ASTM D1831-00e1
(Test Method)Standard Test Method for Roll Stability of Lubricating Grease
Standard Test Method for Roll Stability of Lubricating Grease
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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An American National Standard
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Designation:D1831–00
Standard Test Method for
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Roll Stability of Lubricating Grease
This standard is issued under the fixed designation D 1831; 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 standard has been approved for use by agencies of the Department of Defense.
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e NOTE—Paragraph 6.1 was corrected editorially in November 2001.
1. Scope 3.1.2 lubricant, n—any material interposed between two
surfaces that reduces the friction or wear between them.
1.1 This test method covers determination of the changes in
D 4175
the consistency, as measured by cone penetration, of lubricat-
3.1.3 thickener, n—in lubricating grease, a substance com-
ing greases when worked in the roll stability test apparatus.
posed of finely divided particles dispersed in a liquid lubricant
1.2 The values stated in inch-pound units for the apparatus
to form the product’s structure.
dimensions are to be regarded as standard; the SI conversions
3.1.3.1 Discussion—The thickener can be fibers (such as
are provided for information only.All other values stated in SI
various metallic soaps) or plates or spheres (such as certain
units are standard.
non-soap thickeners) which are insoluble or, at the most, only
1.3 This standard does not purport to address all of the
very slightly soluble in the liquid lubricant. The general
safety concerns, if any, associated with its use. It is the
requirements are that the solid particles be extremely small,
responsibility of the user of this standard to establish appro-
uniformlydispersed,andcapableofformingarelativelystable,
priate safety and health practices and determine the applica-
gel-like structure with the liquid lubricant. D 217
bility of regulatory limitations prior to use.
3.1.4 consistency, n—of lubricating grease, the degree of
2. Referenced Documents
resistance to movement under stress.
3.1.4.1 Discussion—The term consistency is used some-
2.1 ASTM Standards:
what synonymously with penetration. Generally, consistency
D 217 Test Methods for Cone Penetration of Lubricating
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refers to the worked penetration of a grease. D 217
Grease
3.1.5 penetration, n—of lubricating grease, the depth that
D 1403 Test Method for Cone Penetration of Lubricating
the standard cone, when released to fall under its own weight
Grease Using One-Quarter and One-Half Scale Cone
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for 5 s, enters the sample. D 217
Equipment
3.1.6 working, n—of lubricating grease, the subjection of a
D 4175 Terminology Relating to Petroleum, Petroleum
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sample to the shearing action of the standard grease worker.
Products, and Lubricants
D 217
3. Terminology
3.1.7 worked penetration, n—of lubricating grease, the
penetration at 25°C (77°F), without delay, of a sample after 60
3.1 Definitions:
double strokes in a standard grease worker. D 217
3.1.1 lubricating grease, n—a semi-fluid to solid product of
3.2 Definitions of Terms Specific to This Standard:
a dispersion of a thickener in a liquid lubricant.
3.2.1 roll stability, n—of lubricating grease, the change in
3.1.1.1 Discussion—Thedispersionofthethickenerformsa
consistency of a sample after a specified amount of working in
two-phase system and immobilizes the liquid lubricant by
a test apparatus utilizing a weighted roller inside a rotating
surface tension and other physical forces. Other ingredients
cylinder.
imparting special properties are often included. D 217
4. Summary of Test Method
1 4.1 The Test Method D 1403 cone penetration of an ap-
This test method is under the jurisdiction of ASTM Committee D-2 on
proximately 50-g aliquot of lubricating grease is determined.
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.G on Lubricating Grease.
The grease is then subjected to low shear at 20 to 35°C (68 to
Current edition approved Dec. 10, 2000. Published January 2001. Originally
95°F) for 2 h 6 5 min in a standard roll stability apparatus,
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published as D 1831 – 61T. Last previous edition D 1831 – 94 .
2 before the cone penetration is again measured. The difference
Annual Book of ASTM Standards, Vol 05.01.
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Annual Book of ASTM Standards, Vol 05.02. between the cone penetration before working and the cone
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D1831
penetration after is used as a measure of the effect of low shear
P = initial full-scale penetration reading.
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working on grease consistency.
NOTE 1—Penetration readings are measured in tenths of a millimetre.A
negative pen
...
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