Can I Use JB Weld to Build DIY High Voltage Vacuum Feedthroughs?

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SUMMARY

This discussion centers on the feasibility of using JB Weld for constructing high voltage vacuum feedthroughs from alumina. Users have noted JB Weld's effectiveness in vacuum applications, but caution is advised regarding its dielectric strength. The consensus is that without specific dielectric strength data or testing at double the intended voltage, JB Weld may not be reliable for high voltage applications. Additionally, the discussion emphasizes the importance of purchasing commercially available feedthroughs if they meet the requirements, as they are widely available and often more cost-effective.

PREREQUISITES
  • Understanding of high voltage electrical systems
  • Knowledge of vacuum technology and maintenance
  • Familiarity with materials like alumina and their properties
  • Basic principles of epoxy adhesives and their applications
NEXT STEPS
  • Research JB Weld dielectric strength specifications
  • Learn about high voltage feedthrough design and standards
  • Explore alternative epoxy adhesives suitable for vacuum applications
  • Investigate commercially available high voltage vacuum feedthroughs
USEFUL FOR

This discussion is beneficial for electrical engineers, experimental physicists, and hobbyists involved in high voltage applications and vacuum technology who are considering DIY solutions for feedthroughs.

SupaVillain
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I want to build high voltage feedthroughs (vacuum) from epoxying pieces of alumina together, and then epoxying alumina strips on the outside to cover the spaces between. Can I use JB weld, as far as things go electrically? People have reported that JB weld is unexpectedly wonderful for vacuum.

Provided I have the correct amount of alumina per the amount of kv I am applying to it, the electricity won't break down or break through the linings of epoxy will it? It's very expensive to get blocks of alumina and machine them
 
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I think it would be useful to see a drawing of the feedthrough and where you intend to use the epoxy. Also what vacuum are you trying to maintain?
 
A vacuum of 10-4 torr, it's really not a question of design it's more about the epoxy, I am asking if the voltage will be able to move through the epoxy and connect to the vacuum chamber or other nearby objects within the voltages reach.
 
http://www.jb-weld.co.uk/technical-data-sheets
 
Unless you have the specs on it dielectric strength, or test it with at least twice voltage you intend to use I wouldn't use it. Why do you have to make your own feed through? Experimental rule: if you can buy a part that meets your needs at a reasonable price then buy it. High voltage vacuum feed throughs are common accessories for vacuum systems.
 

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