ASTM D7342-15
(Test Method)Standard Test Method for Prolonged Worked Stability of Lubricating Grease in Presence of Water (Water Stability Test)
Standard Test Method for Prolonged Worked Stability of Lubricating Grease in Presence of Water (Water Stability Test)
SIGNIFICANCE AND USE
5.1 It is known that contamination by water can affect the shear stability of some greases in service. This test method is widely used to determine the wet shear stability of greases in service. Many grease specifications require these procedures as a wet shear stability test. No accurate correlation is established between the test results and wet shear stability of grease in actual service.
SCOPE
1.1 This test method covers a procedure for determining the shear stability of lubricating grease in the presence of water (wet shear stability) by a full scale grease worker. This test method is also known as the water stability test.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
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Designation: D7342 − 15
Standard Test Method for
Prolonged Worked Stability of Lubricating Grease in
1
Presence of Water (Water Stability Test)
This standard is issued under the fixed designation D7342; 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* 3.1.2 lubricating grease, n—semi-fluid to solid product of a
dispersion of a thickener in a liquid lubricant.
1.1 This test method covers a procedure for determining the
3.1.2.1 Discussion—The dispersion of the thickener forms a
shear stability of lubricating grease in the presence of water
two-phase system and immobilizes the liquid lubricant by
(wet shear stability) by a full scale grease worker. This test
surface tension and other physical forces. Other ingredients are
method is also known as the water stability test.
commonly included to impart special properties. D217
1.2 The values stated in SI units are to be regarded as
3.1.3 penetration, n—of lubricating grease, depth that the
standard. No other units of measurement are included in this
standard cone, when released to fall under its own weight for
standard.
5 s, enters the sample. D217
1.3 This standard does not purport to address all of the
3.1.4 thickener, n—in lubricating grease, substance com-
safety concerns, if any, associated with its use. It is the
posed of finely divided particles dispersed in a liquid lubricant
responsibility of the user of this standard to establish appro-
to form the product’s structure.
priate safety and health practices and determine the applica-
3.1.4.1 Discussion—The thickener can be fibers (such as
bility of regulatory limitations prior to use.
various metallic soaps) or plates or spheres (such as certain
non-soap thickener) which are insoluble or, at most, only very
2. Referenced Documents
slightly soluble in liquid lubricant. The general requirements
2
2.1 ASTM Standards:
are that the solid particles to be relatively stable, gel-like
D217 Test Methods for Cone Penetration of Lubricating
structure with the liquid lubricant. D217
Grease
D1193 Specification for Reagent Water 3.1.5 wet shear stability, n—of lubricating grease, change in
consistency of a mixture of sample and small amount of water
D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products after a specified amount of working in a grease worker.
D4175 Terminology Relating to Petroleum Products, Liquid
3.1.6 worked penetration, n—of lubricating grease, the
Fuels, and Lubricants
penetration at 25 °C, without delay, of a sample after 60 double
strokes in a standard grease worker. D217
3. Terminology
3.1.7 working, n—of lubricating grease, subjection of a
3.1 Definitions:
sample to the shearing action of the standard grease worker.
3.1.1 consistency, n—of lubricating grease, degree of resis-
D217
tance to movement under stress.
3.1.1.1 Discussion—The term consistency is used somewhat
4. Summary of Test Method
synonymously with penetration. Generally, consistency refers
4.1 Agrease sample mixed with a small amount of water is
to the worked penetration of a grease. D217
subjected to low shear at 20 °C to 35 °C for a specified time or
strokes in a standard grease worker.The difference between the
cone penetration before working and the cone penetration after
1
This test method is under the jurisdiction of ASTM Committee D02 on
is used as a measure of the wet shear stability of the grease.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.G0.02 on Consistency and Related Rheological Tests.
Current edition approved Dec. 1, 2015. Published February 2016. Originally
5. Significance and Use
approved in 2007. Last previous edition approved in 2007 as D7342 – 07. DOI:
10.1520/D7342-15.
5.1 It is known that contamination by water can affect the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shear stability of some greases in service. This test method is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
widely used to determine the wet shear stability of greases in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. service. Many grease specifications require these procedures as
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
1
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D7342 − 15
NOTE 1—If free water is observed after mixing, then additional mixing
a wet shear stability test. No accurate correlation is establi
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7342 − 07 D7342 − 15
Standard Test Method for
Shear Prolonged Worked Stability of Lubricating Grease in
1
Presence of Water (Water Stability Test)
This standard is issued under the fixed designation D7342; 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 Scope*
1.1 This test method covers two proceduresa procedure for determining the shear stability of lubricating grease in the presence
of water (wet shear stability) by a full scale grease worker or a roll stability test apparatus. Both procedures can be used to
determine the relative wet shear stability of greases, but the results between procedures are not directly comparable. worker. This
test method is also known as the water stability test.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D217 Test Methods for Cone Penetration of Lubricating Grease
D1403D1193 Test Methods for Cone Penetration of Lubricating Grease Using One-Quarter and One-Half Scale Cone
EquipmentSpecification for Reagent Water
D1831D4057 Test Method for Roll Stability of Lubricating GreasePractice for Manual Sampling of Petroleum and Petroleum
Products
D1193D4175 Specification for Reagent WaterTerminology Relating to Petroleum, Petroleum Products, and Lubricants
3. Terminology
3.1 Definitions:
3.1.1 consistency, n—of lubricating grease, degree of resistance to movement under stress.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.G0.07 on Research Techniques.
Current edition approved May 1, 2007Dec. 1, 2015. Published May 2007February 2016. Originally approved in 2007. Last previous edition approved in 2007 as
D7342 – 07. DOI: 10.1520/D7342-07.10.1520/D7342-15.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3.1.1.1 Discussion—
The term consistency is used somewhat synonymously with penetration. Generally, consistency refers to the worked penetration
of a grease. D217
3.1.2 lubricating grease, n—semi-fluid to solid product of a dispersion of a thickener in a liquid lubricant.
3.1.2.1 Discussion—
The dispersion of the thickener forms a two-phase system and immobilizes the liquid lubricant by surface tension and other
physical forces. Other ingredients are commonly included to impart special properties. D217
3.1.3 penetration, n—of lubricating grease, depth that the standard cone, when released to fall under its own weight for 5 s, 5 s,
enters the sample. D217
*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
1
---------------------- Page: 1 ----------------------
D7342 − 15
3.1.4 thickener, n—in lubricating grease, substance composed of finely divided particles dispersed in a liquid lubricant to form
the product’s structure.
3.1.4.1 Discussion—
The thickener can be fibers (such as various metallic soaps) or plates or spheres (such as certain non-soap thickener) which are
insoluble or, at most, only very slightly soluble in liquid lubricant. The general requirements are that the solid particles to be
relatively stable, gel-like structure with the liquid lubricant. D217
3.1.5 wet shear stability, n—of lubricating grease, change in consistency of a mixture of sample and small amount of water after
a specified amount of working in a grease worker or a roll stability test apparatus.worker.
3.1.6 worked penetration, n—of lubricating grease, the penetration at 25°C,25 °C, without delay, of a sample after 60 double
strokes in a standard grease worker. D217
3.1.7 working, n—of lubricating grease, subjection of a sample to the shearing a
...
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