ASTM D2782 Test Method for Measurement of Extreme-Pressure Properties of Lubricating Fluids (Timken Method)
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 +/- 0.77 m/min (405.88 +/- 2.54 ft/min) which is equivalent to a spindle speed of 800 +/- 5 rpm. Fluid samples are preheated to 37.8 +/- 2.8°C (100 +/- 5°F) before starting the test.
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 scoring or seizure; and the maximum load (OK value) at which the rotating cup will not rupture the lubricant film and cause scoring or seizure between the rotating cup and the stationary block.
5. Significance and Use
5.1 This test method is used widely for the determination of extreme pressure properties for specification purposes. Users are cautioned to carefully consider the precision and bias statements herein when establishing specification limits.
