Mica and Goop

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
B

Bare

Member
Joined 2001
Search Youtube.. Many videos on how to apply heatsink Goop.
A few have demos where they use a glass plate to view the dispersion results of a few application techniques. ie: blob in the middle, smooth uniform application... etc
Odd, but strangely interesting info.
 
anatech

anatech

Administrator
Joined 2004
Paid Member
I use a #2 artists brush to apply the grease. It's been the best method for me for a long, long time now. The #2 brush is about perfect for most packages. The best part is that you don't end up with grease all over the place. Of course, clean the brush after use.

-Chris
 
A

AndrewT

R.I.P.
Joined 2004
kasey197 said:
Given how much better the aluminium oxide pads seem to be maybe we should try to get the store to stock those as well as an alternative?
Click to expand...
The alox are usually either thick (0.06"/60mil/1.524mm), or very thick (0.1"/100mil/2.54mm).
When one takes account of the thermal resistance using the thickness of the insulating substrate, one finds that very thick alox is not much different from thin mica (0.001"/1mil/0.0254mm).
Both can be assumed to have two layers of Thermal Goop to complete the Thermal Path.
 
A

AndrewT

R.I.P.
Joined 2004
Variac said:
.........................

I also think it's safe to say that Kapton isn't a good option..
Click to expand...
Kapton for a thermal interface generally comes in thicknesses from 0.001" to 0.006"
The thicker versions (0.0015" to 0.006") are near useless for high power density.
Use 0.001"/1mil/0.0254mm Kapton with two layers of Thermal Goop and you will find that Kapton performs rather well.

But I can't find 1mil Kapton at a price I am prepared to pay.
 
K

kasey197

Member
Joined 2009
Andrew did you see the reported results in post 218 ? Shows much better results cf mica ?


AndrewT said:
The alox are usually either thick (0.06"/60mil/1.524mm), or very thick (0.1"/100mil/2.54mm).
When one takes account of the thermal resistance using the thickness of the insulating substrate, one finds that very thick alox is not much different from thin mica (0.001"/1mil/0.0254mm).
Both can be assumed to have two layers of Thermal Goop to complete the Thermal Path.
Click to expand...
 
B

Bare

Member
Joined 2001
AndrewT said:
Kapton for a thermal interface generally comes in thicknesses from 0.001" to 0.006"
The thicker versions (0.0015" to 0.006") are near useless for high power density.
Use 0.001"/1mil/0.0254mm Kapton with two layers of Thermal Goop and you will find that Kapton performs rather well.

But I can't find 1mil Kapton at a price I am prepared to pay.
Click to expand...

Local Chinese Junque reseller shop has several width rolls of V thin ~ .001"
(allegedly ..Kapton :) tape for ~2$ a roll.
Dunno if it's ideal, or even genuine Kapton, but the price is attractive.
But then he also sells a package of surprisingly thin precut/holed mica wafers for $2.
 
B

Bare

Member
Joined 2001
:D Have a couple of baggies of the Micas (hey $2)
Just fitted some today actually, to my F6 attempt.
Even fooled with splitting some even further.. for sport.
Got a few to V thin and even intact (uncracked).
Cant see Why the Kapton (?) tape wouldn't work though.
It's V thin and survives My Bics' flame for a decent time.
So it actually is heat resistant

Lees electronics.
Small shop selling seemingly Ebay/Aliexpress sourced 'stuff' .
 
A

AndrewT

R.I.P.
Joined 2004
AndrewT said:
Kapton for a thermal interface generally comes in thicknesses from 0.001" to 0.006"
The thicker versions (0.0015" to 0.006") are near useless for high power density.
Use 0.001"/1mil/0.0254mm Kapton with two layers of Thermal Goop and you will find that Kapton performs rather well.

But I can't find 1mil Kapton at a price I am prepared to pay.
Click to expand...
The 30m roll of 25mm wide koptan arrived from China.

Does the spelling mean it is not Kapton?

The plastic film plus adhesive has a total thickness of ~1.6thou (~1.6mil, 0.04mm) making it fairly good as a Thermal conductor.
I'll try to measure the cleaned film later.

I have noted in the past with pre-applied adhesive that it flows out of the interface when under pressure from clamping and with a bit of heat from the semi device.
I'll see if this version does similar.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom