ASTM D943

This test method is widely used for specification purposes and is considered of value in estimating the oxidation stability of lubricants, especially those that are prone to water contamination. It should be recognized, however, that correlation between results of this method and the oxidation stability of a lubricant in field service may vary markedly with field service conditions and with various lubricants. The precision statement for this method was determined on steam turbine oils.

Note 1—Furthermore, in the course of testing a lubricant by this method, other signs of deterioration, such as sludge formation or catalyst coil corrosion, may appear that are not reflected in the calculated oxidation lifetime. The subcommittee responsible for this method is investigating the application of alternative criteria for evaluation of lubricants using this test apparatus. Test Method D 4310 is now available for sludge measurement.

1. Scope

1.1 This test method covers the evaluation of oxidation stability of inhibited steam-turbine oils in the presence of oxygen, water, and copper and iron metals at an elevated temperature. The test method is also used for testing other oils such as hydraulic oils and circulating oils having a specific gravity less than that of water and containing rust and oxidation inhibitors.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 6.

2. Referenced Documents

A510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel
B1 Specification for Hard-Drawn Copper Wire
D1193 Specification for Reagent Water
D3244 Practice for Utilization of Test Data to Determine Conformance with Specifications
D3339 Test Method for Acid Number of Petroleum Products by Semi-Micro Color Indicator Titration
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4310 Test Method for Determination of the Sludging and Corrosion Tendencies of Inhibited Mineral Oils
D5770 Test Method for Semi-Quantitative Micro Determination of Acid Number of Lubricating Oils During Oxidation Testing
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
E1 Specification for ASTM Liquid-in-Glass Thermometers
BS1829
Specifications for IP Standard Thermometers

Index Terms

acid number; circulating oils; corrosion; hydraulic oils; inhibited steam-turbine oils; iron-coffer catalyst; metal catalyst; oxidation; oxidation lifetime; oxidation stability; test life; turbine oils; ICS Number Code 75.080

Citing ASTM Standards

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