Effect of Temperature and Humidity on Water Vapor Transmission Rate of Packaging Materials

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According to different uses, materials barrier properties of oxygen, water vapor, nitrogen, carbon dioxide, air and other gases are tested and expressed by the transmittance of the corresponding gas. Temperature and humidity are two important test parameters in the test of barrier performance. The change of temperature and humidity will affect the internal structure of materials and the movement ability of gas molecules, especially for water vapor permeability test, humidity is the drive for water vapor permeation on both sides of the packaging materials. Therefore, different temperature and humidity conditions lead to different gas transmission rates in packaging materials. The study on how temperature and humidity affect material barrier performance can provide reference for packaging materials in different storage environments.

Test Specimen

The test specimens are Black & White Film for milk packaging; they are tested under conditions of 23℃、90%RH，38℃、70%RH and 38℃、90%RH for Water Vapor Transmission Rate.

Test Standards

Cup method, infrared sensor method, electrolytic sensor method and humidity sensor method are widely used for testing film Water Vapor Transmission Rate. The test described in this article used cup method which conforms to ASTM E96, Standard Test Methods for Water Vapor Transmission of Materials

Testing Instrument

The testing instrument is C360M Water Vapor Transmission Rate Test System manufactured by Labthink Instruments Co., Ltd.

Cup method also known as gravimetric method, it refers to the method used to test a specimen Water Vapor Transmission Rate by measuring the weight change of the test dish over time. Cup method is subdivided into dry cup method and wet cup method. Seal the test dish with