ASTM D5706 Standard Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
6. Apparatus
6.1 SRV Test Machines, illustrated in Figs. 1-4.
7. Reagents and Materials
7.1 Test Ball, 52100 steel, Rockwell hardness number of 60 HRC +/- 2 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 HRC +/- 2 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 2 - 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 3 - It is recommended to use a mixture of equal volumes of n-heptane, isopropanol, and toluene, all as reagent grades. (Warning - Flammable. Health hazard.)
