ASTM D7097-05

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An American National Standard
Designation:D7097–05
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 2. Referenced Documents
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1.1 This test method covers the procedure to determine the 2.1 ASTM Standards:
mass of deposit formed on a specially constructed test rod D 4485 Specification for Performance of Engine Oils
exposedtorepetitivepassageof8.5gofengineoilovertherod D 6335 Test Method for Determination of High Tempera-
inathinfilmunderoxidativeandcatalyticconditionsat285°C. ture Deposits byThermo-Oxidation Engine Oil Simulation
The range of applicability of the Moderately HighTemperature Test
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Thermo-Oxidation EngineTest (TEOSTMHT ) test method as
3. Terminology
derived from an interlaboratory study is approximately 10 to
3.1 Definitions of Terms Specific to This Standard:
100 mg. However, experience indicates that deposit values
from 1 to 150 mg or greater may be obtained. 3.1.1 bubble airflow gage, n—a precision bore glass tube
marked in tenths of a millilitre used to measure accurately the
1.2 Thistestmethodusesapatentedinstrument,methodand
patented, numbered, and registered depositor rods traceable to flow rate of air around and past the depositor rod and to
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calibrate mass air flow controllers recommended for use in the
the manufacturer and made specifically for the practice and
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precision of the test method. procedure.
3.1.2 depositor rod deposits, n—particulate matter formed
NOTE 1—ASTM International takes no position respecting the validity
on the depositor rod surface by oxidation of the thin film of
ofanypatentrightsassertedinconnectionwithanyitemmentionedinthis
passingoilexposedtotherodtemperatureandair,andweighed
standard. Users of this standard are expressly advised that determination
after appropriate washing and drying to obtain the net mass
of the validity of any such patent rights, and the risk of infringement of
such rights, are entirely their own responsibility. gain.
3.1.3 filter deposits, n—particulates washed from the de-
1.3 The values stated in SI units are to be regarded as
positor rod after the test and collected on a special multi-layer
standard.Although not an SI unit, the special name, litre (L) is
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filter cartridge.
allowed by SI for the cubic decimetre (dm ) and the millilitre
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3.1.4 MHT , n—an acronym for moderately high tempera-
(mL) for the SI cubic centimetre (cm ).
ture.
1.4 This standard does not purport to address all of the
3.1.4.1 Discussion—The TEOST MHT procedure evaluates
safety concerns, if any, associated with its use. It is the
deposit formation at temperatures that are closely related to
responsibility of the user of this standard to establish appro-
those of the piston ring zone in reciprocating engines (as
priate safety and health practices and determine the applica-
distinguished from the much higher temperatures associated
bility of regulatory limitations prior to use.
with the TEOST 33C, Test Method D 6335, procedure for
determining potential deposits in turbochargers).
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3.1.5 TEOST , n—an acronym for Thermo-Oxidation En-
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
gine Oil Simulation Test.
D02.09.0G on Oxidation Testing of Engine Oils.
3.1.6 total rod deposits, n—the mass of deposits collected
Current edition approved April 1, 2005. Published May 2005.
2 on the depositor rod deposits plus any mass of deposits washed
TEOST and MHT are registered trademarks of the Tannas Co. (Reg. 2001396).
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The sole source of supply of the apparatus known to the committee at this time from the depositor rod and later extracted on a filter.
is Tannas Company, 4800 James Savage Rd., Midland, MI 48642. If you are aware
3.1.7 volatilized oil, n—oil vapor coalesced on the mantle
of alternative suppliers, please provide this information to ASTM International
wall, and subsequently collected in a vial.
Headquarters.Your comments will receive careful consideration at a meeting of the
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responsible technical committee, which you may attend.
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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 A
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