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Graphite Thermal Sheet

post #1 of 9
Thread Starter 
I found this.
Is it worth trying out?
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post #2 of 9
lol...this is funny as I've just been discussing something very similar on my project build thread here:-

http://www.overclock.net/t/1346823/subambient-full-submersion-phase-change-cooled-pc/190#post_20649726

I don't know what they quote the lateral heat conductivity as being for this product but the bottom line is that because they are so thin the amount of heat energy they can actually move in the lateral plane is very low.....so basically you end up with a material that only conducts moderately well through the vertical plane and doesn't conduct enough energy laterally.

If you work out the figures you would be better off with copper plate.
post #3 of 9
Thread Starter 
Quote:
Originally Posted by technogiant View Post

lol...this is funny as I've just been discussing something very similar on my project build thread here:-

http://www.overclock.net/t/1346823/subambient-full-submersion-phase-change-cooled-pc/190#post_20649726

I don't know what they quote the lateral heat conductivity as being for this product but the bottom line is that because they are so thin the amount of heat energy they can actually move in the lateral plane is very low.....so basically you end up with a material that only conducts moderately well through the vertical plane and doesn't conduct enough energy laterally.

If you work out the figures you would be better off with copper plate.
Thanx for the Info. But I was thinking of using it for a watercooling setup, so it will be useless for it.
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post #4 of 9
Quote:
Originally Posted by dixson01974 View Post

Thanx for the Info. But I was thinking of using it for a watercooling setup, so it will be useless for it.

Same applies regardless of set up...these things are just useless for high power usage.....If they made them thicker they would act as good heat spreaders due to good lateral conductivity, but if you were thinking of a TIM then other materials are as good or better...they are not intended to be used as TIM.
post #5 of 9
Started looking into this more. Found these: http://www.digikey.com/product-search/en?k=Graphite+Sheets&mnonly=0&newproducts=0&ColumnSort=-677&page=1&stock=0&pbfree=0&rohs=0&quantity=&ptm=0&fid=0&pageSize=25

Are these pads useable for PCs? These go up to 1600 W/m-K, which is.... insane
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post #6 of 9
Quote:
Originally Posted by PyreSpirit View Post


Are these pads useable for PCs? These go up to 1600 W/m-K, which is.... insane

And they are insanely thin...that conductivity figure relates to their lateral conductivity, the amount of heat they can move laterally depends on their conductivity and the cross sectional area which the heat is traveling through......I sadly wasted £30 on a sheet of panasonic pgs graphite sheet before I worked this out.....save your money.....not suitable for high power devices yet.
post #7 of 9
Quote:
Originally Posted by technogiant View Post

And they are insanely thin...that conductivity figure relates to their lateral conductivity, the amount of heat they can move laterally depends on their conductivity and the cross sectional area which the heat is traveling through......I sadly wasted £30 on a sheet of panasonic pgs graphite sheet before I worked this out.....save your money.....not suitable for high power devices yet.

Alright, I'm not really understanding this lateral conductivity and cross section, can someone explain it to me? Can you cut multiple squares of the same size and stack them so it is thicker?? I see they are .07 mm, why not stack 3 or something?
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post #8 of 9
If anyone wants to be the guinea pig, I'm interested in your results!biggrin.gif
post #9 of 9
Quote:
Originally Posted by PyreSpirit View Post

Alright, I'm not really understanding this lateral conductivity and cross section, can someone explain it to me? Can you cut multiple squares of the same size and stack them so it is thicker?? I see they are .07 mm, why not stack 3 or something?

These sheets because of the molecular structure of graphite have different thermal conductivities depending on the direction of heat transfer, they have good conductivity the quoted 1600w/m/c in the lateral direction,that means spreading across the area of the sheet, but the conductivity going through the sheet in a vertical /perpendicular direction is much less 10 -20 w/m/c

But those figures are just the thermal conductivity, it just gives an indication or comparison if you like about how well a certain material conducts when compared to another.

But when considering the total amount of heat a a given sheet or block can carry you also have to consider the size of the material the heat is passing through, a thick copper rod will pass more heat energy along it's length than a thin copper rod for the same temperature difference between their ends.

Which brings us back to the graphite sheets they are very thin and can only carry a small amount of energy through them.

If like you said you stacked them up.... then yes that would help but to pass through to the outer layers of graphite the heat would have to first go through the less conductive vertical/perpendicular direction which conducts much more poorly ( irrespective of the resistance that would occur between the layers)

So taking your scenario of 3x 0.07mm sheets stacked together, even at 1600w/m/c that is only 4x that of copper so they would carry the same amount of heat energy as a 4 x 0.07 = 0.28mm sheet of copper in the lateral direction...and would in effect be far less effective than the copper as its conductivity is not dependent on direction of heat movement...... a 0.28mm thickness sheet of copper would not be thick enough to adequately move he heat produced by a cpu.... so just to reiterate...ATM these graphite sheets are only suitable for low power devices.......listen to me being smart AFTER I bought as sheet of the stuff and wasted my money......those high figures are so seductive......but they only tell part of the story...just the same as the demos that use infra red camera to show these sheets distributing the heat so well.....but they don't show the total amount of heat they are moving .
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