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Overview ISO 7404-3:2025 - Coal - Methods for petrographic analysis - Part 3 specifies a standardized, microscope-based method for determining maceral group composition in coal. The procedure applies…
Overview ISO 7404-3:2009 specifies a standardized petrographic method for determining the maceral group composition of coals. The procedure applies to polished particulate blocks examined under refle…
1 Scope This part of ISO 7404 specifies a method for determining the proportions of the maceral groups (and the minerals, if desired) in coals. It is concerned only with determinations made on polish…