ASTM D6082-01
(Test Method)Standard Test Method for High Temperature Foaming Characteristics of Lubricating Oils
Standard Test Method for High Temperature Foaming Characteristics of Lubricating Oils
SCOPE
1.1 This test method describes the procedure for determining the foaming characteristics of lubricating oils (specifically transmission fluid and motor oil) at 150°C.
1.2 Foaming characteristics of lubricating oils at temperatures up to 93.5°C are determined by Test Method D 892 or IP 146 .
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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 hazard statements, see Section 8.
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An American National Standard
Designation:D6082–01
Standard Test Method for
High Temperature Foaming Characteristics of Lubricating
1
Oils
This standard is issued under the fixed designation D6082; 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.
1. Scope 3.1.2 entrained air (or gas), n—in liquids, a two-phase
mixture of air (or gas) dispersed in a liquid in which the liquid
1.1 This test method describes the procedure for determin-
is the major component on a volumetric basis.
ing the foaming characteristics of lubricating oils (specifically
3.1.2.1 Discussion—The air (or gas) is in the form of
transmission fluid and motor oil) at 150°C.
discrete bubbles of about 10 to 1000 µm in diameter. The
1.2 Foaming characteristics of lubricating oils at tempera-
bubbles are not uniformly dispersed. In time, they rise to the
tures up to 93.5°C are determined byTest Method D892 or IP
surfacetocoalescetoformlargerbubbleswhichbreakorform
146 .
foam. Subsurface coalescence can also occur, in which case,
1.3 The values stated in SI units are to be regarded as the
the bubbles will rise more rapidly.
standard.
3.1.3 foam, n—in liquids, a collection of bubbles formed in
1.4 This standard does not purport to address all of the
oronthesurfaceofaliquidinwhichtheairorgasisthemajor
safety concerns, if any, associated with its use. It is the
component on a volumetric basis.
responsibility of the user of this standard to establish appro-
3.1.4 gas, n—a fluid (such as air) that has neither indepen-
priate safety and health practices and determine the applica-
dent shape nor volume but tends to expand indefinitely.
bility of regulatory limitations prior to use. For specific hazard
3.1.5 lubricant, n—any material interposed between two
statements, see Section 8.
surfaces that reduces friction or wear between them.
2. Referenced Documents
3.1.5.1 Discussion—In this test method, the lubricant is an
oil which may or may not contain additives such as foam
2.1 ASTM Standards:
inhibitors.
D892 Test Method for Foaming Characteristics of Lubri-
2
3.1.6 maximum pore diameter, n—in gas diffusion, the
cating Oils
3
diameter of a capillary of circular cross-section which is
E1 Specification for ASTM Thermometers
equivalent (with respect to surface tension effects) to the
E128 Test Method for Maximum Pore Diameter and Per-
4
largest pore of the diffuser under consideration. The pore
meability of Rigid Porous Filters for Laboratory Use
5
dimension is expressed in micrometers (µm).
2.2 Institute of Petroleum Standards:
3.1.7 permeability, n—in gas diffusion, the rate of a sub-
IP146 Standard Method ofTest for Foaming Characteristics
stance that passes through a material (diffuser) under given
of Lubricating Oils
conditions.
3. Terminology
3.2 Definitions of Terms Specific to This Standard:
3.2.1 collapse time, n—in foam testing,thetimeinseconds,
3.1 Definitions:
for zero foam to appear after the air is disconnected at the end
3.1.1 diffuser, n—for gas, a device for dispersing gas into a
of the five minute air blowing time.
liquid (Test Method D892).
3.2.2 dynamic bubble, n—the first bubble to pass through
3.1.1.1 Discussion—Although diffusers can be made of
and escape from the diffuser followed by a continuous succes-
eithermetallicornon-metallicmaterials,inthistestmethodthe
sion of bubbles when testing for the pore diameter in Annex
diffuser is sintered stainless steel.
A1.
3.2.2.1 Discussion—Whenadiffuserisimmersedinaliquid
1
This test method is under the jurisdiction of ASTM Committee D02 on
such as propan-2-ol, air can be trapped in the pores. It can
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
escape eventually or as soon as a pressure is applied to the
D02.06 on Analysis of Lubricants.
Current edition approved Nov. 10, 2001. Published January 2002. Originally
diffuser. When testing for pore diameter (Annex A1), the
published as D6082–97. Last previous edition D6082–00.
escape of such bubbles is to be ignored.
2
Annual Book of ASTM Standards, Vol 05.01.
3 3.2.3 foam stability, n—in foam testing,theamountofstatic
Annual Book of ASTM Standards, Vol 14.03.
4
foam remaining at specified times following the disconnecting
Annual Book of ASTM Standards, Vol 14.02.
5
Available from Institute of Petroleum, 61 New Cavendish St., London, WIG
of the air supply.
7AR, U.K.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6082–01
3.2.3.1 five-second foam stability—the amount of static 3.2.8.2 final total
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