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According to the standards of enterprises themselves, the use of solar cells to maintain the best working condition of the use of life in general for more than 25 years, the use of the backing material must have anti ultraviolet, water resistance, climate and other characteristics, which is particularly important for water resistance. TPT and TPE are two kinds of international market more common solar cell back structure, TPT is commonly used in the three layer structure (PVF/PET/PVF), these structural packaging materials for solar cells, such as the substrate, the air humidity, oxygen including acid gas can not penetrate into the inside of the solar energy, to prevent the battery chip is oxidized or acidification.