Electronics > Repair
Unusual Thermal Paste
2X:
Hi,
I removed the below heatsink and it had an unusual thermal paste where was very sticky and very hardly could dissolve with Isopropyl Alcohol. I used zippo (Lighter Fluid) to dissolved and remove it. Can you recognise from the color what kind of thermal paste is? I believe is a kind o thermal paste that don’t need to replaced (like the thermal pastes that used on PC CPUs for instance) until the heatsink is removed. This paste I beleive I have seen it again in Isolated DC/DC Converters.
Random picture of an Isolated DC/DC Converter
https://ae01.alicdn.com/kf/He3c76c1c55ce445a8c6416fb8a5cf2924.jpg_640x640Q90.jpg_.webp
coromonadalix:
you can find thermal pads with variable thickness, they start at 0.5mm and up
2X:
Hi,
finally I found the below "phase change material". If anyone has experience about the performance of the thermal relief of this material, please tell me.
https://www.digikey.com/en/products/filter/thermal/pads-sheets/218?s=N4IgjCBcpgHAzFUBjKAzAhgGwM4FMAaEAeygG0R5YA2AFjEQF0iAHAFyhAGU2AnASwB2AcxABfImACcsKUhCpImXIRLkQABhCMJIALS15i5fiKlIFAKwb4UuUWqWwl2CAdPLAdjchHz%2B%2BBgYNQaEEQATJ7wnpY%2B9J70PtGwYIZEyc4%2BYBq0ttQ%2BkdH56Z4p3iWw4eFJpcHaunrV0ApQfACuquYUcjpiYkA
T3sl4co1l:
Pictured is not phase change. If it were, you wouldn't be able to pry it off, at least not without heating.
Thermal paste never needs to be replaced, in and of itself. Only if separation has occurred (flowed out of joint, oil sweating, dry filler compound), or the joint is opened and the paste must be redistributed (or added) to maintain an excess to squish out on reassembly.
Tim
2X:
The heatsink I removed it by heating it with a hot air gun... I couldn't remove it cold as long as I tried.
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