ASTM D2268 - 93(2013)

    Standard Test Method for Analysis of High-Purity n-Heptane and Isooctane by Capillary Gas Chromatography

    Active Standard ASTM D2268 | Developed by Subcommittee: D02.04.0L

    Book of Standards Volume: 05.01


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    ASTM D2268

    Significance and Use

    3.1 This test method is used for specification analysis of high-purity n-heptane and isooctane, which are used as ASTM Knock Test Reference Fuels. Hydrocarbon impurities or contaminants, which can adversely affect the octane number of these fuels, are precisely determined by this method.

    1. Scope

    1.1 This test method covers and provides for the analysis of high-purity (greater than 99.5 % by volume) n -heptane and isooctane (2,2,4-trimethylpentane), which are used as primary reference standards in determining the octane number of a fuel. Individual compounds present in concentrations of less than 0.01 % can be detected. Columns specified by this test method may not allow separation of all impurities in reference fuels.

    1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    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.


    ICS Code

    ICS Number Code 71.080.10 (Aliphatic hydrocarbons)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D2268

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