Last reviewed: October 4, 2026

Critical Method Distinction

Porosimetry vs Porometry

Understand the fundamental difference between total pore characterization (porosimetry) and through-pore analysis (porometry) for optimal method selection.

View Key Differences Decision Guide

Porosimetry

Measures All Open Pores

Through + Blind (open) pores
Through pores Blind pores Closed pores (only by scattering/density)
  • Mercury intrusion
  • Gas adsorption
  • Small angle scattering
  • Total porosity measurement

Porometry

Measures ONLY Through Pores

Through Pores Only
Measured Not detected
  • Capillary flow porometry
  • Liquid-liquid porometry
  • Bubble point test
  • Permeability analysis

Key Differences

Fundamental distinctions between porosimetry and porometry methods

Aspect Porosimetry Porometry
Pore Types Measured All open pores: through and blind (dead-end). Closed pores are invisible to mercury and gas; they need scattering (SAXS/SANS), imaging, or a comparison of skeletal and true density Only through (permeable) pores
Primary Techniques • Mercury intrusion (MIP)
• Gas adsorption (BET/BJH)
• Small angle scattering 		• Capillary flow porometry
• Liquid extrusion
• Bubble point method
Measurement Principle Volume/surface area based Flow/permeability based
Size Range 0.3 nm - 500 μm (technique dependent) 0.02 - 500 μm (typically)
Information Obtained • Total porosity
• Pore size distribution
• Surface area
• Pore volume 		• Through pore size
• Permeability
• Bubble point
• Flow distribution
Sample Requirements Can be powder, bulk, or membrane Must be permeable (typically membranes/filters)
Typical Applications • Catalysts
• Adsorbents
• Ceramics
• Building materials 		• Filtration membranes
• Separation media
• Textiles
• Paper products
Connectivity Information Limited (requires advanced analysis) Direct measurement of connected paths
Sample Integrity May alter sample (MIP) or non-destructive (gas) Generally non-destructive
Analysis Time 2-24 hours typically 15-60 minutes typically

When to Use Each Method

Use Porosimetry When:

  • Total porosity determination is required
  • Characterizing catalysts or adsorbents
  • Analyzing powder materials
  • Studying blind (dead-end) pore systems
  • Determining surface area is critical
  • Material has significant internal porosity
  • Quality control of bulk materials
  • Research on pore formation mechanisms

Use Porometry When:

  • Flow characteristics are paramount
  • Testing filtration membranes
  • Permeability assessment needed
  • Only through pores matter for application
  • Quick pass/fail testing required
  • Determining filter ratings
  • Quality control of separation media
  • Predicting fluid transport behavior

Decision Guide

Follow this flowchart to determine the optimal method for your application

Start Is your application focused on fluid flow or permeability? YES Are you analyzing membranes or filters? Use POROMETRY NO Need total porosity or surface area data? Material type? Powder / Bulk / Membrane Gas Adsorption (BET/BJH) Mercury Intrusion (MIP) Consider Combined Approach

Combined Approach Benefits

Many applications benefit from using both porosimetry and porometry

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Complete Characterization

Combines total porosity data with flow-relevant pore information for comprehensive material understanding.

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Tortuosity Insights

Comparing total open porosity with through-pore flow data helps you judge how much pore volume is dead-end and how connected the network is.

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Performance Prediction

Correlate structural properties with functional performance for improved material design.

Example Workflows

Ultrafiltration Membranes

Challenge: Optimize retention and flux

Solution:

  • Porometry (gas–liquid or liquid–liquid): through-pore size and defect detection in the selective layer
  • MIP: pore structure of the macroporous support
  • Retention (MWCO) and flux are measured separately with solute and permeation tests

Battery Separators

Challenge: Balance ion transport with safety

Solution:

  • Porometry: through-pore size distribution and mean flow pore of the separator
  • MIP or gravimetric methods: total porosity
  • Air permeability (Gurley) and ionic resistance link the structure to cell performance

Relevant Standards

Porosimetry Standards

  • ISO 15901-1:2016 - Mercury porosimetry
  • ISO 15901-2:2022 - Gas adsorption (micro- and mesopores, “nanopores”)
  • ISO 9277:2022 - BET surface area
  • ASTM D4284-25 - MIP for catalysts and catalyst carriers
  • ASTM C1069-09(2022) - BET surface area of alumina or quartz

Porometry Standards

  • ASTM F316-03(2019) - Bubble point and mean flow pore of membrane filters
  • ASTM E1294-89 - Automated liquid porosimeter for membrane filters (withdrawn 2008)
  • ISO 4003 - Bubble test pore size of permeable sintered metals
  • ASTM D6767 - Pore size of geotextiles by capillary flow test
  • ISO 2942:2018 - Integrity and first bubble point of hydraulic filter elements

Key Takeaways

Porosimetry

  • Measures all open pores (through and blind)
  • Provides total porosity and surface area
  • Best for catalysts, adsorbents, bulk materials
  • Uses MIP and gas adsorption (SAXS/SANS add closed pores)

Porometry

  • Measures only through (permeable) pores
  • Provides flow and permeability data
  • Best for membranes, filters, separation media
  • Uses capillary flow, bubble point techniques

Remember: The choice between porosimetry and porometry depends on your specific application requirements. Many advanced characterization protocols benefit from using both approaches to gain complete material understanding.

Continue with method selection

Porosimetry and porometry answer different questions. The MIP-versus-gas-adsorption comparison is the next step inside porosimetry, and the calculators on this site cover Washburn pore size, BET surface area, and bubble-point pore size.

MIP vs. Gas Adsorption Open the Calculators