Forum Discussion

MEXICOWANDERER's avatar
Nov 06, 2015

Thermal Mounting Paste Specifications

This technology came along after my horsee and I rode into the sunset. Therefore I have zero experience in comparisons. This is for mounting a solid state DC/DC 100-amp rated relay which is not that much larger physically than 25-amp relay. The relay is on the charge line to parallel a pair of Lifelines through a current limited pair of circuits.

This stuff is a LOT more expensive than regular zinc-oxide silicone grease. Frankly I am lost, and would appreciate some advice :)

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Color Silver
Thermal Conductivity
>2W/m-k
Thermal Impedance <0.36?-in2/W
Specific Gravity
>1.6
Evaporation <0.005%
Bleed <0.05%
Dielectric Constant A >5.0
Operation Temperature -50~240?
Silicone Compounds 50%
Carbon Compounds 10%
Metal Oxide Compounds 40%

2 Replies

  • Keep in mind the CPU thermal compounds are just meant to fill in the microscopic imperfections in the metal cpu-> heat sink junction, and not really fill a gap. If the surfaces of the relay and sink are smooth enough, it should work well. Some of the caveats are the surfaces must be *clean* - no oil, wax, etc., which fills the microscopic imperfections, keeping the compound from working well.
    One of the more popular is Arctic Silver (or at least it was 5 years ago).
  • What kind of info are you looking for?

    I assume this is the thermal paste type used for mounting PC processors. How much power does the ss relay dissipate? I assume this will be mounted on some type of heat sink? Does the relay mfg provide any guidance in mounting this component and does it provide theta j-c information so you can calculate junction temp?

    Dick