Water vapor permeability is a key performance indicator for the water barrier properties of packaging materials like films and sheets. It reflects the amount of water vapor that can permeate a material of specific thickness under controlled conditions of temperature and relative humidity.
The gravimetric method, introduced in the mid-19th century, is the foundation for WVP testing. It directly measures the weight change of a desiccant exposed to water vapor transmitted through the test specimen. This method is enshrined in ASTM E 96, the first water vapor permeability testing standard established in 1953.
Modern gravimetric instruments combine the testing environment and weighing into a single unit, enhancing accuracy and simplifying operation. Advancements in weighing technology further improve test efficiency and precision.
.jpg)
Labthink C360H Water Vapor Transmission Rate Test System is developed based on the gravimetric determination method and conforms to ASTM E96.
Sensor methods encompass various technologies like relative humidity, infrared, and electrolytic sensors. These methods offer faster testing compared to the gravimetric method and can potentially simulate real-world packaging conditions.
Labthink C303H Water Vapor Transmission Rate Test System utilizes infrared water vapor sensor, it is developed according to ASTM F1249 and ISO 15106-2.
With multiple water vapor permeability testing methods available, gravimetric method stands out as the most widely used and reliable one. Its ability to function independently, combined with its scientific basis and demonstrably high repeatability, makes it the undisputed arbitration method for water vapor permeability disputes.
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! Visit the website www.labthink.com to learn more!
No comments:
Post a Comment