ASTM D5483-02e1
(Test Method)Standard Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
Standard Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
SCOPE
1.1 This test method covers the determination of oxidation induction time of lubricating greases subjected to oxygen at 3.5 MPa (500 psig) and temperatures between 155 and 210°C.
1.2 The values stated in SI units are to be regarded as the standard.
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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
e1
Designation:D5483–02
Standard Test Method for
Oxidation Induction Time of Lubricating Greases by
1
Pressure Differential Scanning Calorimetry
This standard is issued under the fixed designation D 5483; 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.
1
e NOTE—Editorial changes were made throughout in September 2005.
1. Scope 4. Summary of Test Method
1.1 This test method covers the determination of oxidation 4.1 Asmall quantity of grease is weighed into a sample pan
induction time of lubricating greases subjected to oxygen at and placed in a test cell. The cell is heated to a specified
3.5 MPa (500 psig) and temperatures between 155 and 210°C. temperature and then pressurized with oxygen. The cell is held
1.2 The values stated in SI units are to be regarded as the at a regulated temperature and pressure until an exothermic
standard. reaction occurs. The extrapolated onset time is measured and
1.3 This standard does not purport to address all of the reported as the oxidation induction time for the grease under
safety concerns, if any, associated with its use. It is the the specified test temperature.
responsibility of the user of this standard to establish appro- 4.2 A kinetic equation incorporated with this test method
priate safety and health practices and determine the applica- can estimate oxidation induction times at other temperatures.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 Oxidation induction time, as determined under the
2.1 ASTM Standards: conditions of this test method, can be used as an indication of
2 3
E 473 Terminology Relating to Thermal Analysis oxidation stability. This test method can be used for research
and development, quality control and specification purposes.
3. Terminology
However, no correlation has been determined between the
3.1 Definitions of Terms Specific to This Standard:
results of this test method and service performance.
3.1.1 extrapolated onset time, n—a time determined on a
6. Apparatus
thermal curve, as the intersection of the extrapolated baseline
and a line tangent to the oxidation exotherm constructed at its 6.1 Pressure Differential Scanning Calorimeter (PDSC),
4
maximum rate. equipped with the following items (See Fig. 1).
3.1.2 oxidation induction time (OIT), n— the period of time 6.1.1 Sample Enclosure, with capability to 3.5 MPa (500
from the first exposure to an oxidizing atmosphere until the psig) at 210°C and pressure gage graduated at intervals of 200
extrapolated onset time. kPa (28.6 psi) or less.
3.1.3 pressure differential scanning calorimeter, (PDSC), 6.2 Thermal Analyzer.
n—a differential scanning calorimeter, as defined in Terminol- 6.3 Aluminum Sample Solid Fat Index (SFI), pan (see Note
ogy E 473, that is capable of maintaining the test sample at a 1).
controlled, elevated pressure. 6.4 Oxidation Stability Software.
3.1.4 thermal curve, n—a graph of sample heat flow versus 6.5 Calibration Software.
time. 6.6 Flowmeter, with a capacity of at least 200 mL/min.
1 3
This test method is under the jurisdiction of ASTM Committee D02 on Rhee, In-Sik, “Development of a New Oxidation Stability Test Method for
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee Greases Using a Pressure Differential Scanning Calorimeter (PDSC),” NLGI
D02.09 on Oxidation. Spokesman, Vol 55, No. 4, July 1991, pp. 123–132.
4
Current edition approved Jan. 10, 2002. Published March 2002. Originally Available from TA Instruments, Inc., 109 Lukens Drive, New Castle, DE
published as D 5483–93. Last previous edition D 5483–95. 19720.At the time that the round robin data for this test method was generated, only
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or this company manufactured equipment that met the requirements of 5.1. Subse-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM quently, other companies have manufactured equipment meeting these require-
Standards volume information, refer to the standard’s Document Summary page on ments. Their use is permitted provided their performance is consistent with the
the ASTM website. repeatability and reproducibility described in Section 10.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
e1
D5483–02
pressure, but has been found to be elevated to 157.4°C under the
5
conditions of this test method, 3.5 MPa (500 psig) of oxygen.
8.2 Temperature C
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.