ASTM D7918-23

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: D7918 − 23
Standard Test Method for
Measurement of Flow Properties and Evaluation of Wear,
Contaminants, and Oxidative Properties of Lubricating
1
Grease by Die Extrusion Method and Preparation
This standard is issued under the fixed designation D7918; 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.
1. Scope* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination and evalua-
D217 Test Methods for Cone Penetration of Lubricating
tion of flow properties, wear levels, contaminants, and oxida-
Grease
tive condition of new and in-service lubricating grease.
D6300 Practice for Determination of Precision and Bias
1.2 This test method provides guidance on evaluating in-
Data for Use in Test Methods for Petroleum Products,
service grease samples, NLGI grades 00 to 3, for wear,
Liquid Fuels, and Lubricants
consistency, contamination, and oxidation.
D6595 Test Method for Determination of Wear Metals and
Contaminants in Used Lubricating Oils or Used Hydraulic
1.3 The values stated in SI units are to be regarded as the
Fluids by Rotating Disc Electrode Atomic Emission Spec-
standard. The values given in parentheses are for information
trometry
only.
D7527 Test Method for Measurement of Antioxidant Con-
1.3.1 Exception—The exception to this will be where units
tent in Lubricating Greases by Linear Sweep Voltammetry
of references were developed by the developers of the test
D7546 Test Method for Determination of Moisture in New
equipment and necessary to report the results of the test.
and In-Service Lubricating Oils and Additives by Relative
1.4 This standard does not purport to address all of the
Humidity Sensor
safety concerns, if any, associated with its use. It is the
D7718 Practice for Obtaining In-Service Samples of Lubri-
responsibility of the user of this standard to establish appro-
cating Grease
priate safety, health, and environmental practices and deter-
D7843 Test Method for Measurement of Lubricant Gener-
mine the applicability of regulatory limitations prior to use.
ated Insoluble Color Bodies in In-Service Turbine Oils
1.5 This international standard was developed in accor-
using Membrane Patch Colorimetry
dance with internationally recognized principles on standard-
E177 Practice for Use of the Terms Precision and Bias in
ization established in the Decision on Principles for the
ASTM Test Methods
Development of International Standards, Guides and Recom-
E691 Practice for Conducting an Interlaboratory Study to
mendations issued by the World Trade Organization Technical
Determine the Precision of a Test Method
Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions:
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.96.07 on Integrated Testers, Instrumentation Techniques for
2
In-Service Lubricants. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2023. Published November 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2015. Last previous edition approved in 2017 as D7918 – 17a. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7918-23. the ASTM website.
*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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D7918 − 23
3.1.1 active grease sampling device, n—device designed to pressed as a percent when compared to the average of three
take an active sample of a lubricating grease from a bearing, unique test conditions of the unused lubricating grease base-
gear, or drive shaft located in a grease lubricated component. line.
D7718
3.2.2 die extrusion tester, n—a device that measures the
3.1.1.1 Discussion—The Grease Thief (trademarked) Type
consistency of in-service lubricating greases and compares the
3
2 is a tool which meets this description and can be used to
measurement to the values obtained from a baseline sample of
obtain an active grease sample from a lubricated component. A
lubricating grease.
full description and dimensions of this device can be found in
3.2.3 ferrous debris level, n—the total amount of ferrous
Annex A2.
me
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