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Air Permeability Tester | A smart instrument developed by the sister company ChiuVention.

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The Air Permeability Tester gives you fast, reliable air permeability test results. It is a smart instrument. You can set parameters and monitor the test from your smartphone. This greatly improves work efficiency. This permeability apparatus is for many textiles. It includes technical fabrics and non-woven fabrics. It also has other breathable products, like sponges and paper. It is also for testing the air permeability of other materials. It applies to GB/T5453, ISO 9237, ISO 9073:2015, JIS L1096 Item 8.26 Method C, BS 3424-16, BS 6F 100 3.1, NWSP 070.1.RO(15), and GB/T 24218.15.

The air passes through the fabric. This forms a pressure difference between its front and back. We measure the air that passes through the fabric. This happens under a certain pressure difference. This gives us the air permeability value.

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Description

 

Tests are easy and fast.

The  Air Permeability Tester is easy to operate, you can select the test standards and measurement units from the operation screen. The instrument can automatically recognize the different ranges of the test fixture head. You can start the permeability test and get the result directly.

More reliable test results

In an innovative test model, the range conversion components are maintenance-free and have no loss, bringing high repeatability and reliability to air permeability test results. High-quality core components, such as pressure sensors from famous brands, further ensure the accuracy of the air permeability test results.

Smart instrument

You can connect the Air Permeability Tester with the SmarTexLab App installed in smartphones through Wi-Fi, then you can set parameters, monitor the test status, receive equipment warning reminders, etc., and share air permeability test results with the quality control department or brand buyers.

 

Application

An Air Permeability Tester is widely used to test the resistance of fabrics to the passage of air. This includes woven, knitted, and non-woven textile materials, as well as medical masks. The test textile is firmly clamped by a specified rig to resist the constant air pressure.

The specimen is loaded to the test area of the instrument easily using an automatic holder. Press down the holder to start the test. The air permeability testing machine has a vacuum pump. It uses the pump to draw air through an automatic test head. The head has a circular opening. The machine keeps the pre-set test pressure. After a few seconds, the panel shows the air permeability of the test specimen in the chosen unit. Or, it shows which test nozzle to replace. After the air permeability test, release the holder. Then, shut off the vacuum pump.

 

The Specifications of  Air Permeability Tester

Measurement units:  mm/s, m/s, l/m²/s, ft³/min/ft², cfm, cm³/s/cm², l/s/cm², l/m²/min

1/dm²/min ,l/min, m³/min, dm³/s

m³/s/m², m³/min/m², m³/h/m², ft³/s/ft²

Test  Mode Automatic
Test head 20 cm²  (standard)
Test pressure 10 ~ 2,500  Pa
Air velocity 0.6 ~ 10,000  mm/s  (20  cm²)
Measurable sample thickness range 0 ~ 10 mm (other thicknesses and fixtures can be customized)
Testing  Accuracy < +/-2%
Optional test heads 5 cm²,  25 cm²,  38 cm²,

50 cm², 100 cm²

Weight of Air Permeability Testing Machine

125kg

Power of Air Permeability Testing Machine

220V/110V  50/60Hz

Dimension of Air Permeability Testing Machine

970*400*970 mm (D*W*H)

Standards of Air Permeability Testing Machine

GB/T 5453  ISO 9237

ISO 9073:15  JIS L1096 Item8.26 Method C

BS 3424-16  BS 6F 100 3.13

NWSP 070.1.RO(15)  GB/T 24218.15

 

Optional Standard of Air Permeability Testing Machine

ASTM D737

 

TESTEX provides good quality air permeability testers for textiles, for more information on air permeability test apparatus, or want to know the air permeability tester price or air permeability test standards, please contact us now! You can also directly have a nice chat with us via the What’s App.








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    Frazier air permeability test method (ASTM D737 testing)of textiles


    1.Air permeability definition

    What is the permeability of air? The air permeability is the volume of air passing a fabric under pressure. There are two types of air permeability tester for textiles, Frazier air permeability tester and Shirley air permeability tester. In ASTM D737 test method, we take Frazier differential pressure air permeability tester as an example.

    2.Test Objectives:

    To determine the air permeability of textile fabrics by calculating the air permeability value.

    3.Test Materials:

    Woven, knitted and non-woven textile materials. eg.  cotton.

    4.Air Permeability Test Procedure:

    4.1 The specimens must be adjusted to the standard atmosphere with  21 +/- 1°C (70 +/- 2°F) and 65 +/- 2 % relative humidity unless there is otherwise specification of contract order.

