International Standard
ISO 7404-4:2017
Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition
Reference number
ISO 7404-4:2017
Edition 2
2017-08
© ISO 2024
International Standard
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Published (Edition 2, 2017)
This standard was last reviewed and confirmed in 2023. Therefore this version remains current.

ISO 7404-4:2017

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CHF 63
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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2017-08
    Stage
    : International Standard to be revised [90.92]
  • Edition
     : 2
    Number of pages
     : 9
  • Technical Committee :
    ISO/TC 27/SC 5
    ICS :
    73.040 
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