Homebrew PCBs

In a message dated 5/21/2007 8:38:11 A.M. Central Daylight Time,  
ajsmith@... writes:

Heating is heating, whether it's in a microwave or in your teapot.  


Not so!  The microwave is merely a "radio transmitter"  which is supposed to 
cause slightly-conductive molecules to "jiggle", the  friction thereof causing 
the heat.  This doesn't work well with a  concentrated FeCl solution simply 
because the solution is HIGHLY conductive, so  the first couple mm. of stuff, 
hit by the RF first, SHIELD the rest from this  energy.  This DOES heat that 
couple mm. mightily.  So, the only way to  heat FeCl properly in a microwave is 
ten seconds at the time, and then STIR the  container between each 10 sec. 
nuking.  This DOES mean opening the  door and fiddling with it six to ten times 
to heat up 100 ml. or so, but it is  the ONLY way to prevent boiling of the 
"edges" and poor heating of the "inside"  of the container of stuff.
 
Do NOT do it with a copper board, etched or not, inside the  microwave!  This 
will simply RUIN things!  Just don't do  it!
 
Been there; DONE  that!            Jan  Rowland



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