Hydraulic cylinder seals play a crucial role in the functioning of hydraulic systems. They serve two primary purposes to retain hydraulic fluid within the cylinder and to prevent contaminants from entering the hydraulic system. Common types of seals include piston seals, rod seals, and wipers. Each type is designed to withstand specific pressures, temperatures, and fluid characteristics. Failure of these seals can result from several factors, including wear from friction, chemical degradation due to exposure to harsh fluids, and environmental factors such as dirt and moisture.