TENSILE STRENGTH – STRAIN AT BREAK – 20 mm/min
Purpose of the test
This test is performed to determine the tensile strength and strain 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 to 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 sheets (2 reserves), per Level.
Sample size 50 x 250 mm²
Special size A4
Levels
Tensile:
Level 1: 1.50÷2.50 kN/m
Level 2: 4.50÷5.50 kN/m
Level 3: 6,50÷7,50 kN/m
Level 4: 9.50÷11.5 kN/m
Strain at break:
Level 1: 5.00÷7.00 %
Level 2: 1.00÷2.00 %
Level 3: 1.50÷2.50 %
Level 4: 4.00÷6.0 %
Reporting
10 valid results in kN/m, calculate the mean and standard deviation to 3 significant figures.
CEPI test 2.1
2.1(a); strength
2.1(b); stretch
