ASTM D3704 Test Method for Wear Preventive Properties of Lubricating Greases
ASTM D3704 Standard Test Method for Wear Preventive Properties of Lubricating Greases Using the (Falex) Block on Ring Test Machine in Oscillating Motion
6. Apparatus
6.1 Falex Block-on-Ring Test Machine with Friction Recorder, described in detail in Annex A1 and illustrated in Fig. 1.
6.2 Falex Oscillating Drive Accessory, described in detail in A1.6 and illustrated in Fig. 2.
6.3 Microscope, low-power (50x to 60x) having sufficient clearance under objective to accommodate the test block. It should be fitted with a filar micrometer so that scar width may be measured with accuracy of +/-0.01 mm.
6.4 Timer, graduated in minutes and seconds.
7. Reagents and Materials
7.1 Test Rings, Falex Type S-10 or S-25 - SAE 4620 carburize steel, having a hardness of 58 to 63 HRC. The test ring has a width of 8.15 mm (0.321 in.), a diameter of 35 mm (1.3775 in.) and a maximum radial run out of 0.013 mm (0.0005 in.). The surface roughness of the S-10 ring shall be 0.15–0.30 µm (6 to 12 µin.) rms. The surface roughness of the S-25 ring shall be 0.51 to 0.71 µm (22 to 28 µin.) rms.
7.2 Test Blocks, Falex Type H-30 or H-60 - SAE 01 tool steel having two ground test surfaces of 0.10–0.20 µm (4 to 8 µin.) rms. The test block has a width 6.35 mm (0.250 in.) and a 15.76 mm (0.620 in.) length. The H-30 test block has a hardness of HRC 27 to 33. The H-60 test block has a hardness of HRC 58 to 63.
7.3 Solvent, non-film forming, nonchlorinated.
NOTE 1 - Solvents formerly used in this test method were eliminated due to possible toxic effects. Each user should select a solvent that can meet his applicable safety standards and still thoroughly clean the machine parts.
