AIR PERMEANCE – Gurley
Purpose of the test
This test is performed to determine theair permeance of paper according to Gurley.
Procedure
Operate the instrument in accordance with ISO 5636-5 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 with the marked side turned towards the air flow.
Report 10 measures in s, their mean and standard deviation calculated to 3 significant figures.
ISO 5636-5
Nr. of samples
12 test pieces per level
Special size A4
Levels
Level 1: 35.0÷55.0 s
Level 2: 60.0÷100 s
Level 3: 400÷650 s
Reporting
Report 10 valid results of measurements in s, their mean and their standard deviation. All to three significant digits.