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Dowsil 340 – Heat Sink Compound

Dowsil 340 is a non-flowing, white heat sink compound with good thermal conductivity.

Dowsil 340 – Heat Sink Compound

DowSil 340 is a non-flowing white heat sink compound with good thermal conductivity. This product is applied to the base and mounting studs of silicon-controlled transistors, diodes and rectifiers. 

Dowsil 340 Benefits

Below we list the benefits of the product:

  • High thermal conductivity
  • does not flow
  • Stable at elevated temperatures
  • heat conducting compound
  • monocomponent
  • No need for ovens for the cure
  • Increases reliability with heat flow away from circuit components


Here we present the main properties of the product:

  • White colour
  • Thermal conductivity – 0.67 W/m・K
  • Specific Gravity at 25C – 2.1
  • Storage – 1800 days
  • Viscosity – 542000 mPa.s

Dowsil 340 Applications

This product is designed for the thermal coupling of electrical devices and heat sink PCB assemblies that require cooling. It is also suitable for aeronautical engines that require heat dissipation properties.

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