Air Permeability Tester

The KES-F8 Air Permeability Tester is designed to quickly and accurately measure the breathability and permeability of a wide range of samples, from those with high permeability, such as stockings, to those with low permeability, such as synthetic leather.

Samples can be mounted in just a few seconds using the handle, and measuring is also incredibly simple.
Measurement data is displayed on a digital panel meter, which helps prevent users from misreading the data.

● Quick and highly accurate measurement using the constant ventilation method

The KES-F8 allows measurement of ventilation resistance. Compared with commonly used measuring methods, the KES-F8 is capable of highly accurate measurements in just a short amount of time. In addition, measurements can also be obtained with minute amounts of ventilation (measurement conditions similar to ventilation conditions when clothes are worn).

Measurement Sample Example

  • Gauze
  • Stockings
  • Synthetic leather
  • Textiles
  • Cotton squares
  • Tissue paper
  • Sanitary products
  • Socks
  • Underwear
  • Insulation
Air Permeability Tester
Measurement Data

■ Ventilation resistance R (kPa·s/m)

Smaller values mean higher breathability and permeability

Ex.: Pantyhose

KES (Kawabata Evaluation) SYSTEM

The Kawabata Evaluation System, centered on Sueo Kawabata, a professor at Kyoto University, and Masako Niwa, a professor at Nara Women’s University, is an objective evaluation method for measuring the texture of clothing fabrics based on the “The Standardization and Analysis of Hand Evaluation” provided by the Hand Evaluation and Standardization Committee of the Textile Machinery Society of Japan.

Air Permeability Tester
Measuring Mechanism
The KES-F8 sends air at a constant flow rate to the sample through the movement of its plunger and cylinder piston. Air can be either discharged through the sample to the atmosphere or sucked in from outside. The pressure when discharging or suctioning air is detected, and the ventilation resistance of the sample (R) is calculated.
Air Permeability Tester
Dimensions/Weight (approx.) Measuring unit: W330 × D495 × H430 (mm) / 25 kg
Power source 100 VAC, Max. power consumption: 40 W
Measurement environment temperature and humidity 20 to 30°C / 50 to 70% RH
(No condensation.) Temperature and humidity kept constant during measurement.
(Standard temperature and humidity conditions: 20°C / 65% RH)
*Installation should be in a location with minimal influence from wind or vibrations.
Pressure sensor Semiconductor-type differential pressure gauge
Measuring method Constant ventilation method (measuring ventilation resistance)
Pressure output sensitivity
(Full scale)
  • 2000 Pa (with standard measurement)
    200 Pa (with high-sensitivity measurement)
Pressure accuracy ±0.5% of full scale
Max. ventilation resistance (R) 25 kPa·s/m (with standard measurement)
Piston speed 2 cm/sec, 0.2 cm/sec (switchable)
Ventilation 4 cc/cm2/sec (at 2 cm/sec)
0.4 cc/cm2/sec (at 0.2 cm/sec)
Vent area 2π cm2
Specimen size Dimensions: 50 × 50 to 100 × 100 (mm) (standard)
Thickness: 1 mm (max.)
*With support for optional accessories
*Specification details recorded here are subject to change without notice. We appreciate your understanding.
Optional Accessories
• Vent pressing plate (20 πcm2, 0.2 πcm2) vent sizes are variable
• Attachment provided for thick samples
*Contact a sales representative for more information.  

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