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Our company treats the polyester felt, polypropylene felt, anti-static felt, and Aramid felt with the active fluoride. Each type of felt has obtained the ideal water and oil repellent effect. Not only the result achieves the national standard, but also the original appearances are all well kept. After treatment, those filter material can form the molecular barrier around the fiber, which may prevent water, dirt attaching and leaking. Compared with the common filter material, it has the water and oil repellent characteristics; moreover, it has the anti-cohesiveness and easiness for cake peeling off. This product is especially suitable for southern moist and rainy environments.