Specifically designed by Gurley for measuring the porosity of very porous non wovens textile sheets. Results expressed in cubic feet/ minute.

Specifically designed by Gurley for measuring the porosity of very porous sheet materials – non-wovens / textile sheets / filter paper.

The Gurley Model 4301 Permeometer measures the porosity or air permeability of materials where air flow is an important characteristic. Typically they are non-woven or woven textiles, filter and tissue papers, facial tissues, paper and cloth felts, some types of blotting, saturating and absorbent bag papers as well as wire meshes.

The Permeometer is the standard instrument for measuring high levels of air-permeability or air-resistance and complies with   ASTM, TAPPI and ASA test standards. Its unit of measurement is cubic feet of air per minute per square foot at 0.5 inches of water pressure drop.


  • Quick & easy sample loading
  • Rapid test cycle
  • Excessive clamping pressure unnecessary
  • Portable & rugged design
  • Depth 150 mm throat.
  • Complies with Conform to TAPPI T-251, ASTM D-737, DATM 70.0-70 and ISO 5636/1.


  • to determine ability for material to pass air as a primary user requirement (such as parachute cloth or vacuum cleaner bags).
  • to evaluate materials used as filters.
  • aid in determining coolness or warmth (as insulation values) in clothing.
  • to predict probable coating penetration.
  • to measure retention of filters, sizing or scratch after laundering or use.
  • to aid in prediction of water-resistant properties.
  • to measure the effect of treatments on porosity, density, nap or other material properties.
  • allows fast & easy quantitative measurement of variables in production not detectable by appearance or other methods.
  • a non-destructive test to accurately delineate & quantify differences in materials and treatments.

For further information please contact our sales team on 01223 492081 or via