Rubber seals play a vital role in many applications, their main function is to prevent leaks, isolate the external environment and protect internal components. According to the different needs of the application, rubber seals can be made of different materials. This article will compare common rubber seal materials to help you choose the most suitable material.
1.Nitrile butadiene rubber (NBR)
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Oil resistance: Nitrile butadiene rubber has excellent oil resistance and wear resistance, suitable for contact with petroleum-based liquids.
Temperature range: Usually used in the temperature range of -30°C to +100°C.
Chemical resistance: poor tolerance to some chemicals and liquids, not suitable for strong acid and alkali environments.
Application scenario
It is suitable for automobile, mechanical equipment, oil delivery system and other occasions that need to contact with oil or fuel.
2. Fluorine Rubber (FKM)
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High temperature resistance: Fluorine rubber has excellent high temperature resistance and can usually be used in the temperature range of -20°C to +200°C.
Chemical resistance: Excellent resistance to a variety of chemicals, including acids, bases and solvents.
Oil resistance: The oil resistance of fluorine rubber is better than that of nitrile rubber.
Application scenario
Commonly used in aerospace, chemical equipment, high temperature industry and other fields.
3. Silicone (SI)
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Extreme temperature resistance: Silicone has a wide temperature range, usually from -60°C to +250°C.
Biocompatibility: Excellent biocompatibility, suitable for medical equipment.
Chemical stability: Good tolerance to most chemicals, but not suitable for strong acid and alkali environments.
Application scenario
It is mainly used in medical equipment, food processing, electronic equipment and other applications with high requirements for temperature and biocompatibility.
4. Polyurethane (PU)
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Wear resistance: Polyurethane has excellent wear resistance and tear resistance.
Oil and chemical resistance: Better than nitrile rubber in oil and chemical resistance.
Temperature range: Generally used in the temperature range of -30°C to +80°C.
Application scenario
Suitable for environments requiring wear and chemical resistance, such as hydraulic systems, industrial machinery and tires.
5. Ethylene Propylene rubber (EPDM)
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Weather resistance: ethylene propylene rubber has excellent weather resistance and UV resistance.
Chemical resistance: Good resistance to acids, alkalis and water, but poor oil resistance.
Temperature range: Usually used in the temperature range of -40°C to +120°C.
Application scenario
Suitable for applications with high environmental tolerance requirements such as automotive seals, construction industry and horticultural products.
6. Butyl rubber (IIR)
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Air tightness: butyl rubber has excellent gas sealing performance.
Chemical resistance: Good tolerance to acids and alkalis, but poor tolerance to solvents and oils.
Temperature range: Generally used in the temperature range of -40°C to +100°C.
Application scenario
It is mainly used in medical fields, gas sealing and isolation applications where excellent air tightness is required.
7. Low elastic rubber
Features:
Low elongation and low hardness: This type of rubber has small deformation and relatively low hardness when stressed, which makes it better able to adapt to irregular surfaces and improve the sealing effect.
Good shock absorption ability: low elastic rubber can effectively reduce vibration and noise, improve the smooth operation of equipment.
Temperature and chemical resistance: Specific properties depend on the specific type and formulation of rubber.
Application scenario:
Suitable for applications where shock absorption, noise reduction and sealing on irregular surfaces are required.
Sum up
Rubber seals of different materials have different characteristics and application ranges. Choosing the right material depends on the specific environment and needs, such as temperature range, chemical resistance, wear resistance, etc. The working conditions of the sealing ring should be considered in the selection to ensure that the performance of the material matches the needs of the actual application. This will help extend the service life of the seals and improve the overall performance and reliability of the equipment.