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Author Topic: A magic tape  (Read 2812 times)
clivejo
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« on: September 21, 2011, 05:18:10 PM »

I would like to source a special type of tape, in the UK or Ireland. 

It needs to be :

1) Sticky
2) Electrical insulative
3) Thermally conductive 
4) Not too expensive


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johnrae
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« Reply #1 on: September 21, 2011, 07:08:39 PM »

(1) both sides or just one
(2) and (3) tend to be mutually exclusive when considered in conjunction with (4)

What voltage must the insulation endure
What temperature is the tape required to conduct
What do you consider as inexpensive
What width and length do you require

Without wishing to sound too negative, you really need to provide more information
If you could enlighten as to the application you may get some well informed responses

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clivejo
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« Reply #2 on: September 21, 2011, 07:20:46 PM »

(1) both sides or just one
(2) and (3) tend to be mutually exclusive when considered in conjunction with (4)

What voltage must the insulation endure
What temperature is the tape required to conduct
What do you consider as inexpensive
What width and length do you require

Without wishing to sound too negative, you really need to provide more information
If you could enlighten as to the application you may get some well informed responses



Just one side.  I guess it doesn't really have to be sticky, would just help in application.

I know, but its to replace an existing sticky backed tape in a Trace inverter.  Its job is to electrically isolate the FETs which are pressed against the heatsink, but allow heat to dissipate to the sink.  I'm not sure, but I reckon that it would need to withstand about 600 volts(maybe someone knows different).  A roll from the US costs $30, but they want $60 odd for shipping and postage.  I need about 2 foot of it, 3 to be safe.
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guydewdney
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« Reply #3 on: September 21, 2011, 10:43:56 PM »

10 seconds searching:-

http://cpc.farnell.com/akasa/ak-tt12-80/cpu-thermal-adhesive-tape/dp/CS15753
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clivejo
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« Reply #4 on: September 21, 2011, 10:56:24 PM »


It also needs to be electrically insulated.
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SimonHobson
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« Reply #5 on: October 12, 2011, 08:54:51 PM »

Nothing here to help ?
http://uk.farnell.com/thermal-interface-material

I'm assuming the FETs are standard packages (such as TO-220) and for those you can get pre-cut pads for not a lot of brass. And various sizes of plain sheet.
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guydewdney
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« Reply #6 on: October 12, 2011, 09:57:14 PM »

phone 3m tech helpline...
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Mostie
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« Reply #7 on: October 13, 2011, 12:22:19 AM »

something like this?

http://uk.farnell.com/multicomp/mk3306/insulating-kit-mica-to-220/dp/520214
 


« Last Edit: October 13, 2011, 12:24:32 AM by Mostie » Logged

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w0067814
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« Reply #8 on: October 13, 2011, 08:27:30 PM »

You want Kapton Tape. Available from all electronic component stores. RS, Farnell, Mouser, Digikey etc.
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Baz
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« Reply #9 on: October 14, 2011, 12:22:23 AM »

Note the black blob in the linked picture above is also necessary to insulate the bolt you use to hold it down. While Kapton is great stuff fo high temp Blue Peter work I've never seen it used for isolating transistors and there must be a reason for that. although thin it may be a poor thermal conductor and the silicone pads must be better and unlike mica sheet do not need zinc paste to make the thermal bridge.
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