ASTM D892-05
(Test Method)tandard Test Method for Foaming Characteristics of Lubricating Oils
tandard Test Method for Foaming Characteristics of Lubricating Oils
SCOPE
1.1 This test method covers the determination of the foaming characteristics of lubricating oils at 24C and 93.5C. Means of empirically rating the foaming tendency and the stability of the foam are described.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. For specific warning statements, see Sections 7, 8, and 9.1.1.
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An American National Standard
Designation:D892–05 British Standard 5092
Designation: 146/2000
Standard Test Method for
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Foaming Characteristics of Lubricating Oils
This standard is issued under the fixed designation D892; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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.
1. Scope* 3.1.1 diffuser, n—for gas, a device for dispersing gas into a
fluid.
1.1 This test method covers the determination of the foam-
3.1.1.1 Discussion—In this test method the diffuser may be
ing characteristics of lubricating oils at 24°C and 93.5°C.
made of either metallic or non-metallic materials.
Means of empirically rating the foaming tendency and the
3.1.2 entrained air (or gas), n—in liquids, a two-phase
stability of the foam are described.
mixture of air (or gas) dispersed in a liquid in which the
1.2 The values stated in SI units are to be regarded as the
volume of the liquid is the major component.
standard. The values given in parentheses are for information
3.1.2.1 Discussion—The air (or gas) is in the form of
only.
discrete bubbles of about 10 to 1000 µm in diameter. The
1.3 This standard does not purport to address all of the
bubbles are not uniformly dispersed. In time they tend to rise
safety concerns, if any, associated with its use. It is the
tothesurfacetocoalescetoformlargerbubbleswhichbreakor
responsibility of the user of this standard to establish appro-
form foam. Subsurface coalescence can also occur, in which
priate safety and health practices and determine the applica-
case, the bubbles rise more rapidly.
bility of regulatory limitations prior to use. For specific
3.1.3 foam, n—in liquids, a collection of bubbles formed in
warning statements, see Sections 7, 8, and 9.1.1.
the liquid or on (at) its surface in which the air (or gas) is the
2. Referenced Documents major component on a volumetric basis.
2
3.1.4 lubricant, n—any material interposed between two
2.1 ASTM Standards:
surfaces that reduces friction or wear between them. D6082
D445 Test Method for Kinematic Viscosity of Transparent
3.1.4.1 Discussion—In this test method, the lubricant is an
and Opaque Liquids (and the Calculation of Dynamic
oil which may or may not contain additives such as foam
Viscosity)
inhibitors.
D6082 Test Method for High Temperature Foaming Char-
3.1.5 maximum pore diameter, n—in gas diffusion, the
acteristics of Lubricating Oils
diameter a capillary of circular cross section which is equiva-
E1 Specification forASTM Liquid-in-GlassThermometers
lent (with respect to surface tension effects) to the largest pore
E128 Test Method for Maximum Pore Diameter and Per-
of the diffuser under consideration.
meability of Rigid Porous Filters for Laboratory Use
3.1.5.1 Discussion—The pore dimension is expressed in
3. Terminology
micrometres in this test method.
3.1.6 permeability, n—in gas diffusion, the flow of gas,
3.1 Definitions:
through the gas diffuser.
3.1.6.1 Discussion—In this test method, the permeability is
measured at a pressure of 2.45 kPa (250 mm of water) in
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This test method is under the jurisdiction of ASTM Committee D02 on
millilitres per minute.
PetroleumProductsandLubricantsandisthedirectresponsibilityofSubcommittee
D02.06 on Analysis of Lubricants. 3.2 Definitions of Terms Specific to This Standard:
Current edition approved Dec. 1, 2005. Published January 2006. Originally
3.2.1 dynamic bubble, n—the first bubble to pass through
approved in 1946. Last previous edition approved in 2003 as D892–03.
and escape from the diffuser followed by a continuous succes-
In the IP, this test method is under the jurisdiction of the Standardization
sionofbubbleswhentestingforthemaximumporediameterin
Committee. This test method has been approved by the sponsoring committees and
accepted by the cooperating societies in accordance with established procedures.
Annex A1.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.1.1 Discussion—When a diffuser is immersed in a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
liquid, air can be trapped in the pores. It can escape eventually
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. or as soon as a pressure is applied to the diffuser.When testing
*A Summary of Changes section appears at the end of this standard.
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D892–05
FIG. 1 Foaming Test Appar
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