We are considering using a thermally conductive putty. Its viscosity is specified as 5e6 mPas.
Does anyone have a feel for what that is? Oatmeal, play-doh, modeling clay, plumbers putty?
The t-global TG-PP-10 has a specified thermal conductivity of 10 w/mK, which is about 10x better than a "thermally conductive" epoxy. I suspect that it has a lot of fillers.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
That is about halfway between peanut butter and window putty.
I think Larkin should use peanut butter >:-} ...Jim Thompson
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| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| STV, Queen Creek, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
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It's what you learn, after you know it all, that counts.
I'm the cheapskate. I own cheapness. I've tried toothpaste. It works very well while wet, something like a couple more degrees (memory vague) on a hungry AMD 8 core CPU.
Peanut butter's too valuable.
NT
Which is not unrelated to the viscosity, of course.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Like that stuff between your ears, presumably.
I prefer super chunky peanut butter, which wouldn't work well between a part and a heat sink. And there are mice to consider.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Right. A lot of filler will make theta lower but make the stuff harder, the limiting case being a solid block of alumina or some such at 25 w/mK or so.
We ordered some, so when it comes in we can handle it and see how it feels. But if 5e6 is rock hard, we should order some softer stuff, maybe 5 w/mK.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Peanut butter is my favorite bait for mouse traps. George H.
Also rabbits. ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
WTF? why can't they write 5kPa? That's about 0.7 PSI
ballpark Play-Doh (tm) by my reckoning (the other substances listed being less consistent, and some of them thixotropic)
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How can you fit a rabbit into the little metal clip?
They're both rodents, so I guess you would use a capibara as bait in a rabbit trap.
Units conversion error: well, more like units conversion catastropphe. Viscosity (poises is the usual unit) is like, grams/(cm-second), that 'Pas' thing is an oddball variant. The poise unit usually is denoted P, which is a duplcate of the pascal unit, also P. The only difference is, poise is g/cm/sec system and pascal is kg/m/sec system. So, in g/cm/sec, the Pascal is denoted 'Pa'.
If this doesn't confuse you, you've failed the Turing test.
And the 'Pas' is actually pascal-seconds.
My favorite too. But last year my son had a mouse that did not like peanut butter and he had to use black walnuts as bait.
Dan
We got a small jug of the t-global putty. It's pretty soft, a bit softer than new plumber's putty maybe. It would be easy to measure out a bit and smoosh it into a milled cavity and then push a PCB with parts into that. But realistically, a silicone gap-pad would be easier to work with, if the lower thermal conductivity were OK.
It is a little greasy, like plumbers' putty.
Dielectric constant is not specified!
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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