With the development and usage of the renewable energy., along with the advocation and encourage of National policy, Solar backsheet,as a relatively mature cleaning energy, has been more and more used in industrial production and daily life. Solar modules are sequently laminated by solar PV glass, EVA, solar cells and solar backsheet. As the most outermost protective layer of the solar cell module, solar battery backsheet plays an important protecting and supporting role to battery piece and to be an important component of solar cell module. The service life of solar cell products is generally long.In order to meet the requirement, the backsheet material must not only have good weather resistance, shock resistance and reliable insulativity, but also have the higher water barrier performance. If the solar backsheet had the bad water barrier performance, then the humidity in air((especially rainy days more moisture) will pass through solar backsheet to inner side, and will affect the bonding properties of EVA and result in the backsheet separating from EVA, and more moisture vapor directly contact with solar cells and make the cell oxidation, thus affecting the battery life. So the barrier performance is an important indicator to measure the performance of solar cell backsheet.It mainly reflected in the water vapor transmission rate data. The smaller the water transmission rate, the better the water resistance.

Next, We will have some simple introduction to solar backsheet 's water vapor permeation test combined with Labthink PERMETM W3/330 Water vapor transmission rate tester

Water vapor transmission rate is the quality of water through the unit area in unit time,which is determined by the material's barrier properties and the water vapor concentration of the material. Currently, Japan's Sharp, Kyocera all have clear requirement to backssheet's water vapor transmission rate indicator. Germany, Austria and other countries have the clear standard. Nowadays, most clients in the industry had generally adopt water vapor transmission rate testing principle of electrolysis method because its high-accuracy and good reliability.

Labthink's R&D production W3/330 Water vapor transmission rate tester
,adopting electrolysis test principle, structure design and excellent selection of components to make equipment with higher testing accuracy. and the control ability of temperature and humidity of environment is much higher than standard requirement, and provide a convenient and rapid calibration method as well. By the Patent cavity structure design, the instrument can complete three kinds of same or different specimens test simultaneously, while using the host machine and satellite machine mode, a host can connect 9 satellite. which can achieve a maximum of 30 samples simultaneously to satisfy the testing demand for large laboratory test. And its application range is wide, which is suitable for water vapor transmission rate testing for plastic film. composite membrane, sheet material, high barrier materials, backplane, metal foil, waterproofing membrane, fabric, rubber, building materials,the carton cardboard and solar backsheet

While ensure the index of water vapor transmission rate of solar backsheet is standard, we must have control other indicators such as tensile strength and peel strength to ensure the quality of the products.About more information of the testing instrument, please see more details at http://www.labthink.cnLabthink
hopes to have further cooperation with the enterprises in all industry.