The materials used to make hydraulic seals vary depending on the needs of the particular application, the operating environment, and the material’s compatibility with hydraulic fluids. Typical hydraulic sealing materials include the following:
1，Polytetrafluoroethylene (PTFE) is a fluoropolymer that has a low coefficient of friction and exceptional chemical resistance. It is frequently utilized in hydraulic seals as a backup ring material to increase sealing effectiveness or as a part of composite seals.
2，Nitrile (NBR) rubber: Because of its superior resistance to hydraulic fluids, oils, and fuels, nitrile rubber is frequently used for hydraulic seals. Flexibility, abrasion resistance, and sealing performance are all good over a wide temperature range. Hydraulic applications that are general-purpose can benefit from nitrile seals.
3，Polyurethane (PU): This adaptable material is utilized in hydraulic seals. It provides exceptional resistance to hydraulic fluids, high strength, and good wear resistance. High pressure can be tolerated by polyurethane seals, which are frequently employed in dynamic sealing applications.
4，Fluoroelastomers (FKM): Viton® and other fluoroelastomer seals are remarkably resistant to chemicals, high temperatures, and hydraulic fluids. They are frequently employed in sealing-related applications involving aggressive fluids or harsh environments.
5，HNBR (Hydrogenated Nitrile Butadiene Rubber)：Hydrogenated Nitrile Butadiene Rubber, or HNBR, is a synthetic rubber that outperforms ordinary nitrile rubber in terms of temperature and chemical resistance. It works well in hydraulic applications where increased resistance to heat, oil, and abrasive fluids is needed.
6，Rubber made of ethylene propylene diene monomer (EPDM) resists weathering, steam, and water well. It is frequently utilized in hydraulic seals for applications where water-based hydraulic fluids or outdoor conditions are present.
7，Silicone (VMQ): Silicone rubber has low compression set characteristics and is well-suited to withstand high temperatures. It is frequently utilized in hydraulic seals for high-temperature-resistant applications.
A number of variables, including fluid compatibility, temperature range, pressure, speed, and application-specific requirements, must be taken into consideration when choosing the right sealing material. For each hydraulic sealing application, manufacturers and suppliers of seals can offer advice on which material is best.
