Four rubber materials commonly used in the sealing industry

Introduction

As a manufacturer of oil seals and hydraulic seals for many years, we are well aware of the importance of rubber materials to sealing products. The performance of rubber materials directly determines the reliability, durability and adaptability of seals. Today, let's share these four rubber materials.

1. Nitrile rubber

Nitrile rubber is a copolymer of acrylonitrile and butadiene, and has excellent oil resistance (mineral oil, fuel, etc.) and solvent resistance. It is easily corroded by heat, oxygen, ozone and strong chemicals, which limits its application in harsh environments. The standard operating temperature is -40°C to +100°C, and the elastomer properties are good, but the dynamic sealing performance is limited, which is more suitable for static or low-motion scenes.

However, it is not suitable for high temperature, strong oxidizing environment or high dynamic friction scenes (such as high-speed pumps and valves).

2. Fluororubber

It has a very strong carbon-fluorine bond and has excellent tolerance to chemicals, oils, fuels and strong oxidants (such as acids and alkalis). The standard operating temperature is -20°C to +250°C. It is highly elastic and wear-resistant, and is suitable for dynamic seals (such as rotating or reciprocating parts). It will absorb water and swell when exposed to steam, and harden and become brittle over a long period of time (similar to the aging of sponges). It is easy to break when disassembled. Avoid long-term contact with steam or hot water, which will cause expansion and hardening. It needs to be disassembled in pieces for maintenance. Low-temperature performance is average, and it may become brittle below -20°C.

3. EPDM rubber

Resistant to ozone, UV rays and extreme weather, suitable for long-term outdoor use. Operating temperature -40°C to +150°C, with higher high temperature stability after peroxide vulcanization. Performs well in hot water, steam and weak acid/alkali environments and is not easy to degrade. Remains flexible at low temperatures and resists permanent compression set. It will expand, soften and fail rapidly when in contact with hydrocarbons (such as oil and gasoline). It is strictly forbidden to use in oil and fuel environments, otherwise it will expand and deform severely, and residues will remain when disassembled. The dynamic sealing performance is average, and high mechanical stress scenarios need to be selected with caution.

4. Neoprene

Resistant to ozone, UV rays and extreme weather, suitable for long-term outdoor use. Tolerant to weak acids, alkalis and some solvents. Operating temperature -40°C to +120°C, weak tear and wear resistance, not suitable for high dynamic stress environments. Contact with oil or high temperature will swell, soften and accelerate aging. It is strictly forbidden to use it for oil and fuel or high-temperature dynamic seals (such as pumps, valves), otherwise it will adhere and fail. Insufficient wear resistance, avoid high friction or frequent movement scenes.

Conclusion

As a hydraulic seals manufacturer, we continuously optimize production processes and strictly control quality to ensure that each rubber material can perform at its best. We are committed to providing customers with high-quality, high-performance sealing products to meet their needs in various working conditions.