Coal — Methods for petrographic analysis — Part 3: Method of determining maceral group composition
NORMA vydána dne 27.10.2025
Označení normy: ISO 7404-3:2025-ed.4.0
Datum vydání normy: 27.10.2025
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Mezinárodní technická norma
Kategorie: 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.