ASTM WK43774

    New Test Method for Diesel Exhaust Fluid - Determination of Concentration with a Hydrometer

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    Developed by Subcommittee: D15.25 | Committee D15 | Contact Staff Manager


    1. Scope

    This test method covers a technique for field testing with a Hydrometer the concentration of aqueous urea-based diesel exhaust fluid (DEF)prescribed for use in diesel engines equipped with selective catalytic reduction technology and is not intended to circumvent or replace the more accurate determination of urea content by refractive index laboratory method, described in ISO 22241-2, Annex C This test method is designed solely as a quantitative test to determine the concentration of urea in DEF and does not purport to determine the quality of DEF nor to detect trace or other contaminants therein. Biuret content of DEF creates a known bias in this method. See section 9.2.1 for details.


    DEF; diesel exhaust fluid; disc fluid tester; SCR; selective catalytic reduction; urea

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Ron Schornstein

    Draft Under Development