International Standard
ISO 7404-4:2025
Coal — Methods for petrographic analysis — Part 4: Method of determining microlithotype, carbominerite and minerite composition
Reference number
ISO 7404-4:2025
Edition 3
2025-10
Preview
ISO 7404-4:2025
87003
No disponible en español
Publicado (Edición 3, 2025)

ISO 7404-4:2025

ISO 7404-4:2025
87003
Idioma
Formato
CHF 67

Resumen

This document specifies a method, using a graticule with 20 crossline intersections, for determining the proportions of microlithotypes, carbominerite and minerite in coals. It applies only to determinations made on polished particulate blocks using reflected white light. Additional blue, blue-violet or UV light excitation for better identification of liptinite in fluorescence can be used especially for low rank coals.

Informaciones generales

  •  : Publicado
     : 2025-10
    : Norma Internacional publicada [60.60]
  •  : 3
     : 9
  • ISO/TC 27/SC 5
    73.040 
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