Re: [TCML] TAR

[Sfxneon@xxxxxxx]

Hi Ed,
 
The black stuff in NST's isn't tar or pitch (organic), it's asphalt  
(petroleum based), mixed with silica flower (powdered sand) to improve the  
insulation, body and heat transfer. I suspect the NST factories use the  same asphalt 
compound as roofers and mix in silica flower right before pouring.  I'd guess 
that it would be poured at near 500 degrees to reduce the viscosity  enough to 
saturate the coils. 
 
Asphalt is easy enough to get, but I don't know about silica flour. I  
suppose you could ball mill your own out of sand if you were so inclined.
 
You might try remelting the paraffin and holding the temp just above  melting 
for a while to let the bubbles rise to the surface, and then letting it  cool 
overnight in the oven.
 
Tony Greer

In a message dated 1/17/2009 9:28:55 P.M. Central  Standard Time, 
evp@xxxxxxxxxxx writes:
Does anyone know  where to get the type of black "tar" used to pot 
transformers?  Does  anyone know the actual temperature at which it's 
poured into the  transformers?  Did a web search but got nowhere and 
suspect that  roofing tar or pitch probably isn't suitable.  I want to 
pot a couple  of GMHEI transformers in a cylinder to simulate the 
secondary of a "spark  coil" and don't want to mess with oil or the 
like.  Paraffin wax  doesn't work, at least for me, because of too many 
bubbles - I've tried  pretty hard to get rid of them [with the exception 
of vacuum] without much  luck.

Ed
 
**************Inauguration '09: Get complete coverage from the nation's 
capital.(http://www.aol.com?ncid=emlcntaolcom00000027)
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