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4hv.org :: Forums :: General Science and Electronics
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What types of resisters can be submerged in oil?

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Matt Edwards
Sat Aug 28 2010, 11:40PM Print
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
I have read somewhere that the coating of some resistors can become softened and even eventually decentegrate when submersed in oil. Does anyone have experience whith this or know which resistors can safely be submerged?
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Proud Mary
Sun Aug 29 2010, 01:08AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
You'd really have to say what sort of oil, and at what temperature, to get much of a meaningful reply.

But in a general way, silicone coated resistors may be attacked by hot oils, while vitreous and ceramic types can survive almost anything.

The resistor manufacturer's product data sheet should make such limitations clear.
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Matt Edwards
Sun Aug 29 2010, 02:23AM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Thank you! I had not thought about looking at the datasheet for this information.
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radiotech
Sun Aug 29 2010, 04:36AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
What is the reason for immersion in oil? Is it for cooling or high voltage insulation? Resistors have votage ratings; It is possible to overvolt a resistor without exceeding its power rating. Link2
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Matt Edwards
Sun Aug 29 2010, 06:03AM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
I was looking into it for both heat and insulation. Thanks for the link though. I will check out prices on those.
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