This document is intended to help reference material producers (RMPs) in preparing clear and concise documentation to accompany a reference material (RM). It lists and explains mandatory, recommended and other categories of information to be considered in the preparation of product information sheets and RM certificates. This information can be used by RM users and other stakeholders in confirming the suitability of an RM or certified reference material (CRM). This document also contains the minimum requirements for a label attached to the container of an individual RM unit.

• Year of Declaration: 2025
• Reference: ISO 33401:2024
• Number of Pages: 23
• Code: GYS 457
• Version: First Revision
• ICS Number: 71.040.30