BS ISO 11760:2018,Classification of coals.The size of this pdf file is 2.07M.Now you can download it here.
BS ISO 11760:2018 describes a simple classification system for coals providing
—guidance on the selection of the appropriate ISO standard procedures for the analyses and testing of coals,
—international comparison of coals in terms of some key characteristics,
—descriptive categorization of coals.
The system is applicable to coals of all ranks, but care is required in relation to the classification of some types of coal.
2 Normative referen
ISO 1213-2, Solid minerafuels-Vocabulary-Part2 Terms relating to sampling, testing and analysis;
ISO 7404-1, Methods for the petrographic analysis of coals-Part 1: Vocabulary;
ISO7404-5, Methods for the petrographic analysis of -Part 5: Method of determining microscopically
the reflectance of vitrinite;
6 Descriptive classification terminology
The descriptive term used for each of the rank-dependent categories and sub-categories is accompanied by an alternative descriptive term (see Clause 4) that relates to the rank-dependent terms in use in existing ISO standards for the analysis and testing of coals.
Basing the classification system on three parameters (vitrinite reflectance, vitrinite content and yield ) with descriptive class sub-category terms for each of these, permits the use of a relatively sim descriptive classification of a particular coal sample. Some examples are shown in Table 7.