What material is the bearing seal made of?

Nitrile-butadiene rubber is a general sealing material. It is a rubber synthesized from acrylonitrile and butadiene. It has good resistance to the following media.

Most mineral oils and mineral-based greases

General fuels, such as gasoline, diesel and light civil fuels

Animal Oil, Vegetable Oil and Fat

Hot water

NBR seals also allow bearings to operate for a short time without oil. The allowable operating temperature ranges from - 40 to 100 C. Within a short period of time, it can withstand temperatures up to 120 degrees Celsius. However, it is not suitable to operate at higher temperatures because NBR will harden.

Hydrogenated nitrile-butadiene rubber

Hydrogenated nitrile-butadiene rubber has more wear resistance than nitrile-butadiene rubber, so the seals made of this material have longer working life. In addition, hydrogenated nitrile-butadiene rubber has stronger heat resistance, aging resistance and hardening resistance in hot oil or ozone. The maximum allowable working temperature of hydrogenated nitrile-butadiene rubber is 150 C, which is much higher than that of nitrile-butadiene rubber.

Fluororubber

Fluororubber is characterized by high temperature resistance and chemical corrosion resistance, good anti-aging and ozone resistance, and very low permeability. Fluororubber has excellent wear resistance even under very bad working conditions. It can withstand working temperature of 200 C or below. Seals made of this material allow bearings to run for a short time without oil.

Fluororubber also has excellent resistance to various media, including oil and hydraulic oil, fuel oil, lubricants, inorganic acids, aliphatic hydrocarbons and aromatic hydrocarbons. Fluororubber should not be used in the presence of esters, ethers, ketones, certain amines and high temperature anhydrous hydrogen fluoride. If the seals made of fluororubber are exposed to open fire or high temperature above 300 C, they will endanger health and environment. Even after cooling, they are dangerous.

Seals are very important for lubricant cleaning and bearing life.

Seals are designed to prevent the loss of lubricants and the entry of contaminants into the space that needs to be protected.

Seals have the following characteristics:

has enough deformation capacity to compensate for irregular surfaces

has enough strength to withstand the pressure of work

can withstand a wide range of working temperature

Chemical resistance

Running time has minimum friction, friction heat and wear

What material is the bearing seal made of?

    Bearings with dustproof caps or seals on both sides are filled with grease and generally need no maintenance.

 

Bearing with dust cover is suitable for dry and relatively clean working conditions. Dust cover is also suitable for applications requiring low friction, such as high speed or high temperature.

Dust-proof cover is usually made of metal.

What material is the bearing seal made of?

    Bearings with contact seals are suitable for general contamination, applications where moisture or moisture is present, or require long service life and long-term maintenance-free conditions. The seals are generally made of rubber.