ASTM D1831-00(2006)
(Test Method)Standard Test Method for Roll Stability of Lubricating Grease
Standard Test Method for Roll Stability of Lubricating Grease
SIGNIFICANCE AND USE
The roll stability test is widely used in specifications. Test results are significant insofar as they can show a directional change in consistency that could occur in service. No accurate correlation is established between the test results and shear stability in actual service.
SCOPE
1.1 This test method covers determination of the changes in the consistency, as measured by cone penetration, of lubricating greases when worked in the roll stability test apparatus.
1.2 The values stated in inch-pound units for the apparatus dimensions are to be regarded as standard; the SI conversions are provided for information only. All other values stated in SI units are 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:D1831–00 (Reapproved 2006)
Standard Test Method for
Roll Stability of Lubricating Grease
This standard is issued under the fixed designation D1831; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope imparting special properties are often included. D217
3.1.2 lubricant, n—any material interposed between two
1.1 This test method covers determination of the changes in
surfaces that reduces the friction or wear between them.
the consistency, as measured by cone penetration, of lubricat-
D4175
ing greases when worked in the roll stability test apparatus.
3.1.3 thickener, n—in lubricating grease, a substance com-
1.2 The values stated in inch-pound units for the apparatus
posed of finely divided particles dispersed in a liquid lubricant
dimensions are to be regarded as standard; the SI conversions
to form the product’s structure.
are provided for information only.All other values stated in SI
3.1.3.1 Discussion—The thickener can be fibers (such as
units are standard.
various metallic soaps) or plates or spheres (such as certain
1.3 This standard does not purport to address all of the
non-soap thickeners) which are insoluble or, at the most, only
safety concerns, if any, associated with its use. It is the
very slightly soluble in the liquid lubricant. The general
responsibility of the user of this standard to establish appro-
requirements are that the solid particles be extremely small,
priate safety and health practices and determine the applica-
uniformlydispersed,andcapableofformingarelativelystable,
bility of regulatory limitations prior to use.
gel-like structure with the liquid lubricant. D217
2. Referenced Documents
3.1.4 consistency, n—of lubricating grease, the degree of
resistance to movement under stress.
2.1 ASTM Standards:
3.1.4.1 Discussion—The term consistency is used some-
D217 Test Methods for Cone Penetration of Lubricating
what synonymously with penetration. Generally, consistency
Grease
refers to the worked penetration of a grease. D217
D1403 Test Methods for Cone Penetration of Lubricating
3.1.5 penetration, n—of lubricating grease, the depth that
Grease Using One-Quarter and One-Half Scale Cone
the standard cone, when released to fall under its own weight
Equipment
for 5 s, enters the sample. D217
D4175 Terminology Relating to Petroleum, Petroleum
3.1.6 working, n—of lubricating grease, the subjection of a
Products, and Lubricants
sample to the shearing action of the standard grease worker.
3. Terminology
D217
3.1.7 worked penetration, n—of lubricating grease, the
3.1 Definitions:
penetration at 25°C (77°F), without delay, of a sample after 60
3.1.1 lubricating grease, n—a semi-fluid to solid product of
double strokes in a standard grease worker. D217
a dispersion of a thickener in a liquid lubricant.
3.2 Definitions of Terms Specific to This Standard:
3.1.1.1 Discussion—Thedispersionofthethickenerformsa
3.2.1 roll stability, n—of lubricating grease, the change in
two-phase system and immobilizes the liquid lubricant by
consistency of a sample after a specified amount of working in
surface tension and other physical forces. Other ingredients
a test apparatus utilizing a weighted roller inside a rotating
cylinder.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
4. Summary of Test Method
D02.G0 on Lubricating Grease.
4.1 The Test Methods D1403 cone penetration of an ap-
Current edition approved May 1, 2006. Published June 2006. Originally
´1
approved in 1961. Last previous edition approved in 2000 as D1831 – 00 . DOI:
proximately 50-g aliquot of lubricating grease is determined.
10.1520/D1831-00R06.
The grease is then subjected to low shear at 20 to 35°C (68 to
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
95°F) for 2 h 6 5 min in a standard roll stability apparatus,
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 before the cone penetration is again measured. The difference
the ASTM website.
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D1831–00 (2006)
NOTE 1—Penetration readings are measured in tenths of a millimetre.A
between the cone penetration before working and the cone
negative penetration change indicates hardening of a grease while a
penetration after is used as a measure of the effect of low shear
positive penetration change indicates softening.
working on grease consistency.
9. Report
5. Significance and Use
9.1 The value calculated in 8.1 is reported as the change in
5.1 The roll stability test is widely used in specifications.
consistency.
Test results are significant insofar as they can show a direc-
tional change in consistency that could occur in service. No
10. Precision and Bia
...
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