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High Voltage insulating resin
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xzswq21:
I want to buy a vaccum pump to remove air bubble in an electrical insulating resin, target pressure as you recommended me should be around 10-50mBar,
internal volume of my Vacuum oven is 0.45 cu.ft. Int or 12.7 Liters (inside chamber dimensions :8"x8"x12”)
now I have two choices for the vacuum pump:

"Fisher Maxima C plus M2C" and "Welch 8890A"

Fisher M2C:
https://www.fishersci.com/shop/products/fisher-scientific-maxima-c-italics-begin-plusitalics-end-vacuum-pump/0125777

https://beta-static.fishersci.com/content/dam/fishersci/en_US/documents/programs/scientific/brochures-and-catalogs/brochures/fisher-scientific-maxima-c-plus-vacuum-pumps-brochure.pdf

Welch 8890A-55:
https://www.idealvac.com/NEW-Welch-8890A/pp/P104262

https://www.idealvac.com/files/brochures/Welch_8890_Owners_Manual.pdf

which one is better for my application? as you see the internal volume of the oven is small.
I will buy a used one, but the Welch 8890 has an air lock system! it means:

--- Quote ---When power to the pump is turned off, this valve closes automatically, maintaining vacuum in the system being evacuated, and vents the inside of the pump to atmospheric pressure.
--- End quote ---
Thanks
BrokenYugo:
I highly doubt you need a $2500 scientific vacuum pump for this, a cheap AC service vacuum pump should do.
xzswq21:

--- 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  :)
David Hess:
A cheap AC service vacuum pump is more than good enough.  A regular air compressor could also be used by attaching to the intake.
Vtile:
Shellac is one natural resin used in the past as electrical insulator.. Most probably is still used as "secret incredient" in many products.  ::)

https://electrical-engineering-portal.com/dielectric-strength-insulator-materials
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