[TechAssist] Re: Heat sink compound
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 07 Oct 2004 15:46:46 -0500
Good points, Jerry.
I use Thermalloy's Thermalcote. It is available in large cans and small
squeeze tubes, and is very good stuff. This stuff does not thin, run,
or dry out.
From the can, "Directions: Apply thin, even coating to mating
surfaces. After making joint secure, remove excess compound with solvent."
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
J Silverman wrote:
> There is a lot of misunderstanding about "heat sink compound". The best heat
> transfer is metal to metal. Both surfaces need to be highly polished and
> clamped firmly together. Anything else is a compromise. If the surfaces are
> not perfectly flat and highly polished, they will only touch at the high
> spots, so if you can fill in the low spots with almost anything it will be
> better than air.
> The "grease" is just there to to keep the powder filler from falling away.
> Aluminum oxide is the most common filler. Its not a very good heat conductor
> but it is none-conducting, none toxic, and cheap. There are many other
> fillers that could be used that are better heat conductors but they are
> either conducting, toxic, or expensive. But there are special situations
> where they are used.
> So the best way to use a heat sink compound is to use as little as possible
> so as not to interfere with the metal to metal contact. Some devices are in
> plastic cases so that a heat transfer as good as metal to metal could never
> be obtained, but the above advice is still applicable. The reason I say that
> there is a lot of misunderstanding is that I see a lot of units that have
> come from the manufacturer with the compound globbed on thickly, and I
> frequently see the incorrect advice "Be sure to apply lots of heat sink
> compound".
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "al m" <ampm@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, October 07, 2004 8:34 AM
> Subject: [TechAssist] Heat sink compound
>
>
>
>>I know it's off topic but I haven't thought of what I was buying before.
>>Which is better the non silicone or the silicone compound?
>>Al Marquardt
>>ampm@xxxxxxx
>>Al Marquardt Electronic Repair
>>206 W Main
>>Girardville Pa. 17935
>>
>>
>>
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