ASTM D7097-06a

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An American National Standard
Designation:D7097–06a
Standard Test Method for
Determination of Moderately High Temperature Piston
Deposits by Thermo-Oxidation Engine Oil Simulation Test—
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TEOST MHT
This standard is issued under the fixed designation D 7097; 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* responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
1.1 This test method covers the procedure to determine the
bility of regulatory limitations prior to use.
mass of deposit formed on a specially constructed test rod
exposedtorepetitivepassageof8.5gofengineoilovertherod
2. Referenced Documents
inathinfilmunderoxidativeandcatalyticconditionsat285°C.
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2.1 ASTM Standards:
The range of applicability of the Moderately HighTemperature
2 D 4485 Specification for Performance of Engine Oils
Thermo-Oxidation EngineTest (TEOSTMHT ) test method as
D 6335 Test Method for Determination of High Tempera-
derived from an interlaboratory study is approximately 10 to
ture Deposits byThermo-Oxidation Engine Oil Simulation
100 mg. However, experience indicates that deposit values
Test
from 1 to 150 mg or greater may be obtained.
1.2 Thistestmethodusesapatentedinstrument,methodand
3. Terminology
patented, numbered, and registered depositor rods traceable to
3 3.1 Definitions of Terms Specific to This Standard:
the manufacturer and made specifically for the practice and
4 3.1.1 bubble airflow gage, n—a precision bore glass tube
precision of the test method.
marked in tenths of a millilitre used to measure accurately the
NOTE 1—ASTM International takes no position respecting the validity
flow rate of air around and past the depositor rod and to
ofanypatentrightsassertedinconnectionwithanyitemmentionedinthis
calibrate mass air flow controllers recommended for use in the
standard. Users of this standard are expressly advised that determination
procedure.
of the validity of any such patent rights, and the risk of infringement of
3.1.2 depositor rod deposits, n—particulate matter formed
such rights, are entirely their own responsibility.
on the depositor rod surface by oxidation of the thin film of
1.3 The values stated in SI units are to be regarded as
passingoilexposedtotherodtemperatureandair,andweighed
standard.Although not an SI unit, the special name, litre (L) is
after appropriate washing and drying to obtain the net mass
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allowed by SI for the cubic decimetre (dm ) and the millilitre
gain.
3
(mL) for the SI cubic centimetre (cm ).
3.1.3 filter deposits, n—particulates washed from the de-
1.4 This standard does not purport to address all of the
positor rod after the test and collected on a special multi-layer
safety concerns, if any, associated with its use. It is the
filter cartridge.
2
3.1.4 MHT , n—an acronym for moderately high tempera-
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ture.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
3.1.4.1 Discussion—The TEOST MHT procedure evaluates
D02.09.0G on Oxidation Testing of Engine Oils.
deposit formation at temperatures that are closely related to
Current edition approved Dec. 1, 2006. Published January 2007. Originally
those of the piston ring zone in reciprocating engines (as
approved in 2005. Last previous edition approved in 2006 as D 7097–06.
2
TEOST and MHT are registered trademarks of the Tannas Co. (Reg. 2001396). distinguished from the much higher temperatures associated
3
The sole source of supply of the apparatus known to the committee at this time
with the TEOST 33C, Test Method D 6335, procedure for
is Tannas Company, 4800 James Savage Rd., Midland, MI 48642. If you are aware
determining potential deposits in turbochargers).
of alternative suppliers, please provide this information to ASTM International
Headquarters.Your comments will receive careful consideration at a meeting of the
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responsible technical committee, which you may attend.
4
The TEOST instrument, method and rod are patented. Interested parties are
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invited to submit information regarding the identification of an alternative(s) to this For referenced ASTM standards, visit the ASTM website, www.astm.org, or
patented technology to ASTM Headquarters. Your comments will receive careful contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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consideration at a meeting of the responsible technical committee, which you may Standards volume information, refer to the standard’s Document Summary page on
attend. the ASTM website.
*A Summary of Chang
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