|Mercury intrusion porosimeter|
|Analytical technique description:||
The technique allows to measure the volume and size of the open pores of the sample by mercury intrusion. Thanks to its non wettability properties, the mercury penetrates through the open porosity of a solid sample only through the application of an external pressure. Measuring the amount of mercury penetrated into the pores of the sample at each increment of pressure, the experimental data from which to calculate the porosimetric distribution of the radius of the pores are obtained.
It’s useful for the microstructural characterization of all stone materials, for an assessment of their degradation and to control the effects of conservative treatments on their porous structure. It’s a technique applicable to any kind of non-metallic material.
The sample, dried and weighed, is placed under vacuum in a dilatometer filled with mercury to which a pressure increase is then applied. The Washburn's equation allows to attribute every single volume of mercury penetrated to a specific pore size. The measuring range is from pores with a radius from 35 to 0.0037 microns.
Thermo Scientific PASCAL 140 e PASCAL 240 (Milan Unit, Rome Unit).