Definition
Moisture Vapor Transmission Rate—how much water vapor passes through a material over time under set conditions.
Applications
- Shelf-life modeling
- Selecting moisture barriers for powders
- Validating package performance
Benefits
- Prevents caking and staling
- Guides material selection
- Supports predictive shelf-life testing
Industry Examples
- Medical: moisture control for desiccant-packed kits or sensitive reagents.
- Industrial: moisture barriers for corrosion-sensitive hardware shipped internationally.
- Electronics: critical performance metric for compliance with JEDEC J-STD-033 moisture control requirements.
FAQ
Q: Does MVTR vary with temperature?
A: Yes—higher temperature typically increases transmission.
Q: Is MVTR enough to pick a film?
A: No—consider seal integrity, OTR, and mechanical requirements too.