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Description: This Thermal Gap Filler provides 1.1W/mK of thermal conductivity that can conform to most surfaces. It’s perfect for high-value products that you need to keep cool, as it is a poor conductor of electricity while remaining a great conductor of heat! No additional adhesive is required when applying the Thermal Gap Filler, as it is naturally tacky and sticks to whatever you need it to — just be sure that’s where you need it!

This gap filler is what we use on our Stepoko motion controller as well as what we recommend to use with our ESP32 Thing Power Control Shield, as it is both electrically insulating and stable from -40°C to 160°C while meeting a UL 94 VO rating.


  • Soft and compressible for low-stress applications
  • Naturally tacky, needing no further adhesive coating
  • 1.1 W/mK thermal conductivity
  • Comes in 9"x9" sheets


Customer Comments

  • 1.1 W/mK

    That’s presumably watts per meter kelvin, not watts per millikelvin, for anybody who’s not familiar with the specs for this kind of material.

    My understanding of it, which could well be incorrect, is that you divide the contact area in m2 by the thickness in m to get the length value for use in thermal conductivity calculations. For example, if you have a 10 cm square, that’s (0.1 m)2 = 0.01 m2. Then divide that by the thickness, 0.00102 m, to get 9.8 m. Then if you have a temperature difference of 15 K (15 °C), it’s 15 K * 9.8 m * 1.1 W/(m*K) = 161 W.

  • The link to the motion controller in the description just sends you right back to this product…

  • Which thickness is this material? The data sheet lists values in the range of 0.02" to 0.10". Thanks!

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