AT491 Plastic Film Water Vapor Permeability Tester

AT491 Water Vapor Permeability Tester is used to determine the water vapor permeability of plastic film or sheet by mass-reducing method. 

The specific amount of distilled water is placed in the test dish and test specimen is mounted on the test dish, so the test cavity is separated to two parts. On conditions of a specified temperature and humidity difference between two parts, water vapor passes through test specimen from the lower part into the upper part and absorbed by the desiccant. The mass loss of distilled water in test dish is weighed to calculate the water vapor permeability of the test specimen. 

★ Large colorful touch screen, setting of parameters and displays of test curve and report;

★ Automatic control, automatic test, automatic judge and automatic stop, simple operation and reliable result;

★ Real-time curve display of temperature, humidity, water vapor concentration and permeated amount;  

★ High-technology electromagnetic programmable step-by-step temperature controlling, automatic heating and cooling, no need of external temperature-controlling device;

★ Single test cavity with rapid testing rate;

★ High-precision sensor, continuous weighing and data acquisition;