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Why Water Vapor Permeability is Critical for OLED and how to measure it

OLED is extremely sensitivity to water vapor, even microscopic amounts of moisture can lead to rapid degradation, causing unsightly dark spots, short circuits, and significantly shortening the display's lifespan. This is why the OLED Display Water Vapor Transmission Rate Test is so important.

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Why Water Vapor Permeability is Critical for OLED and how to measure it

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  1. Labthink Instruments • July 2025 • Why Water Vapor Permeability is Critical for OLED  • And How to Measure it

  2. Water Vapor Permeability is Critical for OLED • Water vapor ingress causes metal electrodes to oxidize and organic layers to degrade, leading to critical issues like dark spots and short circuits. • To achieve an OLED device lifespan of at least 10,000 hours, the industry recognizes a critical WVTR target of 1 x 10⁻⁶ g/(m²·day). 

  3. How to measure the WVTR for OLED • Specialized instruments like Labthink C330H Water Vapor Transmission Rate Test System is developed. • The instrument creates a humidity difference between the material being tested. • Water vapor permeates through the test material from the high-humidity side to the low-humidity side. • A dry carrier gas carries the permeated water vapor to an electrolytic sensor, which converts it into an electrical current for direct WVTR calculation. • LEARN MORE

  4. Page 05 • Labthink C330 Water Vapor Transmission Rate Test System • Features • Electrolytic sensor  • Higher sensitivity • Advanced hydrodynamic and thermodynamic design • Automatically control of temperature and humidity  • Standards • Applications • Parameters • ISO 15106-3, ASTM F3299 • Films. sheeting, packages • Test Range: 0.005 ~ 50 g/(100in2·day) • Resolution: 0.001 g/(100in2·day) • Temperature & Humidity: 10 ~ 55 ±0.2°C; 5% ~ 90% ±1%, 100% RH 

  5. About Us • Labthink is a multinational technology company that is devoted to helping customers succeed, employees grow and brands gain respect. As the demand for functional packaging materials grows, testing methods are evolving to ensure a more comprehensive evaluation of packaging films. Labthink encourages collaboration with packaging industry companies for quality control! 

  6. Labthink Test Solutions • C690H & C690M Nondestructive Package Leak Detector • C840H & C840M Integrated Evaporation Residue Testing System • Tensile, Thickness,  & • Friction Testers

  7. Contact us • +86-531-85068566 • trade.en@labthink.com • www.labthink.com • @ • @labthinkchina • 144 Wuyingshan Road, Jinan, P.R.China

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