ASTM E398
Standard Test Method for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement
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About This Item
ASTM E398 is the ASTM standard for measuring the water vapor transmission rate of sheet materials using dynamic relative humidity measurement. It provides a controlled way to evaluate how much moisture passes through a sheet material under defined test conditions, which is important for product comparison, material selection, and quality assurance. For manufacturers, buyers, and laboratories, this standard helps support consistent testing and more reliable performance data for materials where moisture control matters.
ASTM E398 standard overview
The official title, Standard Test Method for Water Vapor Transmission Rate of Sheet Materials Using Dynamic Relative Humidity Measurement, shows that this standard is focused on a test method for sheet materials and moisture transmission behavior. ASTM E398 is used to assess how a material responds to differences in relative humidity, helping characterize vapor movement through a sample in a repeatable way. As a technical document, it is useful when a product page, specification, or test program needs a recognized reference for this type of measurement.
Where is ASTM E398 used?
ASTM E398 is commonly used in laboratory and quality control settings where sheet materials need moisture barrier evaluation. It may apply to films, laminates, coatings, papers, and other sheet-like products that are judged in terms of water vapor transmission. The standard is also relevant in procurement and product development workflows when teams need a consistent method for comparing candidate materials or verifying performance against a specified requirement.
Practical importance of ASTM E398
In practice, ASTM E398 helps reduce uncertainty in moisture transmission testing by giving users a defined method to follow. That supports more consistent results across testing programs, better communication between suppliers and customers, and clearer product evaluation during compliance review or material qualification. For organizations that rely on controlled vapor performance, the standard can improve confidence in test data and help identify materials that better meet performance expectations.
- Water vapor transmission rate testing
- Sheet material evaluation
- Dynamic relative humidity measurement
- Quality control and comparison testing
- Specification and procurement reference
- Publication Date: 2025-01-08
- Publisher: ASTM
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