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potato chips are usually packed in aluminized composite film. In this paper, Labthink FDT-02 Flex Durability tester and VAC-V2 Differential Pressure Gas Permeability Tester are used to test the change of oxygen permeability before and after the flex of aluminum composite film packaging of potato chips. The flex resistance of the potato chip bag has been evaluated. The basic process of the test and the test principle are also introduced. Continue reading

some components of medical packaging are prone to deterioration when encountering oxygen. Therefore, this packaging should have effective oxygen barrier performance. In this paper, Labthink’s VAC-V2 Differential Pressure Gas Permeability Tester is used to test the barrier performance of aluminum-plastic composite film samples for medical packaging in relation to oxygen transmission rate. The test process, test principle, equipment parameters, etc. are described in detail. This can be used as a reference for organizations selecting oxygen permeability test equipment and methods. Continue reading

The cup method used to measure the water vapor permeability of materials includes two methods: desiccant method and water method. In this paper, the two methods are used to measure the water vapor permeability of a foamed sponge sample. The test principle, procedure and results of the two methods are compared. The instrument specifications and applications are introduced, which provides a reference for the use of the cup method to test the moisture barrier performance of materials. Continue reading

Separation membranes selectively separate gases, and the separation coefficient of gases is a key performance index in measuring separation effect. In this paper, by testing the permeability of nitrogen and carbon dioxide to a certain membrane sample, the separation ability of the sample to nitrogen and carbon dioxide is evaluated. The test principle, the parameters, application of the pressure differential method testing equipment, and the test process are introduced. Reference for the analysis and test of the separation effect of the membrane is provided. Continue reading

With an increasing focus on energy efficient and sustainable building construction, the need to accurately define the heat-air-moisture transport (hygrothermal) properties of building materials cannot be overemphasized. New techniques are being developed for this purpose. The Modified Cup Method is one such technique to determine the water vapor transmission properties of building materials. This paper uses the C360M Water Vapor Transmission Rate (WVTR) Test System to test the WVTR of exterior wall coating. The paper also introduces the test principle, instrument specifications, application scope, and test procedure in hope to provide a reference for further studies on the water vapor permeability of building materials. Continue reading