Best thermal compound?

GC Type 44

Specifications:
Solids content, w.%: 65% minimum.
Thermal conductivity @ 36 °C: 16.7 x 10-4 cal/sec CM, min.
Bleed, 24 hrs. @ 200 °C, wt.%, 0.1% maximum.
Evaporation, 24 hrs. @ 200 °C, wt.%, 0.6%.
Volume resistivity, 1.65x10-14 Ohms/CM.
Dielectric strength, 305 Volts/Mil. Specific gravity at 60 °F, 2.7.
Penetration, 250-350.
Operating range, -40 to 200 °C.

Features

Non-contaminating synthetic ester base. Non-silicone base. Smooth white
homogeneous paste. Excellent heat transfer. No separation or bleed.

Type 44 is recommended as a heat transfer medium for use with all electronic
components such as power transistors, diodes, resistors, etc. Type 44 has a
life expectancy far exceeding than that of all known types of electronic
circuitry in both normal and extreme environments. Latest development in
heat sink compounds, created to meet the need for a non-contaminating and
more efficient thermal transfer compound. Type 44 is a non-creeping
synthetic ester based compound that exhibits virtually no bleed or
evaporation over a wide temperature range, even in a vacuum. Type 44
transfers 46% more efficiency than the best silicone products and 63% better
than most olefin products. Type 44 is the only heat sink compound meeting
Western Electric specifications KS21343 and it exceeds military performance
MIL-C-47113.

"feedhead" wrote in message
...
GC Type 44

Specifications:
Solids content, w.%: 65% minimum.
Thermal conductivity @ 36 °C: 16.7 x 10-4 cal/sec CM, min.
Bleed, 24 hrs. @ 200 °C, wt.%, 0.1% maximum.
Evaporation, 24 hrs. @ 200 °C, wt.%, 0.6%.
Volume resistivity, 1.65x10-14 Ohms/CM.
Dielectric strength, 305 Volts/Mil. Specific gravity at 60 °F, 2.7.
Penetration, 250-350.
Operating range, -40 to 200 °C.

Features

Non-contaminating synthetic ester base. Non-silicone base. Smooth white
homogeneous paste. Excellent heat transfer. No separation or bleed.

Type 44 is recommended as a heat transfer medium for use with all
electronic
components such as power transistors, diodes, resistors, etc. Type 44 has
a
life expectancy far exceeding than that of all known types of electronic
circuitry in both normal and extreme environments. Latest development in
heat sink compounds, created to meet the need for a non-contaminating and
more efficient thermal transfer compound. Type 44 is a non-creeping
synthetic ester based compound that exhibits virtually no bleed or
evaporation over a wide temperature range, even in a vacuum. Type 44
transfers 46% more efficiency than the best silicone products and 63%
better
than most olefin products. Type 44 is the only heat sink compound meeting
Western Electric specifications KS21343 and it exceeds military
performance
MIL-C-47113.



Right the GC Electronics "Type 44" is quite good. I like
Thermalloy Inc.'s "Thermalcote" also, it has simular spec.

Luck,
Ken