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ASTM D4616 - 95(2018)
Standard Test Method for Microscopical Analysis by Reflected Light and Determination of Mesophase in a Pitch
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Significance and Use
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.
1. Scope
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.
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
D329 Specification for Acetone
D1160 Test Method for Distillation of Petroleum Products at Reduced Pressure
D2318 Test Method for Quinoline-Insoluble (QI) Content of Tar and Pitch
D3104 Test Method for Softening Point of Pitches (Mettler Softening Point Method)
D4296 Practice for Sampling Pitch
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
ICS Code
ICS Number Code 91.100.50 (Binders. Sealing materials)
UNSPSC Code
UNSPSC Code 30121602(Pitch)
Referencing This Standard
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DOI: 10.1520/D4616-95R18
Citation Format
ASTM D4616-95(2018), Standard Test Method for Microscopical Analysis by Reflected Light and Determination of Mesophase in a Pitch, ASTM International, West Conshohocken, PA, 2018, www.astm.org
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