5.1 Blocks or briquets of coke prepared in accordance with the laboratory procedures of this practice will have flat, scratch-free surfaces suitable for examination with a microscope using reflected light illumination. The polished surface of the blocks or briquets prepared using this practice will contain particles representative of the original gross sample. Polished blocks of coke will preserve the porosity and undisturbed distributions of carbon forms required in the production of sequences of stitched and tiled image mosaics. Such images are required for microscopic porosity measurement. Microstructure and microtexture of coke have a strong influence on the coke strength, and the properties of the metallurgical coke in terms of its use in industrial applications.

5.2 Samples prepared by this practice are used for microscopical determination of the textural components in coke (see Test Method D5061) and the measurement of coke reflectance. Major uses for metallurgical coke examination are in quality analysis to ensure coke production requirements, and in research and development.

1.1 This practice covers laboratory procedures for the preparation of granular and lump coke into block and briquet samples for examination with a reflected light microscope. The samples prepared are used for examination and identification of the components in coke microtexture, the measurement of the reflectance of coke, and the analysis of coke microstructure.

Note 1: Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size

1.2 Units—The values stated in either SI units or inch-pound units, or other non-SI units, are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other and values from the two systems shall not be combined.

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.