1.1本试验方法包括在规定的暴露条件下测定柔性热封包装的水蒸气传输量。 注1:在本试验方法之前，应确定足够的热封效率。 1.2 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 该测试方法确定了包装的水蒸气阻隔性能。通过适当的预防措施和背景经验，可以获得可重复的结果，以帮助选择提供所需产品保质期的适当包装材料。本试验方法可用于制定性能规范。

1.1 This test method covers the determination of the amount of water vapor transmission for flexible heat-sealed packages under specified conditions of exposure. Note 1—Adequate heat-seal efficiency should be determined prior to this test method. 1.2 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== This test method determines the water vapor barrier properties of the package. With proper precautions and background experience, reproducible results can be obtained to aid in the selection of proper package materials required to provide the product shelf-life desired. This test method may be used to establish a performance specification.