5.1 Flexible barrier materials are universally used across industries and produced by a myriad of suppliers. They may be monolayer materials or complex composite structures. However, even with the diversity of material, there are still basic requirements that all flexible barrier materials should exhibit.

5.2 Flexible barrier material requirements may be divided into two categories, initial material qualification, and routine production and receipt requirements to ensure the purchaser receives exactly what is ordered. While all requirements may be included in the written specification, initial qualification tests may only be needed prior to the first order. Routine production and receipt requirements should be adhered to on every order. Initial qualification requirements are indicated with each clause, where applicable.

5.3 This guide provides an understanding of the requirements needed for the manufacture, purchase, and acceptance of flexible barrier materials. Appropriate test methods for compliance are also cited.

Note 1: All test methods for a particular requirement may not be cited due to specific or unique circumstances. For additional guidance on applicable methods, refer to Guide F2097.

5.4 The specification and its requirements should be mutually agreed to by the supplier and purchaser of the product. This helps ensure that the flexible barrier materials will comply with the specified requirements.