Abstract: USP General Chapter 671 Containers–Performance Testing was revised recently, and this
Stimuli article explains how and why the revisions to 671 were made. The new method in the
proposed revision to 671 provides a test for determining the moisture vapor transmission rate (MVTR)
of the container-closure system. This test is capable of differentiating among high moisture barrier
container-closure systems and is more relevant to the needs of the pharmaceutical industry than the
original method described in the current 671 . This new method is both reliable and reproducible. The
test conditions used.

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