EXTREME PRESSURE PROPERTIES OF LUBRICATING FLUIDS: ASTM D2782
(Equivalent Test Methods: IP 240 and DIN 51434)
EXPLANATION
This test method is widely used for the determination of extreme pressure properties for specification purposes of the load carrying capacity of lubricating fluids by means of Timken Extreme Pressure Tester. This test method is suitable for testing fluids having a viscosity of less than 5000 cSt at 40° C.
TEST SUMMARY
The test is operated with a steel test cup rotating against a steel test block at a rotating speed of 123.71 +/- 0.77 m/min, which is equivalent to a spindle speed of 800 +/- 5 r/min. Fluid samples are preheated to 37.8 +/- 2.8° C before starting the test. Two determinations are made:
(a) 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
(b) The maximum load (OK value) at which the rotating cup will not rupture the lubricant film or cause scoring or seizure between the rotating cup and the stationary block.
TEST PRECISION
This test method has a repeatability of 30 and a reproducibility of 74 % of the mean value.
