CONTACT ANGLE
Purpose of the test
This test is performed to determine the Contact Angle of a drop of water on paper, solid board or folding board.
Procedure
Operate the instrument in accordance with ISO TS 14778 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Cut the samples to the dimensions to fit on your device. Record the dimensions in the report sheet under remarks.
Clean the reference sample, Level 1, with a quick drying solvent, e.g. ethanol.
Adjust the device to start measuring immediately after drop-release and with a resolution such that after 0,1 s, 1 s and 10 s a reading can be achieved.
Adjust the drop size to 4 µl.
Make at least 3 measurements per test piece, record a maximum of 20 measures.
Report 10 measures in ° at 0,1 s, 1 s and 10 s, their mean and standard deviation calculated to 3 significant figures.
ISO TS 14778
Nr. of samples
5 test pieces per level (Level 1 only one sample)
No special sizes
Levels
All Times:
Level 1: 55÷75 °
Level 2: 80÷100 °
Level 3: 100÷110 °
Level 4: 125÷135 °
Reporting
Report 10 valid results of measurements in °, their mean and their standard deviation. All to three significant digits.
CEPI test 4.6
4.6; 0,1 s
4.6; 1,0 s
4.6; 10 s