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.
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.
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
-Chris
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?
Well, I don't like the sound of "very expensive" but the Kerafol aren't exactly cheap!
I think we need some numbers not just statements...
I also think it's safe to say that Kapton isn't a good option..
I think we need some numbers not just statements...
I also think it's safe to say that Kapton isn't a good option..
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.
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.
Andrew did you see the reported results in post 218 ? Shows much better results cf mica ?
I didn't remember that post, nor those results.
I am aware of the differences that thickness makes to Rth c-s
Many forget to take thickness into account.
I am aware of the differences that thickness makes to Rth c-s
Many forget to take thickness into account.
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.
Hi Bare,
I'd be buying lots of mice insulators if I were you.
What's the name of the place? I'd like some more TO-3 insulators. (I guess TO-204 for the younger folks out there).
-Chris
I'd be buying lots of mice insulators if I were you.
What's the name of the place? I'd like some more TO-3 insulators. (I guess TO-204 for the younger folks out there).
-Chris
😀 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' .
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' .
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.