ISO 16664:201描述了可能影响用于校准目的的纯气体和均匀气体混合物的组成的因素。本文件仅适用于“利用期”内的气体或气体混合物。它为校准气体混合物的处理和使用提供了以下准则: - 校准气瓶的储存; - 校准气体从气瓶中取出; - 校准气体从气瓶传递到校准点。 它还概述了一种评估气体混合物的稳定性的方法，同时考虑到证书上给出的气体组成不确定度和用户的测量不确定度。

ISO 16664:2017 describes factors that may influence the composition of pure gases and homogeneous gas mixtures used for calibration purposes. This document only applies to gases or gas mixtures that are within the "utilization period". It provides the following guidelines for the handling and use of calibration gas mixtures: - storage of calibration gas cylinders; - calibration gas withdrawal from cylinders; - transfer of calibration gas from cylinders to the point of calibration. It also outlines a method of assessing the stability of a gas mixture, taking into account the gas composition uncertainty given on the certificate and the user's measurement uncertainty.