1.1 本规范涵盖微化学中广泛使用的容量瓶和四种类型的离心管。 注1: 下面列出的几个项目的规范是由美国化学学会分析化学部微化学仪器委员会制定的。 2. 1.2 当产品符合中列出的下一个较小体积标准产品的公差范围时，本标准中未列出的规定容量的产品可指定为a级公差 表1 . 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers volumetric flasks and four types of centrifuge tubes, widely used in microchemistry. Note 1: Specifications for several items listed below were developed by the Committee on Microchemical Apparatus, Division of Analytical Chemistry, American Chemical Society. 2 1.2 Product with a stated capacity not listed in this standard may be specified Class A tolerance when product conforms to the tolerance range of the next smaller volumetric standard product listed in Table 1 . 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.