Tflex HP34 - 34W/mK !!!

Thermal Conductivity 34W/mK, Hardness (Shore 00) 50.00, Grey  

Tflex™ HP34 is an exceptional gap filler product with a thermal conductivity of 34 W/mK. Tflex HP34 is a non silicone formulation containing aligned graphite materials. Compared to typical graphite-based materials, Tflex HP34 is considerably softer with excellent deflection properties.

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https://www.atd-shop.com/qx713453/tflex-hp34-34w-mk-hardness-_shore-00_-50