1.1 本规程涵盖从大量含有单宁的植物材料中获取代表性样品。 1.2 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本规程提供了获取各种材料代表性样品的标准程序，这些材料用作制革工业的鞣质来源。 5.2 描述了从一批或一批材料的部分中获取经济方便数量的代表性样品进行检查和分析的程序，以便就一批材料不同部分的质量变化程度和整个批次材料的平均质量达成一致。 5.3 任何抽样指示，无论多么明确，都不能取代实际参与抽样或监督抽样的人员的判断、技能和以往经验。这些指示旨在补充这种经验，尤其是作为选择两个或多个缔约方共同使用的方法的指南。 5.4 鞣制材料含有不同数量的水分，这取决于材料的性质和气候条件，因此必须尽快进行采样，以确保彻底性，以避免水分含量的变化。

1.1 This practice covers obtaining representative samples from shipment lots of botanical materials containing tannin. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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. ====== Significance And Use ====== 5.1 This practice provides standard procedures for obtaining representative samples of various materials used as a source of tannins for the tanning industry. 5.2 Procedures are described for obtaining representative samples of economical and convenient quantities from a lot, or sections of a lot, of material for examination and analysis so that agreement may be reached with regard to the extent of variation of quality in different portions of a lot and the average quality of the entire lot of material. 5.3 No directions for sampling, however explicit, can take the place of judgment, skill, and previous experience on the part of persons actually engaged in the sampling or the supervision of the sampling. These directions are intended to supplement that experience and, particularly, to serve as a guide in the selection of the method which is to be used, in common, by each of two or more contracting parties. 5.4 Tanning materials contain moisture in varying amounts, depending both on the nature of the material and on the climatic conditions, so that sampling must be carried out as quickly as is consistent with thoroughness in order to avoid changes in moisture content.