GLOSS 75° – converging beam
Purpose of the test
This test is performed to determine the gloss at 75° (TAPPI gloss) of paper, solid board or folding board.
Procedure
Operate the instrument in accordance with ISO 8254-1 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Make five measurements in the machine direction (longer side parallel to the MD) and five measurements in the opposing direction.
Report 10 measures in %, their over-all mean and standard deviation calculated to 3 significant figures.
ISO 8254-1
Nr. of samples
12 test pieces per level
Sample size 100 x 200 mm²
Special size A4
Levels
Level 1: 20.0÷40.0 %
Level 2: 70.0÷85.0 %
Reporting
Report 10 valid results of measurements in %, their mean and their standard deviation. All to three significant digits.