ASTM D2893-99
(Test Method)Standard Test Method for Oxidation Characteristics of Extreme-Pressure Lubrication Oils
Standard Test Method for Oxidation Characteristics of Extreme-Pressure Lubrication Oils
SCOPE
1.1 This test method covers determination of the oxidation characteristics of extreme-pressure fluid lubricants, gear oils, or mineral oils. Note 1-The changes in the lubricant resulting from this test method are not always necessarily associated with oxidation of the lubricant. Some changes may be due to thermal degradation.
1.2 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.
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 2893 – 99
Standard Test Method for
Oxidation Characteristics of Extreme-Pressure Lubrication
Oils
This standard is issued under the fixed designation D 2893; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
NOTE 2—It is recognized that many of the newer extreme pressure oils
1. Scope
cannot reasonably be evaluated by this test method. The test has also been
1.1 This test method covers determination of the oxidation
run at 121°C, however, the precision has not been established at other than
characteristics of extreme-pressure fluid lubricants, gear oils,
95°C.
or mineral oils.
5. Apparatus
NOTE 1—The changes in the lubricant resulting from this test method
5.1 Heating Bath, thermostatically controlled, capable of
are not always necessarily associated with oxidation of the lubricant.
Some changes may be due to thermal degradation. maintaining the oil sample in the test tube at a temperature of
95 6 0.2°C, fitted with a suitable stirring device to provide a
1.2 This standard does not purport to address all of the
uniform temperature throughout the bath, and large enough to
safety concerns, if any, associated with its use. It is the
hold the desired number of oxidation cells immersed in the
responsibility of the user of this standard to establish appro-
heating liquid to a depth of approximately 300 mm.
priate safety and health practices and determine the applica-
5.2 Test Tubes of borosilicate glass, 41 6 0.5 mm inside
bility of regulatory limitations prior to use.
diameter and 600 mm in length are required, each fitted with a
2. Referenced Documents slotted cork (Note 3) stopper into which shall be inserted a
glass air delivery tube of 4 to 5 mm of inside diameter. The
2.1 ASTM Standards:
length of the air delivery tube shall be such that one end
D 91 Test Method for Precipitation Number of Lubricating
reaches to within 6 mm of the bottom of the tube and the other
Oils
end projects 60 to 80 mm from the cork stopper.
D 445 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids (and the Calculation of Dynamic
NOTE 3—New corks should be used for each run.
Viscosity)
5.3 Flowmeter, one to each test tube, capable of measuring
E 1 Specification for ASTM Thermometers
an air flow of 10 L/h with an accuracy of 60.5 L/h.
5.4 Thermometer—ASTM Solvent Distillation Thermom-
3. Summary of Test Method
eter having a range from 76 to 126°C and conforming to the
3.1 The oil sample is subjected to a temperature of 95°C in
requirement for Thermometer 40C as prescribed in Specifica-
the presence of dry air for 312 h.
tion E 1.
3.2 The oil is then tested for precipitation number and
5.5 Air Supply—Oil-free, dried air at constant pressure shall
increase in kinematic viscosity.
be supplied to each flowmeter.
5.6 Air Dryer—Before being supplied to the flowmeters, the
4. Significance and Use
air shall be passed through a drying tower packed with
4.1 This test method has been widely used to measure the
indicating grade of anhydrous calcium sulfate or equivalent.
oxidation stability of extreme pressure lubricating fluids, gear
The quantity of dessicant should be sufficient to last for the
oils, and mineral oils.
entire test.
6. Preparation of Apparatus
This test method is under the jurisdiction of ASTM Committee D-2 on
6.1 Cleaning of Oxidation Cells—Clean glassware with a
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
suitable cleaning solution.
D02.09on Oxidation.
Current edition approved June 10, 1999. Published August 1999. Originally
NOTE 4—While other suitable cleaning solutions are now available, the
published as D 2893 – 70 T. Last previous edition D 2893 – 95.
round robin used glassware cleaned with chromic acid. (Warning—
Annual Book of ASTM Standards, Vol 05.01.
Annual Book of ASTM Standards, Vol 14.03. Causes severe burns. A recognized carcinogen. Strong oxidizer, contact
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D2893–99
with other material may cause fire. Hygroscropic.) Other cleaning
10.2 Viscosity Increase:
solutions such as NoChromix and Micro Clean have been found suitable.
10.2.1 Repeatability—Duplicate results by the same opera-
In a referee situation, glassware shall be cleaned by a cleaning solution
tor shall be considered suspect if they differ by more than the
sat
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