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Cite this document
The laboratory evaluation of 62 commercially available rust and oxidation inhibited (R&O) oils in viscosity classifications of 150, 300, and 1000 sec Saybolt Universal (SSU) at 100 F is described. The tests used included the ASTM turbine oil stability test (D 943), Alcoa oxygen absorption test, ASTM demulsibility test (D 1401), and ASTM rust test (D 665). A satisfactory degree of correlation was found between the ASTM D 943 and Alcoa oxygen absorption tests. Data from the D 943 tests strongly indicate that (1) a neutralization value of 2.0 is very unrealistic as an acceptable end point of the test, and (2) odor and visual observations could be included in the test procedure as long as the required descriptions are not too exacting.
A surprisingly large number of the products failed to pass the D 665 rust test when conducted on samples taken from the original shipping containers. Many of the oils which passed the D 665 rust test when new also continued to pass the same test after many years of service.
The oxidation stability of these R&O products varied widely. Interestingly, the average oxidation stability of currently marketed R&O oils is greatly superior to that of products sold under the same brand names nine years ago.
Milz, W C
Assistant Chief, Lubricants Division, Alcoa Research Laboratories, New Kensington, Pa.
Bunting, J T
Staff Mechanical Engineer, Aluminum Co. of America, Pittsburgh, Pa.