Georgia Gu - Water Vapor Transmission Rate (WVTR) Measurements

Session 20: Next Gen Advancements

Water Vapor Transmission Rate (WVTR) Measurements for Ultra-High Barrier Materials used in the Display Industry
Thursday, February 15, 2018
3:05 PM - 3:25 PM

Ultra-high barrier materials have been developed to protect OLED electronics and flexible displays from ambient moisture. These barriers have very low water permeation rates, and require quantitative measurements of WVTR levels down to 10-5 to 10-6 g/(m^2day). This paper will present the use of an absolute Coulometric Sensor to quantitatively measure WVTR directly down to a level of 10-5 g/(m^2day), and with a special setup, measure WVTR indirectly down to a level of 10-6 g/(m^2day). A comparison of WVTR results using this absolute Coulometric Sensor compared to the gravimetric method showed that results were quantitively similar; however, the gravimetric method test took months to complete, whereas the absolute coulometric method obtained comparable results in days. High barrier film samples also can be tested under highly accelerated life testing conditions at 85C and 85%RH using this coulometric method and a custom-designed test fixture. Details of this design will also be presented.

Speaker's Biography

Georgia Gu is a Senior Global Application Specialist for AMETEK MOCON. Prior to this position, Georgia had worked at MOCON for over 20 years as Senior Scientist and International Application Specialist. Georgia holds BS and MS degrees in Chemistry from Fudan University, Shanghai, China, and also holds a M.S. degree in Packaging Science from Michigan State University. Georgia is an active member of ASTM, IoPP, and TAPPI Associations.


Georgia Gu
Sr. Global Applications Specialist