(Equivalent Test Methods: IP 142 and DIN 51808)
EXPLANATION
This test method measures the net change in pressure resulting from oxygen consumption by oxidation and gain in pressure due to the formation of volatile oxidation by-products. This test method does not predict the stability of greases under dynamic service conditions, nor the stability of greases stored in containers for long periods, nor the stability of films of greases on bearings and motor parts. It should not be used to estimate the relative oxidation resistance of different grease types.
TEST SUMMARY
The sample of grease is oxidized in a bomb heated to 99° C and filled with oxygen at 110 psi. Pressure is observed and recorded at stated intervals. The degree of oxidation after a given period of time is determined by the corresponding decrease in oxygen pressure.
TEST PRECISION
This procedure has no bias.