AIR PERMEANCE – Bendtsen
Purpose of the test
This test is performed to determine theair permeance of paper according to Bendtsen.
Procedure
Operate the instrument in accordance with ISO 5636-3 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Make a measurement in the middle of each test piece (pressure 1.47 kPa, manostat 150) 20 measurements with the marked side towards the air flow.
Report 10 measures in ml/min, their mean and standard deviation calculated to 3 significant figures.
ISO 5636-3
Nr. of samples
22 test pieces (2 reserves) per Level.
ca. 140 mm x 210 mm
Special size A4
Levels
Level 1: 5.00÷35.0 ml/min
Level 2: 110÷160 ml/min
Level 3: 400÷500 ml/min
Level 4: 1500÷2000 ml/min
Reporting
Report 10 valid results of measurements in ml/min, their mean and their standard deviation. All to three significant digits.
Cepi test 5.2
