Draft
International Standard
ISO/DIS 7404-4
Coal — Methods for petrographic analysis — Part 4: Method of determining microlithotype, carbominerite and minerite composition
Reference number
ISO/DIS 7404-4
Edition 3
© ISO 2024
Draft International Standard
Under development
This Draft International Standard is in the enquiry phase with ISO members.
Will replace ISO 7404-4:2017

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
     : Under development
    Stage
    : DIS registered [40.00]
  • Edition
     : 3
    Number of pages
     : 9
  • Technical Committee :
    ISO/TC 27/SC 5
    ICS :
    73.040 
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