ASTM D2509 test method for load-carrying capacity of lubricating grease
4. Summary of Test Method
4.1 The tester is operated with a steel test cup rotating against a steel test block. The rotating speed is 123.71 more or less 0.77 m/min (405.88 more or less 2.54 ft/min) which is equivalent to a spindle speed of 800 more or less 5 rpm. Grease samples are brought to and applied at 24 more or less 6°C (75 more or less 10°F).
4.2 Two determinations are made: the minimum load (score value) that will rupture the lubricant film being tested between the rotating cup and the stationary block and cause abrasion; and the maximum load (OK value) at which the rotating cup will not rupture the lubricant film and cause abrasion between the rotating cup and the stationary block.
5. Significance and Use
5.1 The test method is used widely for specification purposes and is used to differentiate between greases having low, medium, or high levels of extreme pressure characteristics. The results may not correlate with results from service.
