This part of ISO 7404 specifies the method for deter-mining microscopically the maximum and random reflectance in oil of polished surfaces of the vitrinite component of coals. The method is applicable to ei-ther coals from single seams or coal blends covering the whole range of bituminous coal and anthracite. By itself, this method is unsuitable for determining the proportion of components in a blend, particularly when the components have dissimilar measurable vitrinite contents.
The method necessitates the identification of vitrinite by the operator. Reflectance measurements on vitrinite obtained by interpreting the results of a com-puterized automated system of microscopic analysis are outside the scope of this part of ISO 7404.
BS 6127-5:1995 history
2009BS ISO 7404-5:2009 Methods for the petrographic analysis of coals - Method of determining microscopically the reflectance of vitrinite
1995BS 6127-5:1995 Petrographic analysis of bituminous coal and anthracite - Method of determining microscopically the reflectance of vitrinite