International Standard
ISO 7404-3:2025
Coal — Methods for petrographic analysis — Part 3: Method of determining maceral group composition
Reference number
ISO 7404-3:2025
Edition 4
2025-10
© ISO 2026
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Published (Edition 4, 2025)

ISO 7404-3:2025

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CHF 67
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Abstract

This document 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 polished particulate blocks using incident white light. For lower-rank coals, the additional use of the fluorescence mode is necessary to identify liptinites.

General information

  • Status
     : Published
    Publication date
     : 2025-10
    Stage
    : International Standard published [60.60]
  • Edition
     : 4
    Number of pages
     : 8
  • Technical Committee :
    ISO/TC 27/SC 5
    ICS :
    73.040 
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