ASTM D525-01
(Test Method)Standard Test Method for Oxidation Stability of Gasoline (Induction Period Method)
Standard Test Method for Oxidation Stability of Gasoline (Induction Period Method)
SCOPE
1.1 This test method covers the determination of the stability of gasoline in finished form only, under accelerated oxidation conditions. (Warning- This test method is not intended for determining the stability of gasoline components, particularly those with a high percentage of low boiling unsaturated compounds, as these may cause explosive conditions within the apparatus. However, because of the unknown nature of certain samples, the pressure vessel assembly shall include a safety burst-disc in order to safeguard the operator.)Note 1--For measurement of oxidation stability of gasoline by measurement of potential gum, refer to Test Method D 873, or IP Test Method 138.Note 2--The precision data were developed with gasolines derived from hydrocarbon sources only without oxygenates.
1.2 The accepted SI unit of pressure is the kilo Pascal (kPa); and for temperature in C.
1.3 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.
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An American National Standard
Designation:D525–01 British Standard 4347
Designation: 40/97
Standard Test Method for
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Oxidation Stability of Gasoline (Induction Period Method)
This standard is issued under the fixed designation D 525; 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.
This test method has been approved by the sponsoring aommittees and accepted by the Cooperating Societies in accordance with
established procedures.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope E 1 Specification for ASTM Thermometers
2.2 IP Standards:
1.1 This test method covers the determination of the stabil-
IP-138 Test Method for Oxidation Stability, Aviation Gaso-
ity of gasoline in finished form only, under accelerated oxida-
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2 line
tion conditions. (Warning— This test method is not intended
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Part IV—Petroleum and its Products
for determining the stability of gasoline components, particu-
larly those with a high percentage of low boiling unsaturated
3. Terminology
compounds, as these may cause explosive conditions within
3.1 Definitions of Terms Specific to This Standard:
the apparatus. However, because of the unknown nature of
3.1.1 break point—the point in the pressure-time curve that
certain samples, the pressure vessel assembly shall include a
is preceded by a pressure drop of exactly 14 kPa within 15 min
safety burst-disc in order to safeguard the operator.)
and succeeded by a drop of not less than 14 kPa in 15 min.
NOTE 1—For measurement of oxidation stability of gasoline by mea-
3.1.2 induction period—the time elapsed between the plac-
surement of potential gum, refer to Test Method D 873, or IP Test
ing of the pressure vessel in the bath and the break point at
Method 138.
100°C.
NOTE 2—The precision data were developed with gasolines derived
from hydrocarbon sources only without oxygenates.
4. Summary of Test Method
1.2 The accepted SI unit of pressure is the kilo Pascal (kPa);
4.1 The sample is oxidized in a pressure vessel initially
and for temperature in °C.
filled at 15 to 25°C with oxygen pressure at 690 to 705 kPa and
1.3 This standard does not purport to address all of the
heated at a temperature between 98 and 102°C.The pressure is
safety concerns, if any, associated with its use. It is the
recorded continuously or read at stated intervals until the
responsibility of the user of this standard to establish appro-
breakpoint is reached. The time required for the sample to
priate safety and health practices and determine the applica-
reach this point is the observed induction period at the
bility of regulatory limitations prior to use.
temperature of test, from which the induction period at 100°C
canbecalculated.(Warning—Inadditiontootherprecautions,
2. Referenced Documents
to provide protection against the possibility of explosive
2.1 ASTM Standards:
rupture of the pressure vessel, the pressure vessel should be
D 873 TestMethodforOxidationStabilityofAviationFuels
operated behind an appropriate safety shield.)
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(Potential Residue Method)
D 4057 Practice for Manual Sampling of Petroleum and
5. Significance and Use
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Petroleum Products
5.1 Theinductionperiodmaybeusedasanindicationofthe
tendency of motor gasoline to form gum in storage. It should
be recognized, however, that its correlation with the formation
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.14 on Stability and Cleanliness of Liquid Fuels.
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Current edition approved June 10, 2001. Published July 2001. Originally Annual Book of ASTM Standards, Vol 14.03.
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published as D 525 – 39 T. Last previous edition D 525 – 00. Available from Institute of Petroleum, 61 New Cavendish St., London WIM,
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Further information can be found in the June 1978, January 1979, and June 8AR U.K.
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1986 editions of the Institute of Petroleum Review. Aconvenienttemplateformeasuringthebreakpointisdescribedinthepaperby
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Annual Book of ASTM Standards, Vol 05.01. Korb, E. L., “Induction Period Calculator,” ASTM Bulletin, No. 153, August 1948,
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Annual Book of ASTM Standards, Vol 05.02. pp. 99–102.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D525
of gum in storage may vary markedly under different storage and all connecting lines shall be thoroughly dry before each
conditions and with different gasolines. test is started. (Warning—Volatile peroxides which may have
formed during a previous
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