ASTM D61 - 75(2010)

    Standard Test Method for Softening Point of Pitches (Cube-in-Water Method)

    Active Standard ASTM D61 | Developed by Subcommittee: D02.05

    Book of Standards Volume: 05.01


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    ASTM D61

    Significance and Use

    Pitch does not go through a solid-liquid phase change when heated, and therefore it does not have a true melting point. As the temperature rises, pitch softens and becomes less viscous. The softening point is arbitrarily defined and shall be established by a closely controlled method which shall be carefully followed if test results are to be reproducible.

    This test is useful in determining the consistency of pitch as one element in establishing the uniformity of shipments or sources of supply.

    1. Scope

    1.1 This test method covers the determination of the softening point of pitches below 176°F (80°C). Pitches of higher softening point should be tested by Test Method D2319 or Test Method D3104.

    1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that 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 and health practices and determine the applicability of regulatory limitations prior to use.


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

    ASTM Standards

    D140 Practice for Sampling Bituminous Materials

    D2319 Test Method for Softening Point of Pitch (Cube-in-Air Method)

    D3104 Test Method for Softening Point of Pitches (Mettler Softening Point Method)

    E1 Specification for ASTM Liquid-in-Glass Thermometers


    ICS Code

    ICS Number Code 75.140 (Waxes, bituminous materials and other petroleum products)

    UNSPSC Code

    UNSPSC Code 30121602(Pitch)


    DOI: 10.1520/D0061-75R10

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