Advanced Bendsten Permeability and Surface Roughness Tester

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The PMI fully automated Advanced Bendsten Permeability & Surface Roughness Tester is able to measure air permeability and smoothness according to standards ISO 28791-2 and permeability to ISO 5636-3 and 5 with digital display.


The Advanced Bendsten Air Permeability and Surface Roughness Tester is used to determine the permeability and surface roughness of porous solids. A gas such as air is forced to flow through the test sample. Measurements of the steady-state flow rate and the corresponding pressure drops provide the necessary data for calculation of the permeability using darcy and other units.


Industries worldwide utilize permeability and surface roughness testers for R&D and quality control.

Applicable industries include:

  • Automotive
  • Battery
  • Biotechnology Separator
  • Ceramic
  • Filtration
  • Fuel Cells
  • Geotextiles
  • Nonwovens
  • Paper
  • Textiles


  • Windows-based software handles all control, measurement, data collection, and report generation; complete manual control also possible
  • Comes with computer equipped with real-time graphical test display depicting testing status and results
  • Non-destructive testing
  • Length of text: approximately one minute
  • Wide range of acceptable sample types and sizes
  • Multiple sample chambers available
  • Minimal maintenance required
  • Units in Darcy, Frazier, Gurley, and many others
  • Completely automated air permeability tester
  • Pneumatic clamping

Optional Features

  • Permeability measurement of high flow rate samples
  • Permeability of samples under compressive stress
  • Use of elevated test temperatures and a wide variety of gases


Bendsten Roughness Value Range

50 mL/min

500 mL/min

Air Permeance Range



0.1 µm/(Pa•s)

100 µm/(Pa•s)

Sample Size 100mm x 100mm
Pressure Range Up to (127 ± 0.02)kPa
Pressurizing Gas

Clean, dry or compressed air

Any other nonflammable and noncorrosive gas

Pressure Transducer Range 0 - 200 kPa
Reservoir Volume 150 litres
Pressure Controller 1.47 ± 0.02 kPa
Accuracy 0.15% of reading
Mass Flow Transducer Range

5-150 ± 2 ml/min

50-500 ± 5 ml/min

300-3000 ± 20 ml/min

Power Requirements 220-230V, 50Hz
Dimensions 30" H x 19" W x 18.5" D
Weight 100lbs