[TechAssist] Re: Heat sink compound

  • From: "J Silverman" <greentron@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 9 Oct 2004 14:48:06 -0400

You would need to know which one results in the lowest resistance to heat
flow under the conditions likely to be encountered as it would normally be
used. We dont have any good way to tell this, so we have to rely on the
manufacturer of the compound to provide test data.
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: Saturday, October 09, 2004 8:52 AM
Subject: [TechAssist] Re: Heat sink compound


> GEEZ guys my original question was which is better the silicone or the
> non-silicone.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> To: "Edward Gaidies" <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, October 09, 2004 1:33 AM
> Subject: [TechAssist] Re: Heat sink compound
>
>
> >I agree. For those who are keeping score, at this time it appears to
> > be a draw. Heat sinks are never hotter than the device they are
> > cooling, and then again they are (several replies).
> >
> > Thanks for all your input
> >
> >
> > Bil Green
> > PC 1000
> > Mammoth Lakes, CA 93546
> > 760-924-1000
> >
> > Friday, October 8, 2004, 9:16:47 PM, you wrote:
> >
> > EG> Yes,;-)
> >
> > EG> Let it go...
> >
> > EG> It's like that  question I asked my Secretary.
> >
> >
> > EG> I'm going down the Highway..in my Van.
> > EG> My speed is 70..Fly comes and sits on my nose,,I keep
> > swatting...buzzes
> > EG> around..relands on my nose.
> > EG> Now..is that fly using gravity..relation to motion..air relation..??
> > EG> Some "Rednecks" will question the "70" for miles or Kms. Never mind.
> > ;-)
> >
> >
> > EG> -Ed-
> > EG> *****************************************************************
> > EG> Ed Gaidies
> > EG> Tel-Tek Electronics
> > EG> Ontario-Canada
> > EG> teltek3@xxxxxxxxxxxx
> > EG> teltek@xxxxxxxxx
> >
> > EG> On 9-Oct-04, at 12:03 AM, Bil Green wrote:
> >
> >>> I am simply reporting what I have noticed when touching the plastic
> >>> body of the transistor or chip. And another tech mentioned the same
> >>> thing in his post.
> >>>
> >>> When you try to remove a plastic container from a 350 degree oven
> >>> it doesn't feel anywhere near as hot as a glass container. So maybe
> >>> the plastic portion of the transistor isn't as hot.
> >>>
> >>> I can hold my finger on a hot HOT for a few seconds, but often the
> >>> heat sink is too hot to even touch. Do you guys think this is just
> >>> my imagination?
> >>>
> >>>
> >>>
> >>> Bil Green
> >>> PC 1000
> >>> Mammoth Lakes, CA 93546
> >>> 760-924-1000
> >>>
> >>> Friday, October 8, 2004, 7:39:43 PM, you wrote:
> >>>
> >>> gjc> Come on Bill,
> >>>
> >>> gjc> I respect you and very much enjoy your posts.  But, it is
> >>> impossible for
> >>> gjc> a heat sink to be hotter than the transistor attached to it.  I
> >>> have a
> >>> gjc> laser thermometer that I use.  NEVER have I seen the heat sink to
> >>> be
> >>> gjc> hotter than the transistor.  After all, where does the heat come
> >>> from?
> >>>
> >>> gjc> Plastic transistors are hardest to test, but the highest
> >>> temperature
> >>> gjc> measured would be equal to or lower than the actual temp. of the
> >>> gjc> semiconductor.
> >>>
> >>>
> >>> gjc> Ken Smith
> >>> gjc> Gulf Technical Services
> >>> gjc> 3034 Gulf Breeze Parkway
> >>> gjc> Gulf Breeze, FL  32563
> >>> gjc> 850-934-8324 (Voice), 850-932-0819 (fax)
> >>>
> >>> gjc> On Fri, 8 Oct 2004 14:00:41 -0700 Bil Green
> >>> <tv.vcrrepair@xxxxxxxxxxx>
> >>> gjc> writes:
> >>>>> Actually I'm right. When you place your finger against the plastic
> >>>>> section of a transistor or IC which is on a heat sink the
> >>>>> temperature usually feels cooler the heat sink.
> >>>>>
> >>>>> You can't place your finger on the rear (often metal) side which is
> >>>>> against the heat sink (and may be much hotter).
> >>>>>
> >>>>> But the heat sink is often hot enough to burn your finger (and
