Noun
heat conductivity (countable and uncountable, plural heat conductivities)
thermal conductivity
heat-conductivity
Industrial diamonds are valued mostly for their hardness and heat conductivity, with the gemological qualities of clarity and color being mostly irrelevant. Source: Internet
Concrete buildings are more resistant to fire than those constructed using steel frames, since concrete has lower heat conductivity than steel and can thus last longer under the same fire conditions. Source: Internet
The low heat conductivity of some quasicrystals makes them good for heat insulating coatings. Source: Internet