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Old 10th January 2008, 02:13 AM   #1
j beede is offline j beede  United States
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Default Where to get CLEAR thermal grease?

My amplifier's outputs were mounted with clear thermal grease and mica insulators. All I can find these days is white or silver thermal grease. Anyone know of a source of clear thermal grease?
...j
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Old 10th January 2008, 04:10 AM   #2
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Try Radio Shack. The tube I bought a year ago had clear grease.
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Old 10th January 2008, 04:37 AM   #3
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Any grease or oil will improve thermal conductivity substantially. A tube of clear silicone grease from the NAPA auto store is probably as good as any other clear grease, but it's the loading with various fillers that really improves the stuff and makes it "thermal grease". I would never put a clear grease in my projects, only something like Dow 540 (going from memory on the number), or Thermalloy grease. The auto stores usually sell white thermal grease for use with sensors, and there's nothing wrong with that either.
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Old 15th January 2008, 12:02 PM   #4
OzMikeH is offline OzMikeH  Australia
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The white stuff is Zinc oxide in silicone grease.
Straight silicone grease does work, but not as well.
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Old 18th January 2008, 01:50 AM   #5
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I have made my own using silicone, and mixing aluminum powder into it. I have not yet tested it's effectiveness, although in theory, it should work.

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Old 18th January 2008, 02:07 AM   #6
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Aluminum powder may be a better heat conductor than any oxide but it is also conductive. For parts that have high voltages on them like an OP stage of a power amp , the oxide might be a better idea even though you have an insulator like mica inbetween. Case to heatsink capacitance will also be higher.
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Old 18th January 2008, 04:40 AM   #7
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Things to consider, thanks.
I remember briefly testing it's conductance...40v dc @ 2 amps, probes embedded in the ....silicone mixture about 1/4" apart.....with an current meter in the path. Showed no reading.

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Old 18th January 2008, 09:44 AM   #8
OzMikeH is offline OzMikeH  Australia
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2 thin probes in a blob is very different to clamped between two large flat pieces of metal.

One large particle and it will be a dead short.
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Old 18th January 2008, 02:05 PM   #9
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Yes, a mica insulator pad and other standard precautions are still needed, even with the other "greases".

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Old 18th January 2008, 03:53 PM   #10
cuibono is offline cuibono  United States
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In a pinch, I would use high vacuum grease from my chem lab. Its from dow (i believe), and is used to grease the joints between pieces of glassware when they are going to be evacuated. It is clear, I would assume quite pure (inert), and has a very high melting temperature (300+Celsius?). I measured no conductance across a small distance.

This stuff:

http://wardsci.com/product.asp?pn=IG...:referralID=NA
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