What Materials Are Available for Oil Seals?

Number of hits：3892023-10-05 10:57:05　

　　Oil seals also known as shaft seals, are essential components in various types of machinery. They are primarily used to seal the openings between stationary and moving components in mechanical equipment. The materials used to manufacture oil seals vary based on the application and environmental conditions. Here are some of the most commonly used materials:

　　Nitrile (Buna): Nitrile is the most widely used elastomer in sealing. Nitrile oil seals have great resistance to petroleum oils and fuels, mineral oils and greases, hydraulic fluids, water, steam, and alcohol. They combine excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water, and alcohols.

　　Fluororubber (FKM): Fluororubber oil seals feature excellent resistance to petroleum products and solvents. They have good high temperature and low compression set characteristics. They are suited for use with wide chemical exposure situations and for hard vacuum service.

　　Silicone (VMQ): Silicone oil seals have a high lubricant absorption capacity. It minimizes wear and friction in some applications.

　　Polyacrylate: Polyacrylate has better heat resistance than Nitrile. It works well in high surface speed oil seals.

　　Polyurethane: Polyurethane is an excellent material with high abrasion resistance characteristics and high tensile strength. Polyurethane oil seals are used in high pressure hydraulic systems where highly stressed parts are subject to wear.

　　Fluorosilicone (FVMQ): This material combines the good high and low temperature stability of silicone with the fuel, oil, and solvent resistance of fluorocarbon.

　　Highly Saturated Nitrile (HSN, HNBR): Oil seals made from highly saturated nitrile have excellent resistance to petroleum oils and sour gas.

　　Polytetrafluoroethylene (PTFE): PTFE is a tough, chemically inert polymer possessing an incredible working range.

　　Understanding the differences between these materials is essential when selecting the right seal for your application. While all these materials serve the same general purpose of preventing leakage and contamination, their specific applications vary based on the nature of the machinery they are used in.