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Re: unpotting of nst?



Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

I think the stuff is very cheap epoxy with saw dust filler. This place sells plenty of solvents for it, but you won't be able to afford the hazardous shipping charges ($100 a few years back...)

http://www.dynaloy.com/Products/potting_removers.html

You will need a fire and fume hood since you have to heat it about 100C above the flash point >:-))) Disposal is also a "state" thing... You also need the usual safety garments and all for powerful acids...

I used to play with this stuff all this time. Works good!! Legend says it is New Jersey river water... But it is really a Witch's brew of acids... Don't bother with baking soda, that will just make it explode... Almost as fun as fuming sulfuric acid...

About 100X easier and cheaper just to throw the NST away and by a new one...

I seem to remember trying MEK and acetone at the lab on some chunks of NST potting before... They did not touch it. I forget the flavor of Dynasolve we used, but that did make it "soft" on the outside... Never tried fuming nitric but it should have dented it ;-)) But the quantity needed is far far outside the magnitude of practicality here...

All will destroy the winding insulation in any case... Maybe you could hammer it to get a few useful parts for rewinding or something. But to make a long story short, a dead epoxy NST "IS" DEAD...

On the good side, epoxied NSTs don't crack or deteriorate over time like tar. If "you" don't break them, they will never fail... My ACtown epoxy NST has been through it all,and seems as good as new...

If you want to take apart an NST, get a tar one and a grill, kerosene, hair dryer...

But far far best just not to break it in the first place ;-)))

http://hot-streamer.com/TeslaCoils/Misc/NSTFilt.jpg

Cheers,

        Terry


At 08:53 PM 11/27/2006, you wrote:
Hey Russ...

Ive heard that it can be done with some nasty solvent ( methyl something) but it also takes the varnish off of the wires too... the resin is difficult to remove under most circumstances, hard as a rock, even with a hammer and chisel, it was difficult.

Scot D


Tesla list wrote:

Original poster: russell dischar <hightechredneck2005@xxxxxxxxx>

Is there any way to unpot a polytrans transco transformer. It is potted in some kind of resin and i was just wondering if its possible?
thanks
russ