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4hv.org :: Forums :: High Voltage
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Can you use beeswax as a potting compound?

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Adam Munich
Sun Oct 02 2011, 02:54PM Print
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Apparently, yes you can. Not only that, shrinkage is minimal, it doesn't crack and it smells nice.


1317567214 2893 FT0 101 0376


Dielectric strength is yet to be determined.
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Luceš
Sun Oct 02 2011, 03:21PM
Luceš Registered Member #4108 Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149
WOW! amazed and without the mess of oil!!! I like how you used legos for a tank cheesey

can you do that with transformers too? say 4 mots?
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Adam Munich
Sun Oct 02 2011, 03:36PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I'm sure you could, but remember: transformers get hot and beeswax melts at 147F.
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Patrick
Sun Oct 02 2011, 04:10PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
The temp issue is the only disadvantage i see, where did you get it? the hardware store toilet thingies?
Candle wax can also be used, but its more brittle, though has a highier melt point.
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Adam Munich
Sun Oct 02 2011, 04:19PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
$7 for a block at the craft store ($4 with a coupon). One block was used to fill that CW's legobox.

I used a double boiler to melt it for safety reasons. Basically a pickle jar in boiling water.

Paraffin wax tends to crack, shrink and bubble as it dries, making it useless for potting. The beeswax didn't do much of any of that though.
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Herr Zapp
Sun Oct 02 2011, 06:04PM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
A 1:1 ratio of beeswax/rosin has been used for many years as HV insulation/potting compound compound, as well as a sealant for high-vacuum apparatus. The rosin reduces shrinkage, increases the melting point, and adds "hardness".

Herr Zapp
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Patrick
Sun Oct 02 2011, 07:19PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Grenadier wrote ...

Paraffin wax tends to crack, shrink and bubble as it dries, making it useless for potting. The beeswax didn't do much of any of that though.
The cracking i would have predicted. Ill have to try the rosin trick +bees wax then.
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Luceš
Sun Oct 02 2011, 08:10PM
Luceš Registered Member #4108 Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149
what about large mots that heat very little? Wouldn't you have issues drawing it into the windings, or could you just pull a vacuum to get the air out of the windings?
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Adam Munich
Mon Oct 03 2011, 01:15AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
MOTs run in near saturation even with no-load. There is no such thing as one that stays cool tongue
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Luceš
Mon Oct 03 2011, 01:55AM
Luceš Registered Member #4108 Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149
I beg to differ, I have some REALLY old mots, with rather big shunts, they heat up very little amazed but I only have 2 of them, and I have never seen them on ebay cry

you want pics?
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