Skip to main content

Water Vapor Transmission Rate

Water vapor transmission rate, or WVTR, measures how much water vapor passes through a film, coating, package, or material over time. Lower WVTR values indicate stronger moisture barrier performance.

See related terms:  
Barrier Coatings 
Ethylene Vinyl-Alcohol Copolymers (EVOH) 
Hydrophobicity 
Oxygen Transmission Rate 
Sorption 

Barrier-film diagram showing water vapor movement through layers.

Back to Glossary

Request more information about Kuraray’s products or services

Contact Us