    4.2 Process the specimens carefully and prevent it from changing its' natural state.

    4.3 Place each specimen on the test head of the air permeability tester and control the test as the operation manual.

    4.4 At the conditioned water pressure, making tests according to the operation manual. In the absence of an operation manual, use a water pressure 125 Pa (12.7mm or 0.5 in. of water).

    4.5 Read and record the test results. The air permeability units should be noted. Record the test results respectively in SI units as cm^3/s/cm^2 and in inch-pound units as ft^3/min/ft^2 rounded to three significant digits.

    4.6 Take out the tested specimen and continue to test the next specimen until the ten specimens have been tested in accordance with the flow of 4.3-4.5.

    4.7 In order to make sure a high accuracy, the number of tests is at least four.

    5.Air Permeability Calculation

    Calculate air permeability of every specimen by reading directly from the tester in SI units as cm^3/s/cm^2 and in inch-pound units as ft^3/min/ft^2, rounded to three significant digits. Please follow the instructions which the manufacturer provides when calculating air permeability.

    Note-If air permeability test results are 600m (2000 ft) above the sea level, it needs correction factors.

    6.Report

    The data which is needed to report is as follows.

    6.1 Report whether the air permeability is in accordance with the Test Method D737.

    6.2 Report the standard deviation and the variation factor while calculating.

    6.3 The difference in pressure of fabric surfaces.

    6.4 Report the model and the manufacturer of the air permeability test equipment.

    What important points should be paid attention to when measuring air permeability?


    1 Calibration board must be used before each test (all boards should be checked). Mainly air circuit, liquid circuit, air leakage, liquid leakage, position moving will cause an error to the air permeability tester.

    2 The sample should be fixed at the intake hole naturally and smoothly. Usually, it does not need to distinguish between positive and negative, but if the positive and negative differences of structures (such as umbrella cloth, filter cloth, pile fabric) are big, air flow direction should be decided according to the actual use.

    3 The caliber is selected in order of large to small to avoid the excess of liquid in the pressure gauge. The final selected caliber should be under the indication range of the 15%~85%.

    4 Moderate pressure regulation makes the pressure gauge slowly change from low value to constant pressure value. If the liquid level has exceeded the constant pressure value, it must be adjusted back to a lower pressure level and re-adjusted. The pressure has to be stable for a period of time and then can be read.

    5 Make sure that the end of the pressure gauge passes through the atmosphere without clogging. Some instruments have covers and should be taken down when measuring.

    6 There is a nonlinear relationship between the air permeability and the differential pressure of two sides of the fabric (constant pressure value). The air permeability under differential pressure can be compared according to the following formula:

    Q_M=Q_N(∆P_M/∆P_N)^b

    The air permeability under the same differential pressure is converted, Q_M and Q_N of which are the air permeability under the constant pressure value of ∆P_M and ∆P_N, and the B is determined by the fabric category and ∆P_N.

    7 Different countries have different air permeability unit of measurement. Therefore, please pay more attention to the air permeability units conversion. If you need to convert 1/ dm^2/min to m^3/ m^2/ minor convert l/ dm^2/ min to l/ m^2/ s, here is the air permeability conversion chart as follows for your reference.



    Please contact us if you want to know the air permeability tester price or download a free ASTM D737 test for permeability PDF.

     

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      Q: What's the air permeability of fabric?

      A: The fabric air permeability is to measure the volumn of air flow through it. The ease or passage of air plays an important role in end uses of many fabrics, such as industrial filters, tents, sailcloths, parachutes, raincoat materials, shirtings, downproof fabrics and airbags.

      Air permeability refers to the volume of air per ml which passes the fabric at a speed of 1s or 10s/mm^2 in a pressure difference of 10mm water head.

       

      Q: How to test the air permeability of fabric?


      A: In British standard test, the volume of airflow through a specified area is measured at a certain pressure across the fabric with 10mm water head. Test sample is clamped over the inlet of device with rubber gaskets, and air is sucked through it by pumps, which is shown in Fig.A. The air valve is adjusted to exert pressure on air going through fabric of 10mm water head, then a flow meter is used to measure airflow.air permeability test

      Fig(A) : The air permeability test (click here for more)

       

      Q: What is the unit of air permeability of fabric?


      A: The formula is as follows:
      K (gas) = Q / (ΔP × A)
      Where: K( gas) - air permeability, m ^ 3 / m ^ 2 · KPa · h;
      Q - gas flow, m ^ 3 / h;
      ΔP - gas through the porous material produced by the pressure drop, KPa;
      A - area of the sample's test area, m ^ 2

       

       

       

       







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