ASTM D6082-00
(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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Designation: D 6082 – 00 An American National Standard
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 mixture of air (or gas) dispersed in a liquid in which the liquid
is the major component on a volumetric basis.
1.1 This test method describes the procedure for determin-
3.1.2.1 Discussion—The air (or gas) is in the form of
ing the foaming characteristics of lubricating oils (specifically
discrete bubbles of about 10 to 1000 μm in diameter. The
transmission fluid and motor oil) at 150°C.
bubbles are not uniformly dispersed. In time, they rise to the
1.2 Foaming characteristics of lubricating oils at tempera-
surface to coalesce to form larger bubbles which break or form
tures up to 93.5°C are determined by Test Method D 892 or IP
foam. Subsurface coalescence can also occur, in which case,
146 .
the bubbles will rise more rapidly.
1.3 The values stated in SI units are to be regarded as the
3.1.3 foam, n—in liquids, a collection of bubbles formed in
standard.
or on the surface of a liquid in which the air or gas is the major
1.4 This standard does not purport to address all of the
component on a volumetric basis.
safety concerns, if any, associated with its use. It is the
3.1.4 gas, n—a fluid (such as air) that has neither indepen-
responsibility of the user of this standard to establish appro-
dent shape nor volume but tends to expand indefinitely.
priate safety and health practices and determine the applica-
3.1.5 lubricant, n—any material interposed between two
bility of regulatory limitations prior to use. For specific hazard
surfaces that reduces friction or wear between them.
statements, see Section 8.
3.1.5.1 Discussion—In this test method, the lubricant is an
2. Referenced Documents oil which may or may not contain additives such as foam
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-
2
diameter of a capillary of circular cross-section which is
cating Oils
3
equivalent (with respect to surface tension effects) to the
E 1 Specification for ASTM Thermometers
largest pore of the diffuser under consideration. The pore
E 128 Test Method for Maximum Pore Diameter and Per-
4
dimension is expressed in micrometers (μm).
meability of Rigid Porous Filters for Laboratory Use
5
3.1.7 permeability, n—in gas diffusion, the rate of a sub-
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. Terminology
3.2.1 collapse time, n—in foam testing, the time in seconds,
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
escape eventually or as soon as a pressure is applied to the
1
This test method is under the jurisdiction of ASTM Committee D02 on
diffuser. When testing for pore diameter (Annex A1), the
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
escape of such bubbles is to be ignored.
D02.06on Analysis of Lubricants.
Current edition approved Dec. 10, 2000. Published February 2001. Originally
3.2.3 foam stability, n—in foam testing, the amount of static
published as D 6082 – 97. Last previous edition D 6082 – 97.
foam remaining at specified times following the disconnecting
2
Annual Book of ASTM Standards, Vol 05.01.
3 of the air supply.
Annual Book of ASTM Standards, Vol 14.03.
4
Annual Book of ASTM Standards, Vol 14.02. 3.2.3.1 five-second foam stability—the amount of static
5
Available from Institute of Petroleum, 61 New Cavendish St., London, W.I.,
foam present 5 s after disconnecting the air supply.
England.
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