ASTM D2534 Standard Test Method for Coefficient of Kinetic Friction for Wax Coatings
10. Procedure
10.1 Lay down two strips of double-faced adhesive tape along the length of the plane so that they are approximately 100 mm (4 in.) between centers.
10.2 Attach the 250 by 130-mm specimen to the double-faced tape on the horizontal plane.
NOTE 2 - For wax-coated paper, make the attachment so that the specimen is free of wrinkles.
10.2.1 For wax-coated paper, tape the ends of the 120 by 25 mm (5 by 1 in.) specimen to the top of the sled, pulling the specimen tightly across the sliding surface to eliminate wrinkles.
10.2.2 For wax-coated paperboard or corrugated board, place a strip of double-faced tape on the bottom face of the sled. Place the 75 by 25-mm (3 by 1-in.) specimen against the tape, square with the sled and with the bevel-cut edge at the handle end. The bevel cut on the leading edge reduces the possibility of the sled specimen plowing into the base specimen.
10.3 Set the sled lightly in position at the rear end of the 250 by 130-mm (10 by 5-in.) specimen and in line with the pulley. Attach the sled by means of the handle to the cord. This pulling cord passes from the sled handle, underneath and around the pulley vertically to the load cell.
10.4 Start the lower crosshead horizontal plane assembly moving downward at a speed of 900 mm/min (35 in./min).
10.5 Record in grams the average reading during the 152 mm (6 in.) of travel after the first 13 mm (0.5 in.). After the sled has traveled 178 mm (7 in.), stop the apparatus. Return the crosshead to the starting position.
11. Calculations
11.1 Calculate the coefficient of kinetic friction, µk, as follows:
µk = A/B
where:
A = average scale reading for 150 mm (6 in.) of uniform sliding, and
B = sled weight, g.
