TEAR GROWTH – Brecht-Imset
Purpose of the test
This test is performed to determine the tear growth of paper, solid board or folding board.
Procedure
Operate the instrument in accordance with DIN 53115 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Measure the tear growth on 10 test pieces with the marked side to the slide. Eliminate measurements with unequivocal slant tears.
Report 10 measures in mNm/m, their mean and standard deviation calculated to 3 significant figures, express the results in mNm/m.
DIN 53115
Nr. of samples
12 test pieces per level
Sample size 60 x 90 mm²
Special size A4
Levels
Level 1: 450÷550 mNm/m
Level 2: 900÷1200 mNm/m
Level 3: 1240÷1440 mNm/m
Reporting
Report 10 valid results of measurements in mNm/m, their mean and their standard deviation. All to three significant digits.