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Overview ISO 7404-5:2025 - "Coal - Methods for petrographic analysis - Part 5: Method of determining microscopically the reflectance of vitrinite" specifies a microscope-based procedure to measure vi…
Overview ISO 7404-5:2009 - Methods for the petrographic analysis of coals - Part 5 specifies the microscopic method for determining vitrinite reflectance. Measurements are made on well‑polished coal…
1 Scope This part of ISO 7404 specifies the methods for determining the reflectance of vitrinite of coals microscopically on the polished surfaces, immersed in oil. The methods are applicable to coal…