May. 20, 2024
Choosing the best oil seal depends on several factors, including the application's requirements, the operating environment, and the specific properties needed from the seal material. Oil seals play a crucial role in preventing lubricant leakage and contaminants from entering machinery, thereby ensuring the longevity and efficiency of the equipment. Several types of oil seals are commonly used, each with its unique advantages.
Nitrile rubber oil seals, also known as Buna-N, are the most widely used elastomers for sealing. They offer excellent resistance to petroleum oils, mineral oils, greases, hydraulic fluids, and alcohol. They are commonly used in the automotive and aeronautical industries to make fuel and oil handling hoses, seals, and grommets. Nitrile rubber's resilience and stability at a wide range of temperatures make it an ideal choice for various applications.
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Viton® oil seals are known for their high-temperature and chemical resistance. They are particularly suitable for applications with exposure to aggressive chemicals and high temperatures. Viton® seals have low compression set characteristics and are used in chemical exposure situations and hard vacuum service. These properties make Viton® seals ideal for harsh environments where other materials might fail.
Silicone oil seals are highly resistant to various environmental conditions, making them suitable for the food and beverage, and medical/pharmaceutical industries. They have excellent heat resistance and flexibility at low temperatures, providing durability and endurance in specific applications.
EPDM oil seals are excellent for applications involving alcohol, water, and various environmental conditions. They are resistant to organic and inorganic acids, sodium and potassium alkalis, water, steam, and cleaning agents. EPDM's versatility makes it a reliable choice for various sealing needs.
HNBR (Hydrogenated Nitrile Butadiene Rubber) oil seals have superior resistance to petroleum oils and sour gas. They outperform standard nitrile in temperature range and abrasion resistance, making them suitable for demanding applications in the automotive and industrial sectors.
Hydrogenated nitrile butadiene rubber (HNBR) is produced by hydrogenation of NBR. Doing so removes the olefinic groups, which are vulnerable to degradation by various chemicals as well as ozone. Typically, Wilkinson's catalyst is used to promote the hydrogenation. The nitrile groups are unaffected. The degree of hydrogenation determines the kind of vulcanization that can be applied to the polymer. Trade names include Zhanber (Lianda Corporation), Therban (Arlanxeo), and Zetpol (Zeon Chemical). It is commonly used to manufacture O-rings for automotive air-conditioning systems. Other applications include timing belts, dampers, servo hoses, membranes, and seals.
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Teflon® oil seals are renowned for their toughness and chemical inertness. They provide outstanding chemical resistance and can be used in petroleum oils, fuels, solvents, and various environmental conditions. Teflon® seals are ideal for static and slow intermittent dynamic situations.
Polyacrylate oil seals offer higher heat resistance than nitrile and perform exceptionally well in high surface speed applications. They resist petroleum oils, fuels, and transmission fluids, making them a preferred choice in automotive and industrial applications where high temperatures are involved.
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