ASTM D5305 - 18

    Standard Test Method for Determination of Ethyl Mercaptan in LP-Gas Vapor

    Active Standard ASTM D5305 | Developed by Subcommittee: D02.H0

    Book of Standards Volume: 05.02


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    Significance and Use

    5.1 LP-gas is colorless and odorless, and not detectable by normal human senses. To provide an olfactory warning in the event of a leak, LP-gas intended for domestic or commercial fuel use is intentionally odorized so as to be readily detectable well below flammable or suffocating concentration levels of LP-gas in air. (See Appendix X1 for important explanations.) The most common odorant for LP-gas is ethyl mercaptan. The field use of this test method will rapidly determine the presence and concentration of ethyl mercaptan in LP-gas vapor without the necessity for complex laboratory equipment.

    1. Scope

    1.1 This test method describes a rapid and simple procedure using length-of-stain tubes for field measurement of ethyl mercaptan in the vapor phase of LP-gas systems. Although length-of-stain tubes are available to detect ethyl mercaptan concentrations in the range of 0.5 to 120 parts per million by volume, this test method is specifically applicable to systems containing 5 ppm by volume or more of ethyl mercaptan in LP-gas vapors.

    Note 1: A chromatographic technique can be used for more precise, quantitative determination of ethyl mercaptan in LP-gas.

    1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    NFPA Standard

    NFPA 58


    ICS Code

    ICS Number Code 75.160.30 (Gaseous fuels)

    UNSPSC Code

    UNSPSC Code 15111510(Liquified petroleum gas)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D5305-18

    Citation Format

    ASTM D5305-18, Standard Test Method for Determination of Ethyl Mercaptan in LP-Gas Vapor, ASTM International, West Conshohocken, PA, 2018, www.astm.org

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