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ASTM D61-24

Current Revision

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

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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, 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.


5.1 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.

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

SDO ASTM: ASTM International
Document Number D61
Publication Date Oct. 1, 2024
Language en - English
Page Count 4
Revision Level 24
Supercedes
Committee D02.05
Publish Date Document Id Type View
Oct. 1, 2024 D0061-24 Revision
July 1, 2015 D0061-15 Revision
Dec. 1, 2019 D0061-15R19 Reaffirmation
Feb. 15, 2010 D0061-75R10 Reaffirmation
Nov. 1, 2004 D0061-75R04 Reaffirmation
Dec. 10, 1999 D0061-75R99 Reaffirmation