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Thermally conductive adhesive

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Posted by meshach on November 11, 2005, 12:54 am
 
I'm trying to re connect absorbor plates which have separated from the
copper pipes in a hot water solar panel. I need a compound to secure
them with very good heat transfer. I'd prefer not to solder them
because of the corrosive properties of the flux. Have a look at this
link and let me know what you think. Would this stuff have good thermal
conductivity?
http://www.permatex.com/MSDS_data/tds_files/81878.pdf


Posted by Solar Flare on November 11, 2005, 1:17 am
 
No! It states high thermal resistivity.

Solder or braze them and clean the flux off with a commercial cleaner made for
the job. Paint them after maybe.

There are silcone greases for heat conduction used for heat sinking solid state
components but the silicone rubber is different.




Posted by Duane C. Johnson on November 11, 2005, 1:34 am
 Hi Solar;


 > No! It states high thermal resistivity.

No it doesn't!
Nowhere does it mention resistivity at all.

I does say it can handle high temperatures.
And it performs well in the presence to chemicals

 > Solder or braze them and clean the flux off with a
 > commercial cleaner made for the job. Paint them after
 > maybe.

 > There are silcone greases for heat conduction used
 > for heat sinking solid state components but the
 > silicone rubber is different.


 > > I'm trying to re connect absorbor plates which have
 > > separated from the copper pipes in a hot water solar
 > > panel. I need a compound to secure them with very good
 > > heat transfer. I'd prefer not to solder thembecause of
 > > the corrosive properties of the flux. Have a look at
 > > this panel. I need a compound to secure link and let
 > > me know what you think. Would this stuff have good
 > > thermal conductivity?
 > > http://www.permatex.com/MSDS_data/tds_files/81878.pdf

Duane

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Posted by Solar Flare on November 11, 2005, 2:15 am
 It says it in the first line. Hoping you even read it at all.

Silicone rubber is typically not a good conductive of electricity or heat.

There are epoxies out there with metal flakes in them that may perform better.



Posted by Duane C. Johnson on November 11, 2005, 2:52 am
 Hi Solar;

Solar Flare wrote:

 > It says it in the first line.
 > Hoping you even read it at all.

Of course I read it.
The line you are referring to states:
"High temperature resistance".
You said it refereed to "thermal resistivity"
which was incorrect, these are two different
properties.

I guess I could ask if you read the data sheet?

This line is not referring to thermal resistivity
nor electrical resistivity.

In fact, the term "resistivity" is never used in
the document.

"High temperature resistance" is referring to the
ability of the product to perform it's role as a
gasket at high temperatures without deterioration.

 > Silicone rubber is typically not a good
 > conductive of electricity or heat.

I agree in general. But you can't determine
the thermal resistivity from this data sheet.

 > There are epoxies out there with metal flakes
 > in them that may perform better.


 > > > No! It states high thermal resistivity.

This is what you said. But the data sheet says
nothing about thermal resistivity

 > > No it doesn't!
 > > Nowhere does it mention resistivity at all.

 > > I does say it can handle high temperatures.
 > > And it performs well in the presence to chemicals

Duane

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   Powered by             \  \     \        //|
  Thermonuclear   Solar Energy from the Sun / |
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Duane C. Johnson   Designer  \  \  /  \ /    |
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White Bear Lake, Minnesota    === \   / \    |
USA      55110-3364                ===   \   |
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     Home of the $5 Solar Tracker      Receiver
    http://www.redrok.com/led3xassm.htm       [*]
   Powered by             \  \     \        //|
  Thermonuclear   Solar Energy from the Sun / |
Energy (the SUN)           \  \     \  /  /  |
Red Rock Energy             \  \     /   /   |
Duane C. Johnson   Designer  \  \  /  \ /    |
1825 Florence St  Heliostat,Control,& Mounts |
White Bear Lake, Minnesota    === \   / \    |
USA      55110-3364                ===   \   |
(651)426-4766        use Courier New Font \  |
redrok@redrok.com     (my email: address)  \ |
http://www.redrok.com   (Web site)          ===

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