ASTM D5707 Standard Test Method for Measuring Friction and Wear Properties of Lubricating Grease Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
6. Apparatus
6.1 SRV Test Machine, illustrated in Figs. 1-4.
6.2 Microscope, equipped with a filar eyepiece graduated in 0.005 mm division or equipped with a micrometer stage readable to 0.005 mm. Magnification should be sufficient to allow for ease of measurement. One to 10x magnification has been found acceptable.
7. Reagents and Materials
7.1 Test Balls, 52100 steel, Rockwell hardness number of 60 +/- 2 on Rockwell C scale (HRC), 0.025 µm +/- 0.005 µm Ra surface finish, 10 mm diameter.
7.2 Lower Test Disk, vacuum arc remelted (VAR) AISI 52100 steel with an inclusion rating using Method D, Type A, as severity level number of 0.5 according to Test Methods E45 and Specification A295/A295M or an inclusion sum value K1≤10 according to DIN EN ISO 683-17 and spherodized annealed to obtain globular carbide, Rockwell hardness number of 60 +/- 2 on Rockwell C scale (HRC), the surfaces of the disk being lapped and free of lapping raw materials. The topography of the disk will be determined by four values, 24 mm diameter by 7.85 mm thick:
0.5 µm < Rz (DIN) < 0.650 µm
0.035 µm < Ra (C.L.A.) < 0.050 µm
0.020 µm < Rpk < 0.035 µm
0.050 µm < Rvk < 0.075 µm
NOTE 3 - The DIN 17230-1980 was replaced by DIN EN ISO 683-17.
7.3 n-Heptane, reagent grade. (Warning - Flammable. Health hazard.)
7.4 Isopropanol, reagent grade. (Warning - Flammable. Health hazard.)
7.5 Toluene, reagent grade. (Warning - Flammable. Health hazard.)
7.6 Cleaning Solvent, the test disks have to be cleaned by a liquid solvent (non-chlorinated, non-film forming).
NOTE 4 - It is recommended to use a mixture of equal volumes of n-heptane, isopropanol, and toluene, all as reagent grades. (Warning - Flammable. Health hazard.)
