TENSILE STRENGTH – STRETCH AT BREAK
Purpose of the test
This test is performed to determine the tensile strength and stretch at break of paper, solid board or folding board.
Procedure
Operate the instrument in accordance with ISO 1924-2 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Cut 10 samples of 15,0±0,1 mm width, set the test span of 180±1 mm.
Report 10 measures, their mean and standard deviation calculated to 3 significant figures, express the results in µm.
ISO 1924-2
Nr. of samples
12 test pieces per level
Sample size 50 x 250 mm²
Special size A4
Levels
Tensile:
Level 1: 2.50÷3.50 kN/m
Level 2: 4.50÷5.50 kN/m
Level 3: 7.00÷8.00 kN/m
Level 4: 9.50÷11.5 kN/m
Stretch at break:
Level 1: 6.00÷8.0 %
Level 2: 4.50÷5.50 %
Level 3: 1.00÷2.00 %
Level 4: 4.00÷6.0 %
Reporting
Report 20 valid results of measurements for tensile strength in kN/m and Stretch at break in %, their mean and their standard deviation. All to three significant digits.
CEPI test 2.1
2.1(a); strength
2.1(b); stretch
