It is based on the testing principle of an infrared moisture sensor. The pre-treated sample is clamped between the test chambers. Nitrogen with a stable relative humidity flows on one side of the film, and dry nitrogen flows on the other side of the film. Due to the presence of a humidity difference, water vapor will diffuse through the film from the high-humidity side to the low-humidity side.

Based on the testing principle of the infrared moisture sensor, it provides high-precision and high-efficiency water vapor transmission rate testing for materials with high and medium gas barrier properties. It is suitable for the water vapor transmission rate testing of various film materials such as plastic films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foil composite films, glass fiber aluminum foil paper composite films, etc. in fields such as food, pharmaceuticals, medical devices, daily chemicals, photovoltaics, electronics, etc. It is also applicable to the water vapor transmission rate testing of sheet materials such as PP sheets, PVC sheets, PVDC sheets, metal foils, rubber sheets, silicon wafers, and the water vapor transmission performance testing of related materials.

Single-chamber WVTR Tester：The water vapor barrier tester is a precision instrument designed to measure the water vapor transmission rate (WVTR) of materials, based on the test principle of infrared method, evaluating their ability to block or allow moisture transfer. This water vapor permeation analyzer is critical for industries requiring strict control over moisture-sensitive products, such as food packaging, pharmaceuticals, electronics, and textiles.

Three-chamber WVTR Tester (infrared method).Water vapor transmission analyzer,based on the test principle of infrared moisture sensor, it provides high precision and high efficiency water vapor transmittance test for high and medium gas barrier materials.