ASTM D2782-01

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 2782 – 01
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 D 2782; 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.
This test method was adopted as a joint ASTM-IP Standard.
This test method has been approved by the sponsoring committees and accepted by the cooperating societies in accordance with
established procedures.
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1. Scope G 40 Terminology Relating to Wear and Erosion
2.2 ASTM Adjuncts: ASTM
1.1 This test method covers the determination of the load-
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Three Glossy Prints of Test Blocks Showing Scars (D 2782)
carrying capacity of lubricating fluids by means of the Timken
Extreme Pressure Tester.
3. Terminology
NOTE 1—This test method is suitable for testing fluids having a
3.1 Definitions:
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viscosity of less than about 5000 cSt (5000 mm /s) at 40°C. For testing
3.1.1 extreme pressure (EP) additive, n, in a lubricant—a
fluids having a higher viscosity, refer to Note 4 in 9.1.
substance that minimizes damage to metal surfaces in contact
1.2 The values stated in SI units are to be regarded as
under high-stress rubbing conditions. D 4175
standard. Because the equipment used in this test method is
3.1.2 lubricant, n—any substance interposed between two
available only in inch-pound units, SI units are omitted when
surfaces for the purpose of reducing friction or wear between
referring to the equipment and the test specimens.
them. G40
1.3 This standard does not purport to address all of the
3.1.3 scoring, n, in tribology—a severe form of wear
safety concerns, if any, associated with its use. It is the
characterized by the formation of extensive grooves and
responsibility of the user of this standard to establish appro-
scratches in the direction of sliding. G40
priate safety and health practices and determine the applica-
3.1.4 wear, n—damage to a solid surface generally involv-
bility of regulatory limitations prior to use. Specific precau-
ing progressive loss of material, due to relative motion between
tionary statements are given in 7.1, 7.2, 8.1, 8.2, 9.4, and 10.1.
that surface and a contacting substance or substances. G40
3.2 Definitions of Terms Specific to This Standard:
2. Referenced Documents
3.2.1 load-carrying capacity of a lubricant— as determined
2.1 ASTM Standards:
by this test method, the maximum load or pressure that can be
D 235 Specification for Mineral Spirits (Petroleum Spirits)
sustained by the lubricant (when used in the given system
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(Hydrocarbon Drycleaning Solvents)
under specific conditions) without failure of the sliding contact
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D 329 Specification for Acetone
surfaces as evidenced by scoring or seizure or asperity weld-
D 2509 Test Method for Measurement of Extreme Pressure
ing.
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Properties of Lubricating Grease (Timken Method)
3.2.2 OK value, n—as determined by this test method, the
D 4175 Terminology Relating to Petroleum, Petroleum
maximum mass (weight) added to the load lever weight pan, at
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Products, and Lubricants
which no scoring or seizure occurs.
3.2.3 score value, n—as determined by this test method, the
minimum mass (weight) added to the load lever weight pan, at
which scoring or seizure occurs.
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This test method is under the jurisdiction of ASTM Committee D02 on
3.2.3.1 Discussion—When the lubricant film is substantially
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.L on Industrial Lubricants. maintained, a smooth scar is obtained on the test block, but
Current edition approved Sept. 10, 2001. Published September 2001. Originally
when there is a breakdown of the lubricant film, scoring or
published as D 2782 – 69 T. Last previous edition D 2782 – 94 (1996).
This test method was prepared under the joint sponsorship of the American
Society of Lubrication Engineers. Accepted by STLE January 1969.
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Annual Book of ASTM Standards, Vol 06.04.
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Annual Book of ASTM Standards, Vol 05.01. Annual Book of ASTM Standards, Vol 03.02
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Annual Book of ASTM Standards, Vol 05.02. Available from ASTM Headquarters, 100 Barr Harbor Drive, West Consho-
hocken, PA 19428. Order ADJD2509.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D2782–01
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surface failure of the test block takes place,
...