Liquid-Liquid Porometer


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Liquid-Liquid Porometer

Designed for pore structure characterization of materials such as hollow fibers, flat sheet membranes, filter media, ceramics having very small pore sizes. It is capable of measuring pore diameters, pore size distributions and liquid flow rates of materials having very low permeability.

The Liquid-Liquid Porometer uses two immiscible & saturated wetting liquids with low interfacial tension. The selection of low interfacial liquids allow to measure open pores down to 3 nm at relatively low pressures. The pores are filled with a first liquid and the second liquid is pressurized to displace the first liquid and flow through the pores. The amount of liquid flowing out is measured. Then the second liquid flow rate and differential pressure are measured. The pore distributions are computed similar to a capillary flow porometer.


The determinable pore size dependent properties include:

  • Mean Pore Size
  • Pore Size Distribution
  • Bubble Point (Largest Pore)
  • Pressure Hold Test
  • Gas Permeability
  • Cumulative Filter Flow

Literature and Norms

/1/ ASTM D6767
/2/ ASTM E128
/3/ ASTM F316
/4/ DIN ISO 4003:1990
/5/ DIN 58355-2:2005
/6/ ISO 2942
/7/ Particle World 20; p. 30-32; “Characterization of through-pore systems with PMI-Porometers”
/8/ Particle World 19; p. 36 – 37; “Now Available: Liquid-Liquid-Porometry for materials with very small through-pores”

Other Pore Size Analyzers:

iPore Porometer series1 Station Analyzer
3P micro 1001 Station Analyzer
3P micro 2002 Station Analyzer
3P micro 3003 Station Analyzer
3P meso 1121 Station Analyzer
3P meso 2222 Station Analyzer
3P meso 4004 Station Analyzer


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