Exploring the physical properties of NBR seals: the key to industrial sealing solutions

In the industrial field, the performance of seals is directly related to the reliability and safety of equipment. NBR (nitrile rubber), as a widely used synthetic rubber, is widely used in the manufacture of seals due to its excellent oil resistance and chemical resistance. This article will explore the basic physical quantities of NBR seals in depth and reveal its key role in industrial sealing solutions.

1. Oil resistance of NBR seals

NBR is known for its excellent oil resistance, which makes it an ideal choice for seals in hydraulic systems and lubricating oil systems. Oil resistance is one of the basic physical quantities of NBR seals, which determines the stability and durability of seals in oil media.

2. Chemical resistance and media compatibility

The chemical resistance of NBR seals is another major advantage. It can resist the erosion of a variety of chemicals, including certain acids, alkalis and solvents. Media compatibility is a physical quantity that must be considered when selecting NBR seals to ensure the performance of the seals in specific working environments.

3. Temperature Range and Thermal Stability

NBR seals are able to operate over a wide temperature range, typically between -40°C and +120°C. Temperature range and thermal stability are important physical quantities for evaluating the performance of seals at extreme temperatures.

4. Hardness and Elasticity

Hardness is an important indicator for measuring the ability of NBR seals to resist deformation. NBR has a wide hardness range and can be adjusted according to different application requirements. Elasticity is the ability of the seal to restore its shape after being subjected to force, which is essential for maintaining sealing performance.

5. Friction Coefficient and Wear Resistance

NBR seals have a low friction coefficient, which helps reduce energy loss and wear. Wear resistance is the ability of the seal to resist wear during long-term use, which directly affects the service life of the seal.

6. Compression Set and Restoration Force

Compression set is a measure of the ability of a seal to maintain its shape under continuous pressure. Restoration force is the ability of a seal to restore its original shape after the pressure is removed. These two physical quantities are essential to ensure that the seal can seal effectively for a long time.

7. Aging Resistance and Environmental Adaptability

The aging resistance of NBR seals enables them to maintain good performance after long-term use. Environmental adaptability involves the seal’s resistance to environmental factors such as humidity, ultraviolet light and ozone.

8. Material compatibility and selectivity

When designing a sealing system, the material compatibility of NBR seals is a key consideration. It needs to be compatible with other materials in the system to avoid chemical reactions or performance degradation.

Automobile transmission front axle seal FKM NBR 1

Let’s take a look at the basic physical quantities;

Pressure: The internal and external pressure difference that the sealing surface is subjected to affects the tightness and durability of the seal.
Temperature: The temperature range of the working environment has an important impact on the selection and performance of the sealing material.
Speed: The speed at which the seal moves, affecting friction and wear.
Medium: The type of fluid or gas that the seal needs to isolate, including its chemical properties and corrosiveness.
Environment: The environmental conditions in which the seal is located, such as humidity, pollution level, vibration, etc.
Size: The physical size of the seal, including diameter, width, thickness, etc.
Material: The material type of the seal. Different materials have different physical and chemical properties and are suitable for different working conditions.
Elastic modulus: The ability of the material to deform elastically when subjected to force, which affects the recovery force of the seal.
Hardness: The ability of the material to resist deformation. Materials with higher hardness are more stable under high pressure.
Coefficient of thermal expansion: The ratio of the volume change of the material when the temperature changes, which affects the performance of the seal at different temperatures.
Coefficient of friction: The friction between the seal and the contact surface, which affects energy consumption and wear.
Chemical resistance: The ability of the material to resist chemical corrosion, which is particularly important for sealing of specific media.
Aging resistance: The ability of the material to maintain performance after long-term use, which affects the service life of the seal.
Sealing force: The force applied to the seal to maintain sealing contact.
Leakage rate: The amount of medium leakage through the seal under specific conditions.
These physical quantities need to be comprehensively considered during seal design, selection and application to ensure the effectiveness and reliability of the sealing system.