Function of microporous systems

Porextherm WDS® has extremely low heat transfer rates, even below still air. It consists of exclusive inorganic oxide substances and does not contain any harmful components. Our product prevents the three types of heat transfer perfectly:

Heat conduction, Convection and Heat radiation

These mentioned types of existing heat transfers are responsible for the total thermal conductivity value of an insulation material. Lambda describes the insulation material effectiveness. A material with a low thermal conductivity value (Lambda) has a good insulation performance; one with a high value fulfils the precondition for good heat transfer.

Heat conduction

Heat conduction describes the heat transfer in solids. Because of the molecule structure of the microporous material and the fact that all particles are spherical, the points of contact between particles are infinitely small. The outcome is a very low solid phase conduction.


When molecules collide with each other, heat moves through gases via exchange of energy. The cell structure of the microporous material with an average pore size of roughly 20 nm, is smaller than the mean free length of path of the gas molecules. Due to collision of molecules, the exchange of energy between the molecules is reduced to a minimum.

Heat radiation

Heat radiation takes place by electromagnetic waves and gains in importance with increasing temperatures (>400 °C). By adding infrared absorbing materials to the microporous silica mixture, the fraction of this heat transferring phenomenon is significantly reduced.

In summary, we can say that compared to all other conventional heat insulation materials, microporous heat insulation systems minimize all three above described heat transfer mechanisms in an exceptional way.