Commutability evaluation of reference materials of composition and properties of substances and materials

The International Organization for Standardization laid down modern requirements for reference material producers (ISO 17034:2016), testing and calibration laboratories (ISO 15025:2005), stipulating the evaluation of reference material commutability in the course of their development (ISO Guide 35:2006) and use (ISO Guide 33:2006). The article deals with general issues of reference material commutability evaluation, the cases when the commutability evaluation is useful and the description of the approach, which may be used in the processing measurement results when evaluating the commutability of reference materials.