Home>Our businesses>Measuring Instruments>Measuring devices for electrochemistry/porous materials>Perm-Porometer

Measuring Instruments


  • Fuel cells (gas diffusion layers, catalyst layers)
  • Non-wovens
  • Papers
  • Building materials
  • Battery separators
  • DPF
  • Water vapor transmission films
  • Hollow fiber membranes


  • Bubble point pore diameter (maximum pore size)
  • Average pore diameter
  • Pore diameter distribution
  • Gas permeability
  • Liquid permeability
  • Envelope surface area
  • Average fiber diameter

Key features

  • Non-mercury
    Enables non-destructive tests without using liquid nitrogen
  • Employs a measurement principle based on ASTM and JIS standards
  • Enables the measurement of pore sizes important to the functioning of high-performance materials
  • Enables the measurement of membrares, cylinders, and hollow fibers
  • Short-time measurement / Easy-to-use
  • Computer-controlled automatic measurement


  • Pore size: 0.015〜600μm
  • Gas permeation rate: 0〜500L/min
  • Water/Methanol permeation rate: 0〜15cc/sec
  • Press compression pressure: 0〜500PSI
  • Software: windows-compliant/Japanese


When air-pressure is added to a liquid-soaked sample and the pressure of the liquid exceeds the liquid surface tension in a capillary tube, the liquid is ejected from the sample. After the minimum pressure required to eject the liquid is measured, the pore size is calculated using the below equation, which is derived from the capillary equation.

D=4γcosθ/P (Washburn’s equation)
P: Pressure, γ: Surface tension of the test solution
θ: Contact angle of the test solution D: Pore size

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