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ISO 7404-4:2017

Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition

Aug 9, 2017
95.99   Withdrawal of Standard   Oct 27, 2025

General information

95.99     Oct 27, 2025

ISO

ISO/TC 27/SC 5

International Standard

73.040  

English  

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Scope

ISO 7404-4:2017 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 (about 400 nm to 700 nm). Additional blue, blue-violet or UV light excitation (365 nm to 440 nm) for better identification of liptinite in fluorescence may be used especially at low rank coals.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7404-4:1988

NOW

WITHDRAWN
ISO 7404-4:2017
95.99 Withdrawal of Standard
Oct 27, 2025

REVISED BY

PUBLISHED
ISO 7404-4:2025

National adoptions

Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition

90.92   Standard to be revised

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