Coal — Methods for petrographic analysis — Part 3: Method of determining maceral group composition
NORMA vydaná dňa 27.10.2025
Označenie normy: ISO 7404-3:2025-ed.4.0
Dátum vydania normy: 27.10.2025
Počet strán: 8
Približná hmotnosť: 24 g (0.05 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO
Description / 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.