1. Material Composition The price of hydraulic cylinder oil seals is significantly affected by the materials used in their manufacturing. Common materials include nitrile rubber (NBR), polytetrafluoroethylene (PTFE), and polyurethane (PU). Each material has its unique properties, such as temperature resistance, chemical compatibility, and durability, influencing the overall cost. High-performance seals made from premium materials tend to be more expensive but can offer longer lifespans and better resistance to harsh conditions.
The designation 20x35x7 refers to the dimensions of the oil seal. The numbers represent the inner diameter (20 mm), outer diameter (35 mm), and the thickness (7 mm) of the seal. The design of an oil seal is critical, as it must fit precisely to ensure a proper seal and prevent the ingress of dirt, dust, or moisture. The choice of material used for these seals often includes rubber compounds that enhance flexibility and resilience. Common materials include nitrile rubber (NBR), fluorocarbon rubber (FKM), and silicone, each chosen based on the specific application and operating conditions.