What material are bearing seals made of?

1. Rubber seal

Nitrile rubber:

Nitrile rubber is a common sealing material, which is a rubber synthesized from acrylonitrile and butadiene. It has good resistance to most mineral oils and mineral oil-based greases, general fuels such as gasoline, diesel and light civil fuel oils, animal oils, vegetable oils and fats, hot water and other media.

Nitrile rubber seals also allow the bearings to operate without oil for short periods of time. The allowed operating temperature range is -40 to 100°C. Can withstand temperatures up to 120°C for short periods of time. But it is not suitable to operate at higher temperatures. If the bearing is operated at high temperature for a long time, the seal will harden, thereby weakening the sealing performance of the bearing.

Hydrogenated nitrile rubber
Hydrogenated nitrile rubber has more wear-resistant properties than nitrile rubber, so seals made of this material have a longer working life. In addition, hydrogenated nitrile rubber has greater resistance to heat, aging and hardening in hot oil or ozone. Hydrogenated nitrile rubber allows a higher working temperature of 150°C, which is much higher than the working temperature of nitrile rubber.

fluororubber

The main characteristics of fluorine rubber are high temperature resistance and chemical corrosion resistance, good anti-aging and anti-ozone properties, and very low air permeability. Even under very harsh working conditions, fluororubber still has excellent wear resistance. It can withstand operating temperatures of 200°C or below. Seals made of this material allow the bearings to operate without oil for short periods of time.
Viton also has excellent resistance to various media including oil and hydraulic fluids, fuels, lubricants, inorganic acids, aliphatic and aromatic hydrocarbons, etc. Fluorine rubber should not be used in the presence of compounds such as esters, ethers, ketones, certain amines and high-temperature anhydrous hydrogen fluoride. If seals made of fluororubber are exposed to open flames or high temperatures above 300°C, they will be harmful to health and the environment! Even after cooling, they are dangerous.

2. Dust cover is generally made of metal

Bearings with dust shields are suitable for applications in dry conditions and relatively clean working conditions. Dust caps are also suitable for applications requiring low friction, such as high rotational speeds or high temperatures.

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