General > General Technical Chat
High Voltage insulating resin
Vtile:
--- Quote from: xzswq21 on August 08, 2021, 06:24:22 am ---
Dielectric coefficient= 4.6
--- End quote ---
I don't know exactly, but should that be "Dielectric constant"? If not, what is the difference?
BrokenYugo:
--- Quote from: xzswq21 on August 23, 2021, 07:31:55 pm ---
--- Quote from: BrokenYugo on August 23, 2021, 07:24:26 pm ---I highly doubt you need a $2500 scientific vacuum pump for this, a cheap AC service vacuum pump should do.
--- End quote ---
the price of a used one is only $100-$200 :)
--- End quote ---
I would assume they're cheap used because they have who knows how many hours on them (as I recall, rebuild parts for most brands are expensive or outright never offered) with who knows what sucked through them, probably by careless students*. I'd take a new Chinesium pump over that, e.g. (assuming USA) $150 Harbor Freight 2 stage 3CFM 22.5 micron, or $90 for single stage 2.5CFM 75 micron, even if they're an order of magnitude off spec that's still sub millibar.
*Which is probably why they're asking $2500 for what look a whole lot like a $200 AC service pump with a different hardware kit, schools will just pay it.
xzswq21:
--- Quote from: Vtile on August 23, 2021, 10:41:37 pm ---
--- Quote from: xzswq21 on August 08, 2021, 06:24:22 am ---
Dielectric coefficient= 4.6
--- End quote ---
I don't know exactly, but should that be "Dielectric constant"? If not, what is the difference?
--- End quote ---
Yes, it's dielectric constant.
what do you think about "3M™ Scotchcast™ Electrical Resin 8N"
https://www.3m.com/3M/en_US/p/d/b5005042037/
there are a lot of electrical resin from 3M:
https://www.3m.com/3M/en_US/p/c/coatings/electrical-resins/
is it a good epoxy resin for high voltage transformer potting?
HighVoltage:
No, this 3M product would not work !
It is meant to be applied to motor windings at the end of the winding process.
But not for high voltage insulation.
xzswq21:
--- Quote from: HighVoltage on August 24, 2021, 09:50:17 am ---No, this 3M product would not work !
It is meant to be applied to motor windings at the end of the winding process.
But not for high voltage insulation.
--- End quote ---
I checked most of 3M epoxy resin datasheets but I couldn't find any high voltage characteristic in any of them, actually most of them have 300-400V/mils electrical strength, please help me to find an epoxy resin, some of them are Room temperature curing and some of them are heat curing.
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