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Forums
4hv.org :: Forums :: General Chatting
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Soft Encapsulants.

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Patrick
Sun Jan 27 2019, 11:28PM Print
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		ive reviewed previus threads reguarding this matter from years ago JPsmith used Qsil12, but im wondering if anyone has found a better or cheap 2-part silicone for HV encapsulation?
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2Spoons
Mon Jan 28 2019, 12:32AM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
 		I think urethanes are generally cheaper than silicones.
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Patrick
Mon Jan 28 2019, 03:32AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		let me look at the urethanes.

I did find this:
Link2
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2Spoons
Mon Jan 28 2019, 08:01PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
 		Ouch$! USD 200 per litre !!
Urethane casting resin - probably a rigid resin - is going for $50/gallon on ebay. Flexible resin will be a similar price probably.
One thing with urethanes though - you MUST keep the resin components dry. The isocyanate part reacts with water to form CO2 - this is how urethane foams are made. Great for
thermal insulation, terrible for potting electronics.
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Patrick
Wed Jan 30 2019, 06:19AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		were going to start with this one :

Link2

2 are on the way. 800ml total for 20 US$ , 20kV per mm.
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Patrick
Tue Feb 05 2019, 06:30AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		here it is, 800 mL.

it looks like its about as viscous as honey. maybe thicker. im not sure what that means for getting in between turns on the fine secondary wires.

i could vacuum pull it, then pressure it to 50 psi.

pic: Link2
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2Spoons
Wed Feb 06 2019, 02:54AM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
 		The datasheet says its thixotropic, so vibration should help it flow.
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Patrick
Wed Feb 06 2019, 05:13AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		ok, ill build a cup to hold the liquid, a magnet drop system, and then a vibrating device ? like a piezo speaker ? i have deafening ones fro home burglar alarms. what frequency would be desirable ? the container will also be able to hold 50 Psi if needed.
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hen918
Wed Feb 06 2019, 12:41PM
hen918 Registered Member #11591 Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
 		A hobby motor with an off-centre weight on the shaft is a very useful source of vibration for that kind of thing.
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the_anomaly
Wed Feb 06 2019, 07:46PM
the_anomaly Registered Member #19 Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
A hobby motor with an off-centre weight on the shaft is a very useful source of vibration for that kind of thing.

I tried using a cell phone vibration motor for something similar but it was not enough. So as long as the hobby motor is larger, I think this will be a good option. Old PS2 game controllers have decent sized vibration motors.
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