>From the EMPF HelpLine in Indianapolis.  One possible solution: We have used 
a material called Templaq in the past. It is a liquid in small bottles (like 
typewriter white-out) that you can dot onto various places on an assembly. 
It is available in different colors, each linked to a temperature. When that 
temperature was reached, the material changed from the opaque color to a 
clear dot. I'm not sure what temperatures it is available in now (the 
materials we used were all just below, at and just above eutectic solder 
reflow temperatures.) I just called Nu-Concept Systems, Inc., 2725 Advance 
Lane, PO Box 587, Colmar PA 215-822-8400 fax 215-822-1427, which was my 
previous source, and they still sell it. I don't know if they make it or are 
just distributors, but at least it's one source. You could dot several 
component tops and board areas and get a pretty good idea if you were going 
above certain temps.
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Cc: karl.sauter
Subject: SMT PCA Bd Temp Sticker
Date:  19 Sep 95 11:12AM

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Board profiles are being run where the IR/oven set-points vary
both significantly and often depending upon the variety of new
SMT, TAB, BGA, etc. technologies being used.

Is there a TAPE/STICKER/WAX PENCIL that can be used to indicate
on a functional (non-mole) board the highest temperature that
board has seen during PWB assembly ?

Thanks, 


Karl Sauter 


Staff Engineer, Sun Microsystems, Inc. 


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