> >>>>> often the device is definitely NOT). Now maybe the plastic just
> >>>>> doesn't transfer the heat to your finger very well. I'm don't care
> >>>>> about science at this point, only what I see or feel.
> >>>>>
> >>>>>
> >>>>> Bil Green
> >>>>> PC 1000
> >>>>> Mammoth Lakes, CA 93546
> >>>>> 760-924-1000
> >>>>>
> >>>>> Friday, October 8, 2004, 1:22:50 PM, you wrote:
> >>>>>
> >>>>> TTE> Bil...
> >>>>> TTE> Now you know better then that.
> >>>>> TTE> Basic Science.;-)
> >>>>> TTE> That would be Thermal Energy in reverse. The source has to be
> >>>>> more then
> >>>>> TTE> the dissipation.
> >>>>>
> >>>>> TTE> Ask Wayne.;-)
> >>>>>
> >>>>> TTE> -Ed-
> >>>>>
> >>>>> TTE> Tel-Tek Electronics
> >>>>> TTE> Ontario-Canada
> >>>>>
> >>>>> TTE> teltek3@xxxxxxxxxxxx
> >>>>> TTE> teltek@xxxxxxxxx
> >>>>>
> >>>>>
> >>>>> TTE> -----Original Message-----
> >>>>> TTE> From: techassist-bounce@xxxxxxxxxxxxx
> >>>>> TTE> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bil Green
> >>>>> TTE> Sent: Friday, October 08, 2004 3:57 PM
> >>>>> TTE> To: J Silverman
> >>>>> TTE> Subject: [TechAssist] Re: Heat sink compound
> >>>>>
> >>>>> TTE> Isn't the heat sink always hotter than the device? Heat rises
> >>>>> and is
> >>>>> TTE> stored by the heat sink.
> >>>>>
> >>>>>
> >>>>> TTE> Bil Green
> >>>>> TTE> PC 1000
> >>>>> TTE> Mammoth Lakes, CA 93546
> >>>>> TTE> 760-924-1000
> >>>>>
> >>>>> TTE> Friday, October 8, 2004, 9:50:46 AM, you wrote:
> >>>>>
> >>>>> JS>> So it sucks so much heat out that the heat sink is hotter than
> >>>>> the
> >>>>> TTE> devices
> >>>>> JS>> doing the heating? Patent it quick!
> >>>>> JS>> Jerry Silverman
> >>>>> JS>> Greentron Inc
> >>>>> JS>> 4 Newland Ave
> >>>>> JS>> Greenville SC 29609
> >>>>> JS>> Fax/Phone 864 232 3889
> >>>>> JS>> mail to: greentron@xxxxxxx
> >>>>> JS>> ----- Original Message -----
> >>>>> JS>> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> >>>>> JS>> To: "Paul" <techassist@xxxxxxxxxxxxx>
> >>>>> JS>> Sent: Thursday, October 07, 2004 4:46 PM
> >>>>> JS>> Subject: [TechAssist] Re: Heat sink compound
> >>>>>
> >>>>>
> >>>>>>>> I have been using silicone grease. It's available in a tube,
> >>>>> used for
> >>>>>>>> servicing pools and hot tubs, also boats. Designed for high heat
> >>>>>>>> applications. Has worked well for many years (and it's clear).
> >>>>>>>>
> >>>>>>>> The heat sinks get much hotter than the transistors and chips so
> >>>>> I
> >>>>>>>> know for sure that it's working.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> Bil Green
> >>>>>>>> PC 1000
> >>>>>>>> Mammoth Lakes, CA 93546
> >>>>>>>> 760-924-1000
> >>>>>>>>
> >>>>>>>> Thursday, October 7, 2004, 10:10:38 AM, you wrote:
> >>>>>>>>
> >>>>>>>> P> Hi Al, been using GC silicone 10-8101 for about 20 years.
> >>>>> Never
> >>>>> TTE> had a
> >>>>> JS>> repeat failure due to its use. I like it because it is less
> >>>>> messy
> >>>>> TTE> than the
> >>>>> JS>> white or pink stuff the mfgs use.
> >>>>>>>> P>
> >>>>> JS>> Paul
> >>>>>>>> P> al m <ampm@xxxxxxx> wrote:
> >>>>>>>> P> I know it's off topic but I haven't thought of what I was
> >>>>> buying
> >>>>> JS>> before.
> >>>>>>>> P> Which is better the non silicone or the silicone compound?
> >>>>>>>> P> Al Marquardt
> >>>>>>>> P> ampm@xxxxxxx
> >>>>>>>> P> Al Marquardt Electronic Repair
> >>>>>>>> P> 206 W Main
> >>>>>>>> P> Girardville Pa. 17935
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>> P>>>
> >>>>> TTE>
> >>>>>
> >>> gjc>
>
>>> -----------------------------------------------------------------------
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> >>>>>>>> P> Central TV&Video
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> >>>>>>>> P> Grover Beach Ca.
> >>>>>>>> P> (805)481-8084
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
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> >>>>>
> >>> gjc>
>
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