Permeability and Tortuosity Measurement Sample permeability and tortuosity testing is offered as an extension to our standard Mercury Intrusion Porosimetry analysis and also includes the calculation of bulk density, skeletal density and sample porosity, allowing for porosity and permeability to be measured by a single analysis. This has proven to be particularly applicable and beneficial to a range of materials and areas as an abundance of information is derived in a relatively short time frame. • Geotechnical testing • Hydrology • Petrology • Catalysis • Paper • Pharmaceutical tablet forms • Filter media The calculation of permeability (mD) requires the threshold pressure of mercury intrusion, the bulk sample density and the absolute sample density. The threshold pressure is assessed from mercury intrusion data and the large number of data points generated by our in-house protocols allows for this to be calculated with accuracy. Bulk (envelope) density is also determined from mercury intrusion data whilst the absolute density can be entered either as a known or assumed value for the material or measured using our helium pycnometry option. Sample tortuosity provides a measure of the difference between the actual path length through sample pores and the geometrically shortest distance through the sample. The generation of tortuosity data requires sample permeability and an estimate of the BET Surface Area of the sample. The surface area may be provided from a known or assumed value or can be measured using our BET Surface Area analysis options, applying either nitrogen or krypton adsorption. 

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