COËFFICIENT of FRICTION – Inclined Plane Method

This test is performed to determine the Coëfficient of Friction of paper, solid board or folding board.

Operate the instrument in accordance with UNI 9802, DIN 53119-2 or NF Q 03-083 and the manufacturer’s instructions.

Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.

Cut 2 x 10 test pieces (one test piece for the sled and one for the inclined plane) according to the standard, with the longer side parallel to the long side of the sheet.

Place the marked side (top of the stack, face-up) on the table, with the arrow in the direction of the sled movement (i.e. downward on the ramp).

Mount the next sheet with the marked side (top of the stack, face-up) on the sled. Determine the coefficient of friction with the marked sides against eachother.

Read the angle of the plane at the moment that the sled starts to move.

Determine the static coefficients of friction, COF, by calculating the tangent of the angle at which sliding began.

Report 10 measures, their mean and standard deviation calculated to 3 significant figures.