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Rod seals are considered to be one of the decisive factor for the functioning of the hydraulic cylinder. Leakage through the rod seal can cause accidents / environmental damages. It is important to properly pair the rod seal & wiper for the best sealing performance. If a less aggressive rod seal is paired with an aggressive wiper, the wiper can scrape off the microscopically thin film of oil that remains on the rod in microscopic surface imperfections during the return stroke, resulting in system leakage. The thickness of the oil film depends upon the surface finish, rod seal and surface speed of cylinder.