Author Topic: Fill inside of secondary with polyurethane spray foam  (Read 702 times)

Offline Zipdox

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Fill inside of secondary with polyurethane spray foam
« on: March 14, 2020, 04:44:45 PM »
Is it a stupid idea to fill the inside of the secondary with polyurethane spray foam to prevent arcing?

Offline John123

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Re: Fill inside of secondary with polyurethane spray foam
« Reply #1 on: March 14, 2020, 05:33:59 PM »
Not sure about the dielectric properties but I'd give it a fire test first, sometimes this sort of thing can go up in flames.

Offline davekni

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Re: Fill inside of secondary with polyurethane spray foam
« Reply #2 on: March 14, 2020, 06:20:13 PM »
I'd say it was quite smart to ask first.  Since foam is mostly air (or another gas), it does not provide significant insulation.  What's worse, small bits of corona or other discharges will slowly carbonize the foam, causing conductive tracks through it.

I did learn this the hard way:)  On my Marx generator rather than a Tesla coil.
David Knierim

Offline johnf

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Re: Fill inside of secondary with polyurethane spray foam
« Reply #3 on: March 15, 2020, 05:08:54 AM »
Use standard bees wax or parafin wax
easy to get out later by putting the whole thing in a warm box and melting it
If you are clever yout put a tap on the bottom of your tank to drain it.

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Re: Fill inside of secondary with polyurethane spray foam
« Reply #3 on: March 15, 2020, 05:08:54 AM »

 


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