Air Permeability

he Low Pressure Air Permeability Machine was developed by the National Institute of Standards and Technology of measuring the air permeability of textile type materials. and It is the acknowledged standard of the U.S. Government and the U.S. Textile Industry.


The second model, High Pressure Air Permeability Machine is produced on the same principle as the Low Pressure Machine, but designed with a much greater versatility for use through its higher attainable airflow and differential pressure. Both models are extremely accurate and reliable, very easy to operate, and nearly maintenance free.

These machines were originally developed for measuring the air permeability of textile materials and are, in fact, the standard air permeability testing machines in the industry for quality control, research, development, performance and purchase specifications. It was quickly discovered that these machines are equally adaptable for measuring the air permeability with great accuracy and precision of any material that can be fitted to the physical dimensions of the machine. These materials include all fiber products such as paper, felt, nonwoven materials, filter’s and even wire cloth.

The New Frazier 2000TM Air Permeability Tester

The Frazier 2000TM is the next generation of Differential Pressure Air Permeability Instruments. This new instrument implements electronic pressure sensing as well as computerized logging and manipulation of the electronic measurements. The Frazier 2000TM brings a whole new era of reliability and productivity to the field of permeability testing and measurement. The Frazier 2000 TM has all the same features of the High Pressure Permeability Instrument.




Calibration of Air Permeability Instruments

The Differential Pressure Air Permeability Machines are exclusively calibrated by two separate methods for accuracy and reliability to insure that all permeability Machines are as identical as possible in their performance characteristics and accuracy. The calibrations include the procedures originally developed and recommended by the National Institute of Standards & Technology.

In addition to the calibration, a test plate is provided to quickly and easily check individual machines and cross check between different machines and accuracy and reliability of the Permeability Machines. These test plates have been used successfully over 25 years by a Task Group of the ASTM Committee D-13 as an inter-laboratory comparison to verify the accuracy of the Air Permeability Machines.