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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
No. Not that I've potted any windings myself, or watched it done. Vacuuming the mixing pot can get rid of most tiny bubbles. Vacuuming the potting pot won't affect resin viscosity, surface tension, or wire-wetting properties. It can prevent tiny bubbles from forming as resin soaks into the windings, if resin is poured in a vacuum.
Best way to reduce the viscosity is to heat the resin, and deal with the reduction in working time.
Why is important for resin to penetrate coils of fine wire, except to improve tolerance to vibration?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I think that the viscosity would not change, but the lack of air may prevent the forming of a skin on the potting compound as it penetrates voids, stopping due to surface tension.
I'd probably give the coil a few dips in polyurethane varnish or similar, with drying after each dip. Clean up excess polyurethane then pot the assembly as required.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
'Vacuum impregnation' is certainly a thing in the industry, I've seen it done with electric motor stators but with much thicker wire. For fine wire I guess you'd need to use some type of varnish with a viscosity more like water.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
I have had a lot of good experience with this for waterproofing electronics. The breakdown voltage isn't too bad either, and the viscosity is on par with water, and the lowest I could find for an OK price, it's pretty cheap and easy to find. It has a nice hard-rubber consistency after curing, but will crumble if heated with a hot-air gun.
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Pulling a vacuum on potting compoud
