ASTM D2782-02e1

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An American National Standard
e1
Designation:D2782–02
240/84
Standard Test Method for
Measurement of Extreme-Pressure Properties of Lubricating
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Fluids (Timken Method)
This standard is issued under the fixed designation D2782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Adjunct references were corrected editorially in April 2006.
1. Scope* 2.2 ASTM Adjuncts:
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Photograph of Test Blocks Showing Scars
1.1 This test method covers the determination of the load-
carrying capacity of lubricating fluids by means of theTimken
3. Terminology
Extreme Pressure Tester.
3.1 Definitions:
NOTE 1—This test method is suitable for testing fluids having a
3.1.1 extreme pressure (EP) additive, n, in a lubricant—a
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viscosity of less than about 5000 cSt (5000 mm /s) at 40°C. For testing
substance that minimizes damage to metal surfaces in contact
fluids having a higher viscosity, refer to Note 5 in 9.1.
under high-stress rubbing conditions. D4175
1.2 The values stated in SI units are to be regarded as
3.1.2 lubricant, n—any substance interposed between two
standard. Because the equipment used in this test method is
surfaces for the purpose of reducing friction or wear between
available only in inch-pound units, SI units are omitted when
them. G40
referring to the equipment and the test specimens.
3.1.3 scoring, n, in tribology—a severe form of wear
1.3 This standard does not purport to address all of the
characterized by the formation of extensive grooves and
safety concerns, if any, associated with its use. It is the
scratches in the direction of sliding. G40
responsibility of the user of this standard to establish appro-
3.1.4 wear, n—damage to a solid surface generally involv-
priate safety and health practices and determine the applica-
ingprogressivelossofmaterial,duetorelativemotionbetween
bility of regulatory limitations prior to use. Specific precau-
that surface and a contacting substance or substances. G40
tionary statements are given in 7.1, 7.2, 8.1, 8.2, 9.4, and 9.9.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 load-carrying capacity of a lubricant—as determined
2. Referenced Documents
by this test method, the maximum load or pressure that can be
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2.1 ASTM Standards:
sustained by the lubricant (when used in the given system
D2509 Test Method for Measurement of Load-Carrying
underspecificconditions)withoutfailureoftheslidingcontact
Capacity of Lubricating Grease (Timken Method)
surfaces as evidenced by scoring or seizure or asperity weld-
D4175 Terminology Relating to Petroleum, Petroleum
ing.
Products, and Lubricants
3.2.2 OK value, n—as determined by this test method, the
G40 Terminology Relating to Wear and Erosion
maximummass(weight)addedtotheloadleverweightpan,at
which no scoring or seizure occurs.
3.2.3 score value, n—asdeterminedbythistestmethod,the
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This test method is under the jurisdiction of ASTM Committee D02 on
minimum mass (weight) added to the load lever weight pan, at
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
which scoring or seizure occurs.
D02.L0 on Industrial Lubricants.
Current edition approved Nov. 10, 2002. Published January 2003. Originally
3.2.3.1 Discussion—Whenthelubricantfilmissubstantially
approved in 1969. Last previous edition approved in 2001 as D2782–01.
maintained, a smooth scar is obtained on the test block, but
This test method was adopted as a joint ASTM-IP Standard.
when there is a breakdown of the lubricant film, scoring or
This test method was prepared under the joint sponsorship of the American
Society of Lubrication Engineers. Accepted by STLE January 1969. surface failure of the test block takes place, as shown in Figs.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD2509. Original adjunct produced in 1972.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2782–02
FIG. 1 Test Blocks Showing Various Types of Scar
are cautioned to carefully consider the precision and bias
statements herein when establishing specification limits.
6. Apparatus
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6.1 Timken Extreme Pressure Tester, described in detail in
Annex A1 and illustrated in Fig. 3.
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6.2 Sample Fee
...