Air Permeability Tester

The Akustron measures the air porosity of filter paper, non-wovens and textiles. Very fast and repeatable benchtop test taking only 3 seconds per measurement.

The Akustron Air Permeability Tester measures the air permeability of filter papers, non-wovens and textile fabrics. Easily transportable, this unit is ideal for monitoring material on the production line, inspecting incoming material on-site and on-going quality control in the laboratory. Constructed of rugged materials, the Akustron readily withstands the demands of constant usage.

Automated testing ensures there are no user-induced variables. The sample is inserted, a lever is pulled to clamp it and the testing begins automatically.

The method of measurement is based on two, long-life approved speakers. The speaker in the lower enclosure generates an oscillating air column, which displaces air through the test sample. A second speaker in the upper enclosure works as a sensor and measures the amount of air that passes through the clamped sample. The measurement is completed in approximately 3 seconds and the results are shown immediately on the integrated digital display.


  • Hand lever initiated automated testing
  • Two brass test plates for accuracy verification
  • 14.2 mm high digital display
  • Quick and easy to use
  • Results displayed after 3 seconds from the start of the test
  • RS-232 interface for sending test data directly to a PC and the bespoke Akustron software or an existing quality control program

Physical specifications

  • Dimensions – 16 x 27 x 20 cm (W x L x H)
  • Net weight – 5 kg
  • Sample dimensions – Size 5 x 12 cm minimum, Thickness 3 mm maximum

Performance data
Measurement range

Air permeability between 4 and 400 cfm (cu ft/sq ft min) at ∆p = 0.5 in H2O = 127 Pa
30-3000 l/m2 at ∆p = 200 Pa
30-3000 mm/s at ∆p = 200 Pa

Power requirements – 110-120/220-240 V, 50/60 Hz
Power usage – 30 V/A
Power fuse – 500 mA

In accordance with DIN 53887, 53120, ISO 9237, ASTM D737-96

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