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4hv.org :: Forums :: High Voltage
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Using A Vacuum on Oil and Epoxy for the Purposes of Insulating.

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Patrick
Mon Aug 06 2018, 11:23PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ok with reguards to vapor pressure, will i see it boil if i pull lower than that pressure ?
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2Spoons
Tue Aug 07 2018, 09:09PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Yes. But it can be hard to tell the difference between boiling and air bubbles being pulled out. If you don't have data on the potting compound maybe run a test to find the boiling pressure, then stay above that for your potting.
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Patrick
Wed Aug 08 2018, 12:12AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ok ive contacted the maker for the low pressure specs.
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Patrick
Sun Aug 12 2018, 03:38PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Im still investigating how to degas epoxy. Ive been looking at pall rings, dixon, rings and simple mesh. but i dont know how long the fluid should sit in high vacuum ? should it be minutes or hours or days ? it sounds like the degassing only takes place very near the vacuum fluid layer, hence the need for packing rings.
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Ash Small
Sun Aug 12 2018, 05:44PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Minutes, depends how fast you can pull sufficient vacuum.

Once it stops bubbling that's it.

You want to pull the vacuum with the part to be impregnated already submerged, so when you release the vacuum it gets impregnated.

It can then be removed to cure.

Whether it makes sense to cool the epoxy and hardener before mixing will depend on viscosity, curing time, etc.
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