
How well does your packaging protect against moisture?
Moisture vapor transmission rate (MVTR) measures the amount of water vapor that passes through a packaging system over time. For moisture-sensitive pharmaceuticals, excess moisture can affect product quality and stability.
USP <671> testing evaluates packaging moisture protection and supports applicable container classifications.

Testing for Your Packaging System
PCL offers USP <671> testing for:
- Bottles and multiple-unit containers
- High- and low-barrier blister packs
- Plastic container systems
- Unit-dose packaging
- Liquid oral containers, evaluated for moisture loss
The appropriate method depends on your packaging format and the evaluation needed.
Frequently Asked Questions
How is MVTR measured?
PCL uses a calibrated analytical scale and validated calculators. Measurements and calculations depend on the selected method.
How long does testing take?
Test durations range from a few days to several weeks, depending on the method and packaging barrier properties.
What information should I include in my inquiry?
Share your packaging type, project goals, and desired timeline. If you’re unsure where to begin, describe your project in the form below.
Let’s Talk About Your Packaging
PDA Universe - Pharmaceutical Testing Inquiry
Complete the form below and one of our packaging experts will reach out to for more information!