This article is provided by Jinan Saicheng Electronic Technology***.
The air permeability of a film is closely related to its physical properties and microstructure. Due to the incomplete arrangement of the polymer chains, there are voids within the polymer through which the gas can pass through. Therefore, testing the air permeability of the film can help to understand the physical properties and microstructure of the film.
The air permeability of the film is related to the test temperature and humidity. In order to obtain accurate breathability data, tests need to be performed under constant temperature and humidity conditions. This helps to reduce trial errors and increase the reliability of the data.
Introduction to Thin Film Gas Permeability Tester
Based on the test principle of differential pressure method, the thin film gas permeability tester is a professional gas permeability tester for thin film samples, which is suitable for the determination of gas permeability and gas permeability coefficient of plastic films, composite films, high barrier materials, sheets, and metal foils at various temperatures.
Principle of thin film gas permeability tester
The instrument adopts the principle of differential pressure test, and the pre-treated specimen is placed between the upper and lower test chambers and clamped. First, the low-pressure chamber (lower chamber) is vacuumed, and then the entire system is evacuated; When the specified vacuum degree is reached, the lower chamber of the test is closed, and the high-pressure chamber (upper chamber) is filled with a certain pressure of test gas, and a constant pressure difference (adjustable) is ensured on both sides of the sample; In this way, the gas will penetrate from the high-pressure side to the low-pressure side under the action of the differential pressure gradient, and the internal pressure of the low-pressure side will be monitored and processed to obtain the various barrier parameters of the tested sample.
Technical parameters of thin film gas permeability tester
Test range 001 ~ 50,000 cm3/m2·24h·0.1MPa (regular).
The upper limit is not less than 60,000 cm3 m2·24h·01MPa (extended volume).
The number of specimens is 3 (the data are independent).
Vacuum resolution 005 pa
The vacuum of the test chamber < 10 pa
Temperature control range 10-60 °C
Temperature control accuracy 01°c
Specimen size 95 mm
Transparent area 3318 cm2
Test gases such as O2, N2, CO2 and so on (provided by the user).
Test pressure 01 mpa ~ 0.26 mpa
Connection size 6 mm polyurethane tubing.
Dimensions: 600 mm (L) 475 mm (W) 450 mm (H).
Power supply AC 220V 50Hz
Net weight 75 kg
Product configuration. Standard configuration: main unit, temperature control device, professional software, communication cable, micro printer, special sampler, vacuum grease, fast quantitative filter paper, vacuum pump.
Options: Sampling blade, vacuum pump oil, humidity generator.
Remarks: The air source inlet of this machine is 6mm polyurethane pipe; Gas source and distilled water users shall provide their own.