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Re: [TCML] caps


Found one reference to the development of "Lectronol", dated 1945.

It states that Lectronol caps are twice as good as mineral oil filled caps. Therefore, unless they are using castor oil, I'd bet that these are some sort of PCB filled caps.

Their specs are excellent for TC work, though the voltage and capacitance are a bit low. I'd bet that they would withstand voltages up to their rated nameplate values, and come back for more.

If you already own them, and they are not leaking, then I'd go ahead and try them for TC work. You could even try using the water cooling, if they seem to get hot.

If you don't own them, I'd steer clear of them. Disposal of a PCB filled cap down the road can become a major and costly headache.

Abstract of 1945 article follows below. Full article costs $36.00, unless you are an IEEE member. Perhaps one of the other list members can access the full article for confirmation.



Increased military production has accelerated the application of high-frequency heating where accurate control of temperature for short intervals is fundamentally important. The heating of metals by induction has been widely applied. The present paper describes the development of a new type of dielectric liquid called Lectronol. Capacitors containing this liquid are particularly well adapted for use in the tank circuit of electronic heaters used in induction heating. The capacitor is water-cooled and is housed in a hermetically sealed completely filled nonmagnetic container so constructed as to provide sufficient flexibility to take care of the liquid expansion due to thermal changes. The capacitor is noteworthy because of the absence of cellulose sheet insulation, satisfactory operation being entirely dependent on the superior insulating properties of the Lectronol. Capacitors containing this liquid are characterized by low dielectric loss and high dielectric strength over the frequency range utilized in power oscillators. The capacity per unit volume is approximately twice that obtained with mineral oil. The electrical characteristics of the capacitor are stable under severe conditions of use.

On 11/24/2012 3:29 PM, Randy Burk wrote:
I have 3 Westinghouse water-cooled caps in aluminum housings.  They are

at 7800V, 240 Amps, Freq 540 KC, .0076 mf.  They contain lectronol as the

Are these suited for TC service?  What is lectronol and is it hazardous?


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