ASTM D2534 Standard Test Method for Coefficient of Kinetic Friction for Wax Coatings
6. Apparatus
6.1 Sled Assembly, as shown in Fig. 1, weighing 180 +/- 1 g, and consisting of the following parts:
6.1.1 Brass Block, 25 mm (1 in.) wide by 13 mm (1/2 in.) thick by 75 mm (3 in.) long,
6.1.2 Microscope Slide, cemented to one surface, 25 mm (1 in.) by 75 mm (3 in.), and
6.1.3 Detachable Handle, using 1.5 mm (1/16 in.) weld rod.
6.2 Horizontal Plane Assembly and Pulling Device, consisting of a metal or wood sheet covered by a smooth, flat piece of glass approximately 150 by 300 mm (6 by 12 in.). The plane shall be supported by two 250 by 300-mm (10 by 12 in.) diagonal shelf-brackets. A board attached across the brackets shall be clamped in the jaws of the lower crosshead of an electronic load cell-type tension tester. Adjust the assembly so that the glass surface is level. Attach a low-friction pulley at the edge of the plane with the outer side centered directly beneath the load cell of the testing machine and the bottom side level with the sled handle. Connect the sled handle to the load cell of the tester by a light, flexible metal cable or polyester cord passing around the pulley.
6.3 Low-Friction Pulley, consisting of a pulley mounted in hardened steel cone bearings on a metal fork. The pulley should be constructed from materials having hardness and durability equivalent to phenolic-type materials.
7. Materials
7.1 Scissors or Cutter, suitable for cutting waxed specimen to the desired dimensions.
7.2 Adhesive Tapes, single-faced and double-faced, 13 to 20 mm (1/2 to 3/4 in.) in width.
8. Sampling and Test Specimens
8.1 Test specimens may be flexible, such as wax-coated paper, or rigid, such as wax-coated paperboard or corrugated (Note 1). From each test unit obtained in accordance with Practice D585:
8.1.1 For wax-coated paper, cut test specimens of two sizes: 250 by 130 mm (10 by 5 in.) and 120 by 25 mm (5 by 1 in.).
8.1.2 For wax-coated paperboard or corrugated board, cut test specimens of two sizes: 250 by 130 mm (10 by 5 in.) and 75 by 25 mm (3 by 1 in.).
NOTE 1 - For evaluation of wax, it is necessary to prepare test specimens. Test Method D1465 describes the apparatus used for applying wax to paper, and a method for testing to determine that the correct wax or wax blend has been applied.
8.2 The smaller specimen shall be mounted on the sled assembly. If, during the test, this mounted specimen presents a sharp leading edge, it may dig or plow into the surface of the second specimen. To avoid this, bevel the leading edge (25-mm direction) of the specimen to match the bevel on the glass slide (see Fig. 1).
8.3 Test three pairs of specimens from each sample of wax and use a fresh pair of surfaces for each test.
9. Conditioning
9.1 Condition the specimens and conduct the test at 23 +/- 2°C (73 +/- 3.5°F) and 50 +/- 5 % relative humidity.
