Gas barrier performance is an important research field of thin film materials. According to different applications, gas barrier performance of thin film materials can be divided into barrier or preservation ability of oxygen, nitrogen, carbon dioxide, helium, water vapor, sulfur hexafluoride and other gases, due to the molecular diameter of gases, critical temperature, gas molecules and the different interaction between polymers in materials, the permeability of different materials to same gas is different, the permeability of the same materials to different gases is also different. Therefore, it is necessary to select suitable film materials according to the requirements of applications. For packaging materials, the primary task is to prevent oxidation of products. Nitrogen-filled packaging is an important measure to achieve this function. Therefore, the barrier performance of packaging materials to oxygen and nitrogen is important.

In order to test the gas permeability of three samples and improve the test efficiency, VAC-V2 differential pressure gas permeability tester with three independent chambers is used. The instrument is developed and produced by Jinan Labthink Instruments.

The oxygen transmission rate of PE, BOPP and PET were 1603.578 cm3/(m2•24h•0.1MPa)、625.068 cm3/(m2•24h•0.1MPa)、16.953 cm3/(m2•24h•0.1MPa) respectively, the nitrogen transmission rate of PE, BOPP and PET were 403.658 cm3/(m2•24h•0.1MPa)、120.697 cm3/(m2•24h•0.1MPa)、2.487 cm3/(m2•24h•0.1MPa)respectively.

In this paper, three kinds of samples and two kinds of gas permeability were tested by one test. The test efficiency and the cost performance ratio of the test instrument is high, and the test results are accurate. From the test results, the order of permeability to oxygen and nitrogen from high to low is PE, BOPP and PET, shows that PET samples have the highest barrier to gases, followed by BOPP and PE. In addition, the nitrogen permeability of all three samples is lower than their oxygen permeability, which is due to the larger size of nitrogen molecular diameter than oxygen molecular.

Labthink Instruments Co., Ltd, is dedicated to providing customers with packaging testing solutions and helping the manufacturers to reach their goals of quality and safety assurance through improvement of packaging testing techniques and development of high-end packaging testing instruments. With 30 years of experience in R&D, production and test, under the guidance of advanced sensor technology and design concept, Labthink developed a new generation of C-series barrier testing equipment. C- Series testing equipment adopts self-determination sensor technology, achieves a revolutionary upgrading in accuracy, efficiency and automation, and realized the paradigm shift of packaging barrier testing instruments. For more information please visit www.labthink.com