ASTM D6082-97
(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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NOTICE: This standard has either been superseded and replaced by a new version or
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Designation: D 6082 – 97 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
High Temperature Foaming Characteristics of Lubricating
1
Oils
This standard is issued under the fixed designation D 6082; 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.
1. Scope 3.1.2.1 Discussion—The air (or gas) is in the form of
discrete bubbles of about 10 to 1000 μm in diameter. The
1.1 This test method describes the procedure for determin-
bubbles are not uniformly dispersed. In time, they rise to the
ing the foaming characteristics of lubricating oils (specifically
surface to coalesce to form larger bubbles which break or form
transmission fluid and motor oil) at 150°C.
foam. Subsurface coalescence can also occur, in which case,
1.2 Foaming characteristics of lubricating oils at tempera-
the bubbles will rise more rapidly.
tures up to 93.5°C are determined by Test Method D 892.
3.1.3 foam, n—in liquids, a collection of bubbles formed in
1.3 This standard does not purport to address all of the
or on the surface of a liquid in which the air or gas is the major
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.
1.4 The values stated in SI units are to be regarded as the
3.1.5.1 Discussion—In this test method, the lubricant is an
standard.
oil which may or may not contain additives such as foam
2. Referenced Documents
inhibitors.
2.1 ASTM Standards:
3.1.6 maximum pore diameter, n—in gas diffusion, the
D 892 Test Method for Foaming Characteristics of Lubri-
diameter of a capillary of circular cross-section which is
2
cating Oils
equivalent (with respect to surface tension effects) to the
3
D 1193 Specification for Reagent Water
largest pore of the diffuser under consideration. The pore
E 128 Test Method for Maximum Pore Diameter and Per-
dimension is expressed in micrometers (μm).
4
meability of Rigid Porous Filters for Laboratory Use
3.1.7 permeability, n—in gas diffusion, the rate of a sub-
5
2.2 Institute of Petroleum Standards:
stance that passes through a material (diffuser) under given
IP146 Standard Method of Test for Foaming Characteristics
conditions.
of Lubricating Oils
3.2 Definitions of Terms Specific to This Standard:
3.2.1 collapse time, n—in foam testing, the time in seconds,
3. Terminology
for zero foam to appear after the air is disconnected at the end
3.1 Definitions:
of the five minute air blowing time.
3.1.1 diffuser, n—for gas, a device for dispersing gas into a
3.2.2 dynamic bubble, n—the first bubble to pass through
liquid (Test Method D 892).
and escape from the diffuser followed by a continuous succes-
3.1.1.1 Discussion—Although diffusers can be made of
sion of bubbles when testing for the pore diameter in Annex
either metallic or non-metallic materials, in this test method the
A1.
diffuser is sintered stainless steel.
3.2.2.1 Discussion—When a diffuser is immersed in a liquid
3.1.2 entrained air (or gas), n—in liquids, a two-phase
such as propan-2-ol, air can be trapped in the pores. It can
mixture of air (or gas) dispersed in a liquid in which the liquid
escape eventually or as soon as a pressure is applied to the
is the major component on a volumetric basis.
diffuser. When testing for pore diameter (Annex A1), the
escape of such bubbles is to be ignored.
1
This test method is under the jurisdiction of ASTM Committee D-2 on
3.2.3 foam stability, n—in foam testing, the amount of static
Petroleum and Lubricants and is the direct responsibility of Subcommittee D02.06
foam remaining at specified times following the disconnecting
on Analysis of Lubricants.
of the air supply.
Current edition approved Jan. 10, 1997. Published August 1997.
2
Annual Book of ASTM Standards, Vol 05.01. 3.2.3.1 five-second foam stability—the amount of static
3
Annual Book of ASTM Standards, Vol 11.01.
foam present 5 s after disconnecting the air supply.
4
Annual Book of ASTM Standards, Vol 14.02.
5
3.2.3.2 fifteen-second foam stability—the amount of static
Available from Institute of Petroleum, 61
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