ASTM D2112-15

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2112 − 15
Standard Test Method for
Oxidation Stability of Inhibited Mineral Insulating Oil by
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Pressure Vessel
This standard is issued under the fixed designation D2112; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope copper vessel (for rapid temperature equilibrium), with a glass
test specimen container and copper catalyst coil, in the pres-
1.1 This test method covers and is intended as a rapid
ence of water, at a bath temperature of 140°C. The time for an
method for the evaluation of the oxidation stability of new
oil to react with a given volume of oxygen is measured;
mineral insulating oils containing a synthetic oxidation inhibi-
completion of the test is indicated by a specific drop in
tor. This test is considered of value in checking the oxidation
pressure.
stability of new mineral insulating oils containing 2,6-
ditertiary-butyl para-cresol or 2,6-ditertiary-butyl phenol, or
4. Significance and Use
both, in order to control the continuity of this property from
4.1 This is a control test of oxidation stability of new,
shipment to shipment. The applicability of this procedure for
inhibited mineral insulating oils for determining the induction
use with inhibited mineral insulating oils of more than 12 cSt
period of oxidation inhibitors under prescribed accelerated
at 40°C (approximately 65 SUS at 100°F) has not been
aging conditions. There is no proven correlation between oil
established.
performance in this test and performance in service. However,
1.2 The values stated in SI units are to be regarded as
the test method may be used to check the continuity of
standard except where there is no direct equivalent for hard-
oxidation stability of production oils.
ware designed on the inch-pound unit basis.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Oxidation Vessel—Glass test specimen container with
responsibility of the user of this standard to establish appro-
cover and catalyst coil, pressure gauge, thermometer, test bath,
priate safety and health practices and determine the applica-
and accessories as described in Annex A1. The assembled
bility of regulatory limitations prior to use. (See warning in
apparatus is shown in Fig. 1, and its design shown schemati-
6.7.)
cally in Fig. 2.
2. Referenced Documents
6. Reagents and Materials
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2.1 ASTM Standards:
6.1 Purity of Reagents—Use reagent grade chemicals in all
B1 Specification for Hard-Drawn Copper Wire
tests. Unless otherwise indicated, all reagents shall conform to
E1 Specification for ASTM Liquid-in-Glass Thermometers
the specifications of the Committee on Analytical Reagents of
the American Chemical Society, where such specifications are
3. Summary of Test Method
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available.
3.1 The test specimen is agitated by rotating axially at 100
6.2 Hydrochloric Acid, 10 vol %.
r/min at an angle of 30° from the horizontal, under an initial
oxygen pressure of 620 kPa (90 psi), in a stainless steel or
6.3 Silicon Carbide Abrasive Cloth, 100-grit with cloth
backing.
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This test method is under the jurisdiction of ASTM Committee D27 on
6.4 Acetone, ACS grade.
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
mittee D27.06 on Chemical Test.
Current edition approved Nov. 15, 2015. Published February 2015. Originally
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approved in 1962. Last previous edition approved in 2007 as D2112–01a(2007). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D2112-15. Chemical Society, Washington, DC. For Suggestions on the testing of reagents not
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
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D2112 − 15
determine by difference the water retained in the system.
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