[TCML] Re: Tar

[Russell L Thornton <Russell.L.Thornton@xxxxxxxx>]

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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