Shellac for transformers

Nixie · 25th September 2006, 12:56 PM

1. Dewaxed shellac or not?
2. Cheap source of the flakes?
3. What ratio of flakes to methanol?
4. When vacuum impregnating, is it sufficient to have vacuum for only a few minutes? I'm using a water aspirator to create vacuum, and sustaining vacuum for more than a few minutes wastes way too much water (the aspirator is probably on the order of 1500 L/hr).

AndrewT · 26th September 2006, 10:36 AM

Hi,
is shellac the right chemical for a transformer?

Nixie · 26th September 2006, 11:41 AM

I've seen it used before. Various varnishes seem to be used.

Nixie · 15th October 2006, 08:03 AM

Hmm, regular wood varnish seems to work fine. I even had mixed a uretane one with some other type, and diluted the stuff with acetone and methanol so it would flow in the smaller spaces better during the vacuum impregnation.

25th September 2006, 12:56 PM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Shellac for transformers 1. Dewaxed shellac or not? 2. Cheap source of the flakes? 3. What ratio of flakes to methanol? 4. When vacuum impregnating, is it sufficient to have vacuum for only a few minutes? I'm using a water aspirator to create vacuum, and sustaining vacuum for more than a few minutes wastes way too much water (the aspirator is probably on the order of 1500 L/hr).

26th September 2006, 10:36 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, is shellac the right chemical for a transformer? __________________ regards Andrew T.

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26th September 2006, 11:41 AM	#3
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I've seen it used before. Various varnishes seem to be used.

15th October 2006, 08:03 AM	#4
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Hmm, regular wood varnish seems to work fine. I even had mixed a uretane one with some other type, and diluted the stuff with acetone and methanol so it would flow in the smaller spaces better during the vacuum impregnation.

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