ISO TC 334, specifically WG9, has recently transformed ISO Guide 33 into an international standard. 

This document describes good practice in using reference materials (RMs), and certified reference materials (CRMs) in particular, in measurement processes. These uses include:

• the assessment of precision and trueness of measurement methods;
• quality control;
• assigning values to materials;
• calibration;
• establishing conventional scales.

This document also relates key characteristics of various types of RMs to the different applications. Through a table, users of RMs can easily check which requirements need to be fulfilled by the material and indicated on the certificate. Furthermore, instructions on the handling, correct application of the certificate instructions, and reading of traceability statements are given.

 

The previous ISO Guide 33 had been published in 2015.

Paper citations:

Adriaan M. H. van der Veen., "Revision of ISO Guide 33: good practice in using reference materials". Accred Qual Assurance (2015) 20:529