Porosimetry is the study of the internal pore structure of materials, the volumes, diameters, percent porosity and ideally the pore size distributions.

Porosity like surface area is an important physical property that determine the quality and utility of many materials.

Differences within the material, which otherwise may have the same physical dimensions, can greatly influence its performance characteristics.

Traditionally we use Mercury as a non-wetting fluid to pervade large pores and we squeeze or intrude the Hg with increasing pressures from atmospheric up to 60,000 psi to cover a distribution of pore sizes.

Mercury intrusion works with macropores and mesopores with diameters down to 3 nm. Microporous materials (below 2nm) are too small for Hg intrusion and so Micropores are measured with Nitrogen in physisorption experiments at very low pressures.

S. Seal, L. L. Hench, David Reid (G), Ian Goldstein, University of Central Florida

Porous Fly Ash Particle by Seal, Hench, Reid, Goldstein, University of Central Florida


  pore structure




pores and names ( porosimetry)






Products Technology
Autopore IV web link Mercury Porosimetry
ASAP 2020 Gas Porosimetry (Micro to Meso)
3Flex Pycnometry
Tristar II
Porosimeter selector