Homebrew PCBs

In a message dated 10/30/2003 5:49:43 PM Central Standard Time, 
pminmo@... writes:
No, noway am I using my microwave. 
Phil:  If you use a good Pyrex container, you CAN microwave it, but you gotta 
"know" how that works:  The stuff is VERY electrically-conductive.  Thus, the 
first few mm of it act as an EMI shield to the rest, so the ONLY part that 
gets hot is the "outer surface of the liquid in the container".  Thus, you gotta 
either stop and stir it every 15 seconds, or have a "liquid tumbler", if you 
can build such!  It is much faster to microwave it like this, even WITH all 
the start/stopping, than heating it over a stove-burner.  Just don't try to heat 
it in the microwave for a full minute, full-blast, as the surface and 
container in contact therewith will get VERY hot, while the rest remains cool for a 
moment.  Thus, if the container is not very good, it will melt if plastic, or 
bust if glass (not Pyrex type glass, anyway)!  

Be carerful!  This is NASTY stuff, and will turn ANYTHING it touches (except 
green FR-4, etc.) yellow!  Including fingers!

Jan Rowland


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