ASTM D525-12a(2019)

Standard Test Method for Oxidation Stability of Gasoline (Induction Period Method)

SIGNIFICANCE AND USE
5.1 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 method2 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 D873, 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 of temperature is °C.  
1.3 WARNING—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use Caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Nov-2019
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.14 - Stability, Cleanliness and Compatibility of Liquid Fuels

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D525 − 12a (Reapproved 2019) British Standard 4347
Designation: 40/97
Standard Test Method for
1
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 U.S. Department of Defense.
1. Scope priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This test method covers the determination of the stabil-
1.5 This international standard was developed in accor-
ity of gasoline in finished form only, under accelerated oxida-
2
dance with internationally recognized principles on standard-
tion conditions. (Warning—This test method is not intended
ization established in the Decision on Principles for the
for determining the stability of gasoline components, particu-
Development of International Standards, Guides and Recom-
larly those with a high percentage of low boiling unsaturated
mendations issued by the World Trade Organization Technical
compounds, as these may cause explosive conditions within
Barriers to Trade (TBT) Committee.
the apparatus. However, because of the unknown nature of
certain samples, the pressure vessel assembly shall include a
2. Referenced Documents
safety burst-disc in order to safeguard the operator.)
3
2.1 ASTM Standards:
NOTE 1—For measurement of oxidation stability of gasoline by
measurement of potential gum, refer to Test Method D873,orIPTest D873 Test Method for Oxidation Stability of Aviation Fuels
Method 138.
(Potential Residue Method)
NOTE 2—The precision data were developed with gasolines derived
D4057 Practice for Manual Sampling of Petroleum and
from hydrocarbon sources only without oxygenates.
Petroleum Products
1.2 The accepted SI unit of pressure is the kilo Pascal (kPa),
E1 Specification for ASTM Liquid-in-Glass Thermometers
and of temperature is °C.
4
2.2 Energy Institute Standards:
1.3 WARNING—Mercury has been designated by many
IP-138 Test Method for Oxidation Stability, Aviation Gaso-
regulatory agencies as a hazardous substance that can cause
line
5
serious medical issues. Mercury, or its vapor, has been dem-
Part IV— Petroleum and its Products
onstrated to be hazardous to health and corrosive to materials.
Use Caution when handling mercury and mercury-containing
3. Terminology
products. See the applicable product Safety Data Sheet (SDS)
3.1 Definitions of Terms Specific to This Standard:
for additional information. The potential exists that selling
3.1.1 break point, n—the point in the pressure-time curve
mercury or mercury-containing products, or both, is prohibited
that is preceded by a pressure drop of exactly 14 kPa within
by local or national law. Users must determine legality of sales
15 min and succeeded by a drop of not less than 14 kPa in
in their location.
15 min.
1.4 This standard does not purport to address all of the
3.1.2 induction period, n—the time elapsed between the
safety concerns, if any, associated with its use. It is the
placing of the pressure vessel in the bath and the break point at
responsibility of the user of this standard to establish appro-
100 °C.
1
This test method is under the jurisdiction of ASTM Committee D02 on
3
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
This test method has been approved by the sponsoring committees and accepted Standards volume information, refer to the standard’s Document Summary page on
by the Cooperating Societies in accordance with established procedures. the ASTM website.
4
Current edition approved Dec. 1, 2019. Published December 2019. Originally Available from Energy Institute, 61 New Cavendish St., London WIM, 8AR
approved in 1939. Last previous edition approved in 2012 as D525 – 12a. DOI: U.K.
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10.1520/D0525-12AR19. Aconvenienttemplateformeasuringthebreakpointisdescribedinthepaperby
2
Further information can be found in the June 1978, January 1979, and June Korb, E. L., “Induction Period Calculator,” ASTM Bulletin, No. 153, August 1948,
1986 editions of the Institute of Petroleum Review. pp. 99–102.
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