ASTM D525-05
(Test Method)Standard Test Method for Oxidation Stability of Gasoline (Induction Period Method)
Standard Test Method for Oxidation Stability of Gasoline (Induction Period Method)
SIGNIFICANCE AND USE
The induction period may be used as an indication of the tendency of motor gasoline to form gum in storage. It should be recognized, however, that its correlation with the formation of gum in storage may vary markedly under different storage conditions and with different gasolines.
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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Standards Content (Sample)
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British Standard 4347
Designation:D525–05
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 D525; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
1.1 This test method covers the determination of the stabil-
E1 Specification for ASTM Liquid-in-Glass Thermometers
ity of gasoline in finished form only, under accelerated oxida-
2 2.2 Energy Institute Standards:
tion conditions. (Warning—This test method is not intended
IP-138 Test Method for Oxidation Stability, Aviation Gaso-
for determining the stability of gasoline components, particu-
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line
larly those with a high percentage of low boiling unsaturated
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Part IV—Petroleum and its Products
compounds, as these may cause explosive conditions within
the apparatus. However, because of the unknown nature of
3. Terminology
certain samples, the pressure vessel assembly shall include a
3.1 Definitions of Terms Specific to This Standard:
safety burst-disc in order to safeguard the operator.)
3.1.1 break point—the point in the pressure-time curve that
NOTE 1—For measurement of oxidation stability of gasoline by mea-
is preceded by a pressure drop of exactly 14 kPa within 15 min
surement of potential gum, refer to Test Method D873,orIPTest
and succeeded by a drop of not less than 14 kPa in 15 min.
Method 138.
3.1.2 induction period—the time elapsed between the plac-
NOTE 2—The precision data were developed with gasolines derived
ing of the pressure vessel in the bath and the break point at
from hydrocarbon sources only without oxygenates.
100°C.
1.2 The accepted SI unit of pressure is the kilo Pascal (kPa),
and of temperature is °C.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 The sample is oxidized in a pressure vessel initially
safety concerns, if any, associated with its use. It is the
filledat15to25°Cwithoxygenpressureat690to705kPaand
responsibility of the user of this standard to establish appro-
heated at a temperature between 98 and 102°C.The pressure is
priate safety and health practices and determine the applica-
recorded continuously or read at stated intervals until the
bility of regulatory limitations prior to use.
breakpoint is reached. The time required for the sample to
reach this point is the observed induction period at the
2. Referenced Documents
temperature of test, from which the induction period at 100°C
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2.1 ASTM Standards:
canbecalculated.(Warning—Inadditiontootherprecautions,
D873 Test Method for Oxidation Stability ofAviation Fuels
to provide protection against the possibility of explosive
(Potential Residue Method)
rupture of the pressure vessel, the pressure vessel should be
operated behind an appropriate safety shield.)
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This test method is under the jurisdiction of ASTM Committee D02 on
5. Significance and Use
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.14 on Stability and Cleanliness of Liquid Fuels.
5.1 Theinductionperiodmaybeusedasanindicationofthe
This test method has been approved by the sponsoring aommittees and accepted
tendency of motor gasoline to form gum in storage. It should
by the Cooperating Societies in accordance with established procedures.
Current edition approved April 1, 2005. Published May 2005. Originally be recognized, however, that its correlation with the formation
approved in 1939. Last previous edition approved in 2001 as D525 – 01. DOI:
10.1520/D0525-05.
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Further information can be found in the June 1978, January 1979, and June
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1986 editions of the Institute of Petroleum Review. Available from Energy Institute, 61 New Cavendish St., London WIM, 8AR
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or U.K.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Aconvenienttemplateformeasuringthebreakpointisdescribedinthepaperby
Standards volume information, refer to the standard’s Document Summary page on Korb, E. L., “Induction Period Calculator,” ASTM Bulletin, No. 153, August 1948,
the ASTM website. pp. 99–102.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D525–05
of gum in storage may vary markedly under different storage and all connecting lines shall be thoroughly dry before each
cond
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