paste or pad

[Outback Jon]

If that Radio Shack stuff you are referring to, is the white zinc
paste, it is horrible stuff.
This is the last product I would be searching
for, to prevent burning up an Athlon. You would be better off using
toothpaste!

http://www.dansdata.com/goop.htm

This guy tried toothpaste. And Vegemite....

--
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http://folding.stanford.edu - got folding? Team 33432

 

[~misfit~]

With the strength of the clamps on the HS's for modern CPU's, if the
HSG doesn't get squeezed out, then the HSG is WAY too thick in
vicosity for this application.

Then again I've never been suckered into $25 a tube HSG either!

Wht do you insist on calling it HSG (grease)? It's thermal compound or HSC
if you prefer, even HSP (paste). It isn't a lubricant (or fat-based) so why
call it grease?

 

[Leythos]

Again given the strength of the clamps used today on HS's, I can't imagine
it not being squeezed out, at least not "normal" HSG like the RS white
stuff. Maybe that conductive $25 a tube stuff if to viscus to get squeezed
out? If so that's another good reason not to waste money on that stuff!

The stuff that came with my Retail Xeon CPU's in the syringe came out
nice and smooth, then turned to a rock before I could finish the
install. The dry paste did not compress very much, was a good .07"
thick. I used normal HSP and can't tell the diff between CPU1 (with
Intel HSP) and CPU2 with the white stuff.

 

[~misfit~]

http://www.dansdata.com/goop.htm

This guy tried toothpaste. And Vegemite....

.....And that link is posted to ACH for the 217th time....

 

[Stacey]

Stacey wrote:

Yes, well, there are a lot of different thermal compounds and who knows
what someone is using, not to mention what processor, when they read "too
much just gets squeezed out."

Are you willing to guarantee that for every HSG in existence and whether
it's an Athlon die or a P4 heat spreader?

Nope, just that "normal" white thermal paste doesn't seem to have that
problem.

 

[Stacey]

Stacey wrote:

Wht do you insist on calling it HSG (grease)? It's thermal compound or HSC
if you prefer, even HSP (paste). It isn't a lubricant (or fat-based) so
why call it grease?
--

That's what the last tube I bought had on the side, sorry....

 

[David Maynard]

David Maynard wrote:




Nope, just that "normal" white thermal paste doesn't seem to have that
problem.

The original statement didn't specify any particular thermal compound but
simply said that 'too much' wasn't a problem because it would get 'squeezed
out' and it is that generic statement I was responding to.

Virtually any zinc oxide based thermal compound is going to be white,
unless something else colors it, so I don't know what 'normal' would be.

 

[Stacey]

... so I don't know what 'normal' would be.

Sorry can't help you on that front.

 

[George Macdonald]

Wht do you insist on calling it HSG (grease)? It's thermal compound or HSC
if you prefer, even HSP (paste). It isn't a lubricant (or fat-based) so why
call it grease?

It (most?) often uses silicone grease, or heavy oil, as the carrier for the
zinc oxide powder... and some of the packages call it "grease".

Rgds, George Macdonald

"Just because they're paranoid doesn't mean you're not psychotic" - Who, me??

 

[George Macdonald]

If that Radio Shack stuff you are referring to, is the white zinc paste,
it is horrible stuff. In years past, I used it on heatsinks for an audio
amp, and the paste separates into a clear fluid and a white residue.
It left the heatsink high and dry, after only a short period. The
reason this happens, is there is no chemical change in the product
with time and heat, and the formulation is such that the chemicals
separate. This is the last product I would be searching for, to
prevent burning up an Athlon. You would be better off using toothpaste!

The Radio Shack brand stuff *is* horrible IME - it seems to separate
quickly and lose its fluid carrier... leaving just a cake of white powder.
I've used other similar looking paste purchased from an electrinics parts
store which was still *paste* after 5years.

The AS3 product apparently changes a bit over the first several days
of operation with a warm CPU. I think the idea is, it thickens when
heated, so that once the die has settled into position, the material
stays put. The only problem with this approach, is the stuff changes
enough that it approaches a "dry" consistency over a period of
months, and that is when it needs to be changed out.

The purpose of any interface material, is to fill the air gaps, as
air is a relatively good insulator. That means, you want a film that
is thick enough to take the place of any air, and not any more than
that. When you use sil pads or phase change material, you have to
select the thickness based on the spec for surface flatness for the
two assemblies you are joining. The thermal designers I've worked
with use thicker materials than I would as a hobbyist.

The "pink pads" are different from the phase change stuff - the latter
first goes softer under the heat, spreads and molds itself into the nooks
and crannies and then finally after a few days hardens into what feels like
a hard plastic.

Rgds, George Macdonald

"Just because they're paranoid doesn't mean you're not psychotic" - Who, me??

 

[billh]

Wht do you insist on calling it HSG (grease)? It's thermal compound or HSC
if you prefer, even HSP (paste). It isn't a lubricant (or fat-based) so why
call it grease?

Still referred to as grease by some vendors but term is also historical
since the early HS compounds were nothing more than a silicone grease and
worked fairly well but the demands weren't as stringent as for high-power
CPUs. The white zinc-based compounds then came out and were much better and
that was the start of the evolution into what we have today.
Billh

 

[David Maynard]

David Maynard wrote:




Sorry can't help you on that front.

Oh. I thought since you were the one who said it you could.

 

[Phil Weldon]

Butter; unsalted, 985 butterfat. Replace when rancid.

--
Phil Weldon, pweldonatmindjumpdotcom
For communication,
replace "at" with the 'at sign'
replace "mindjump" with "mindspring."
replace "dot" with "."

 

[gooey]

I'm working on a combo CPU cooler/popcorn popper. Heat from the CPU is used
to heat my popcorn oil and pop my corn. Ancillary fan then blows corn into
my patented USB buttering device and comes out the now useful floppy drive
bay. Perfect combination when watching DVD movies on the PC. Gotta work on
the popping noise issue but it's getting there... ;-)