RING CRUSH TEST
Purpose of the test
This test is performed to determine the ring crush resistance of corrugated board.
Procedure
Operate the instrument in accordance with ISO 12192 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Cut out 10 test pieces 12.7×152 mm² from the middle of each sheet, edge strips are not to be used.
Measure the thickness of the test piece and determine the dimension of the central island.
Place the strips in the sample holder with the marked side outwards.
Measure the RCT on 10 test pieces
Report 10 measures in kN/m, their mean and standard deviation calculated to 3 significant figures, express the results in µm.
ISO 12192
Nr. of samples
12 test pieces per level
Special size A4, A3
Levels
Level 1: 0.60÷1.00 kN/m
Level 2: 1.60÷2.10 kN/m
Level 3: 3.10÷3.90 kN/m
Reporting
Report 10 valid results of measurements in kN/m, their mean and their standard deviation. All to three significant digits.