with that name. 
 

Bob Croslin, Nielsen Media Research

 

-----Original Message-----
From: Zweigart, Siegmund [mailto:[log in to unmask]]
Sent: Thursday, April 10, 2003 7:42 AM
To: [log in to unmask]
Subject: [TN] CEM-1

Dear all

As I am not that long in the business, if have a lack in knowledge regarding CEM1- PCB materials.

If I remember right (starting as an electronican 24 years ago) CEM is a paper based PCB material single sided without through hole metallization.

In the internet I cannot find any information about CEM1 (maybe there is some from chines companies, but i Cannot read it).

Is this material still used in high volume somewhere (like in cameras...)

I thick it is still used sometimes in consumer products.

What are the recommendations for assembly and reflow process?

Can somebody forward me more information about CEM1 ... CEM3 or FR 1... FR3?

Thanks for your help

Siggi

 
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