ASTM D566-97e1
(Test Method)Standard Test Method for Dropping Point of Lubricating Grease
Standard Test Method for Dropping Point of Lubricating Grease
SCOPE
1.1 This test method covers the determination of the dropping point of lubricating grease.
1.2 This test method is not recommended for use at bath temperatures above 288°C. For higher temperatures Test Method D2265 should be used.
1.3 This standard does not purport to address all of the safety problems, 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. For specific hazard statements, see 6.4 and 8.1.
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An American National Standard
e1
Designation: D 566 – 97
British Standard 2877
Designation 132/97
Standard Test Method for
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Dropping Point of Lubricating Grease
This standard is issued under the fixed designation D 566; 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 in 1964.
This test method has been adopted for use by government agencies to replace Method 1421 of Federal Test Method Standard No. 791b.
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e NOTE—Paragraph 6.4 and Figure 3 were corrected editorially in October 2001.
1. Scope a thickener in a liquid lubricant.
3.1.1.1 Discussion—The dispersion of the thickner forms a
1.1 This test method covers the determination of the drop-
two-phase system and immobilizes the liquid lubricant by
ping point of lubricating grease.
surface tension and other physical forces. Other ingredients are
1.2 This test method is not recommended for use at bath
commonly included to impart special properties. D 217
temperatures above 288°C. For higher temperatures Test
3.1.2 thickener, n—in lubricating grease, a substance com-
Method D 2265 should be used.
posed of finely-divided particles dispersed in a liquid to form
1.3 This standard does not purport to address all of the
the product’s structure.
safety concerns, if any, associated with its use. It is the
3.1.2.1 Discussion—Thickeners can be fibers (such as vari-
responsibility of the user of this standard to establish appro-
ous metallic soaps) or plates or spheres (such as certain
priate safety and health practices and determine the applica-
non-soaps thickeners), which are insoluble or, at most, only
bility of regulatory limitations prior to use. For specific hazard
very slightly soluble in the liquid lubricant. The general
statements, see Note 2.
requirements are that the solid particles are extremely small,
2. Referenced Documents
uniformly dispersed and capable of forming a relatively stable,
gel-like structure with the liquid lubricant. D 217
2.1 ASTM Standards:
3.2 Definitions of Terms Specific to This Standard:
D 217 Test Methods for Cone Penetration of Lubricating
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3.2.1 dropping point, n—a numerical value assigned to a
Grease
grease composition representing the temperature at which the
D 235 Specification for Mineral Spirits (Petroleum Spirits)
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first drop of material falls from the test cup; that temperature
(Hydrocarbon Dry Cleaning Solvents)
being the average of the thermometer readings of the sample
D 2265 Test Method for Dropping Point of Lubricating
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and bath.
Grease Over Wide Temperature Range
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3.2.1.1 Discussion—In the normal and proper operation of
E 1 Specification for ASTM Thermometers
this test method the temperature of the interior of the grease
3. Terminology
test cup and the temperature of the oil bath are monitored
simultaneously as the bath is heated. When the first drop of
3.1 Definitions:
material falls from the cup, the temperature of the grease test
3.1.1 lubricating grease, n—a semi-fluid to solid product of
cup and the bath temperature are averaged and recorded as the
result of the test.
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This test method is under the jurisdiction of ASTM Committee D-2 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
4. Summary of Test Method
D02.G on Lubricating Grease.
4.1 A sample of lubricating grease contained in a cup
In the IP, this test method is under the jurisdiction of the Standardization
Committee. suspended in a test tube is heated in an oil bath at a prescribed
Current edition approved Nov. 10, 1997. Published January 1998. Originally
rate. The temperature at which material falls from the hole in
published as D 566 – 40 T. Last previous edition D 566 – 93.
the bottom of the cup is averaged with the temperature of the
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Annual Book of ASTM Standards, Vol 05.01.
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oil bath and recorded as the dropping point of the grease.
Annual Book of ASTM Standards, Vol 06.04.
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Annual Book of ASTM Standards, Vol 14.03.
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D 566
5. Significance and Use
5.1 In general, the dropping point is the temperature at
which the grease passes from a semisolid to a liquid state under
the conditions of test. This change in state is typical of greases
containing as thickeners soaps of conventional types. Greases
containing as thickeners materials other than conventional
soaps can, without change in state, separate oil. This test
method is useful to assist in identifying the grease as to type
and fo
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