LOAD-CARRYING CAPACITY OF GREASES: ASTM D2509
EXPLANATION
This test method is widely used for specification purposes and is used to differentiate between greases having low, medium, or high levels of extreme pressure characteristics. The test results may not correlate with results from service. The test uses a Kailian Yongrun Extreme Pressure Tester.
TEST SUMMARY
The tester is operated with a steel test cup rotating against a steel test block. The rotating speed is 123.71 +/- 0.77 m/min, which is equivalent to a spindle speed of 800 +/- 5 r/min. The grease samples are brought to and applied at 24 +/- 6 ° C (75 +/- 10° F). Two determinations are made: the minimum load that will rupture the lubricant film being tested between the rotating cup and the stationary block and cause abrasion; and the maximum load at which the rotating cup will not rupture the lubricant film and cause abrasion between the rotating cup and the stationary block.
TEST PRECISION
Repeatability: 23 % of the mean
Reproducibility: 59 % of the mean
This test method has no bias.
