1.1 本规程涵盖了测试细胞的构建，该测试细胞可用于通过合适的提取液体（包括食品和食品模拟溶剂）从柔性屏障材料中提取成分。 1.2 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 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）。本标准的使用者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。 ====意义和用途====== 5.1 从柔性屏障材料中提取的知识可以用于许多有用的目的。如本实践中所述构建的测试池可以用于获得这样的数据。已经发现另一个测试单元与本实践中描述的测试单元等效。有关备用单元格的来源，请参见附录。 5.2 美国联邦法规21CFR 176.170（d）（3）、21CFR 177.1330（e）（4）、21CFR177.1360（b）、21FR177.1670（b）和21CFR附录VI（b）引用本标准实践作为确定与食品接触的包装或多层膜或改性纸表面可提取物含量的依据。在某些情况下，这是为此目的定义的唯一做法。在进行提取的规定中没有给出其他细节。 5.3 试验方法 D4754年 不等同于此测试方法。它用于双面提取在膜的两个暴露表面上具有相同材料的膜。

1.1 This practice covers the construction of test cells which may be used for the extraction of components from flexible barrier materials by suitable extracting liquids, including foods and food simulating solvents. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that 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 Knowledge of extractives from flexible barrier materials may serve many useful purposes. A test cell constructed as described in this practice may be used for obtaining such data. Another test cell has been found equivalent to the one described in this practice. See the appendix for the source of the alternate cell. 5.2 United States Federal Regulations 21CFR 176.170 (d)(3), 21CFR 177.1330 (e)(4), 21CFR 177.1360 (b), 21CFR 177.1670 (b), and 21CFR Appendix VI (b) cite this standard practice as the basis for determining the amount of extractables from the surface of a package or multilayer film or modified paper in contact with food. In some cases, it is the only practice defined for this purpose. No alternative detail is given in the regulations for conducting extractions. 5.3 Test Method D4754 is not an equivalent to this test method. It is for two-sided extraction of films having the same material on both of the exposed surfaces of the film.