TEARING RESISTANCE – ELMENDORF
Purpose of the test
This test is performed to determine the tearing resistance of paper, solid board or folding board accoring to the Elmendorf method.
Procedure
Operate the instrument in accordance with ISO 1974 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Select and cut 10 pads of 4 test pieces so, that the tearing direction is in the direction of the arrow. Measure the tearing resistance on 5 pads with the upper side towards the knife and 5 pads with the bottom side towards the knife.
Report: 10 measures, their mean and standard deviation calculated to 3 significant figures, express the results in mN.
ISO 1974
Nr. of samples
Sufficient paper for 12 pads of 4 test pieces (2 reserves), ca. 100 mm x 90 mm, per Level.
Special size A4
Levels
Level 1: 280÷340 mN
Level 2: 500÷900 mN
Level 3: 1500÷2000 mN
Level 4: 2000÷2500 mN
Reporting
10 valid results in mN, calculate the mean and standard deviation to 3 significant figures.