90.92 Standard to be revised May 20, 2023
ISO
ISO/TC 27/SC 5 Methods of analysis
International Standard
73.040 Coals
Published
ISO 7404-2:2009 specifies methods for preparing a polished particulate block from a sample of crushed coal for analysis by reflectance microscopy. These methods can also be applied to the preparation of a polished, embedded lump of coal.
WITHDRAWN
ISO 7404-2:1985
PUBLISHED
ISO 7404-2:2009
90.92
Standard to be revised
May 20, 2023