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ASTM D942 - Oxidation Stability of Lubricating Greases by the Oxygen Pressure Vessel Method

Significance and Use

4.1 This test method measures the net change in pressure resulting from consumption of oxygen by oxidation and gain in pressure due to formation of volatile oxidation by-products. This test method may be used for quality control to indicate batch-to-batch uniformity. It predicts neither 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.

1. Scope

1.1 This test method determines resistance of lubricating greases to oxidation when stored statically in an oxygen atmosphere in a sealed system at an elevated temperature under conditions of test.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.2.1 Exception—Pressure measurement appears in kPa with psi provided for information only.

1.2.2 Exception—In Fig. A1.1, A1.1, and Appendix X1, all dimensions are in millimeters, with inches provided in parentheses for information only.

Extracted, with permission, from ASTM D942-19 - Oxidation Stability of Lubricating Greases by the Oxygen Pressure Vessel Method, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, astm.org