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ISO 7404-5:2025

Coal - Methods for petrographic analysis - Part 5: Method of determining microscopically the reflectance of vitrinite
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ISO 7404-5:2025

Coal - Methods for petrographic analysis - Part 5: Method of determining microscopically the reflectance of vitrinite

ISO 7404-5:2025

This document specifies the methods for determining the reflectance of vitrinite of coals microscopically on polished surfaces, immersed in oil. The methods are applicable to coals from single seams or coal blends covering the whole range of low-, medium- and high-rank coal.

Vitrinite reflectance measurements can be used to characterize the components within blends. Measures can be taken to correct for the vitrinite percentage within each of the components of the blend or to determine the proportion of components in a blend, particularly when the components have dissimilar vitrinite contents. This method necessitates the identification of vitrinite by the analyst.

Reflectance measurements on vitrinite, obtained by interpreting the results from an automated system, are outside the scope of this document.

SDO ISO: International Organization for Standardization
Document Number ISO 7404
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 27/SC 5
Publish Date Document Id Type View
Not Available ISO 7404-5:2025 Revision
Oct. 1, 2009 ISO 7404-5:2009 Revision