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ASTM D4616-23

Current Revision

Standard Test Method for Microscopical Analysis by Reflected Light and Determination of Mesophase in a Pitch

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1.1 This test method covers laboratory procedures for the preparation of granular and melted samples for microscopic analysis using reflected light to identify and estimate the amount and size of the mesophase.

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 Sometimes coal tar and petroleum pitches are heat treated thereby forming mesophase spheroids. The mesophase may be partially soluble in quinoline and cannot be estimated by the quinoline insoluble test (Test Method D2318). This test method provides for the identification, quantitative estimation, and size determination of mesophase spheroids.

5.2 The mesophase initially forms as spheroids that may coalesce to form a variety of asymmetrical shapes. The smallest mesophase particle that can be detected with certainty at 400× or 500× magnification is 4 μm in diameter; mesophase particles sizes less than 4 μm should be ignored. If mesophase material less than 4 μm in size is of interest, then magnifications of 1000× to 1800× shall be used and the results should be appropriately identified. This method is limited to determining minor levels of mesophase, that is, 20 % mesophase.

SDO ASTM: ASTM International
Document Number D4616
Publication Date Oct. 1, 2023
Language en - English
Page Count 11
Revision Level 23
Supercedes
Committee D02.05
Publish Date Document Id Type View
Oct. 1, 2023 D4616-23 Revision
Jan. 1, 2000 D4616-95R00 Revision
Jan. 1, 2000 D4616-95 Revision
Dec. 1, 2018 D4616-95R18 Reaffirmation
May 1, 2013 D4616-95R13 Reaffirmation
Dec. 1, 2008 D4616-95R08 Reaffirmation
May 1, 2005 D4616-95R05 Reaffirmation