Re: [TCML] Re: Tar

[ashumate3@xxxxxxx]

FYI
I have somewhere in the stuff I have accumulated a transformer. The Primary  
is 2400 volts with the secondary of 110/220 That is 110 to Neutral and 220 to  
neutral It came from a city utility. It has brackets for pole mounting and is 
 totally encapsulated in a very hard tar. No other outer cover.
 
 
In a message dated 1/20/2009 9:52:34 A.M. Eastern Standard Time,  
Russell.L.Thornton@xxxxxxxx writes:

Ed,
The high voltage transformers that are filled with oil are  subjected to 
vacuum to pull the air out of all the 
little  crannies.  I would expect that wax and tar, being less fluid, would  
especially need this procedure to
be sure there are no pockets of  air.  With the heat requirements you are 
looking at a more complex  setup.
You may want to consider the oil again and maybe change your  container.
Just my 2 cents soon to be 1 cent.
Russell at the Cape...Go  Delta!



>Message: 3
>Date: Sat, 17 Jan 2009 15:42:10  -0800
>From: Ed Phillips <evp@xxxxxxxxxxx>
>Subject: [TCML]  TAR
>To: Tesla Coil Mailing List  <tesla@xxxxxxxxxx>
>Message-ID:  <49726CD2.508@xxxxxxxxxxx>
>Content-Type: text/plain;  charset=ISO-8859-1; format=flowed
>
>   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
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