Differences and performance comparison between fluorosilicone and fluororubber

Fluorosilicone rubber (FVMQ) and fluororubber (FKM, also known as fluorinated rubber or Viton) are both high-performance elastomeric materials widely used in extreme environments. They each have unique properties and application areas. The following is a detailed comparison of the differences and performance of the two materials.

Fluorosilicone rubber (FVMQ)

Features:

Chemical resistance: Fluorosilicone rubber is a fluorinated modified product of silicone rubber, which improves oil resistance and chemical resistance.

High and low temperature resistance: Maintains good performance in the temperature range of -60°C to 200°C.

UV resistance: Has good UV resistance and is suitable for outdoor and high UV radiation environments.

Biocompatibility: Has good biocompatibility and is suitable for medical devices.

Applications:

Automotive industry: Used for seals in engines and transmission systems.

Outdoor equipment: Such as solar tracking systems and outdoor sensors.

Medical equipment: Used for medical devices and instruments that require biocompatibility.

Fluororubber (FKM, Viton)

Features:

Chemical resistance: Fluororubber has excellent resistance to oil, fuel, chemicals and solvents.

High and low temperature resistance: Maintains good performance in the temperature range of -20°C to 200°C, and some models can be used at high temperatures of 250°C.

Aging resistance: Has excellent aging resistance and long service life.

Mechanical properties: Excellent performance under high dynamic stress and strong resistance to compression deformation.

Applications:

Automotive industry: Used for seals in engines, fuel systems and transmission systems.

Petrochemical: Used in equipment for handling strong acids, strong alkalis and other corrosive chemicals.

Aerospace: Used for aircraft engines and aircraft seals.

Performance comparison

Performance parameters Fluorosilicone rubber (FVMQ) Fluororubber (FKM, Viton)

Chemical resistance Good, especially oil resistance and chemical resistance Excellent, especially oil, fuel and solvent resistance

High and low temperature resistance -60°C to 200°C -20°C to 200°C, some models can reach 250°C

UV resistance Good, suitable for outdoor environments Fair, usually need to add UV stabilizer

Biocompatibility Good, suitable for medical devices Fair, not suitable for occasions with high biocompatibility requirements

Mechanical properties Good, good performance under high dynamic stress Excellent, excellent performance under high dynamic stress

Aging resistance Good, but not as good as fluororubber Excellent, long service life

Processing performance Good, suitable for various shapes and sizes Good, but some models with higher hardness are more difficult to process

Cost High High, usually more expensive than FVMQ

Conclusion

Both fluorosilicone rubber (FVMQ) and fluororubber (FKM, Viton) are high-performance elastomeric materials suitable for extreme environments. Their differences are mainly reflected in chemical resistance, high and low temperature resistance, UV resistance, biocompatibility and mechanical properties. Fluorosilicone rubber is slightly inferior to fluororubber in oil resistance and chemical resistance, but performs better in UV resistance and biocompatibility. Fluororubber performs extremely well in oil, fuel and solvent resistance and aging resistance. The selection of suitable materials should be determined according to the specific application environment and performance requirements. It is recommended to consult a professional seal manufacturer or supplier when selecting materials to ensure that the selected materials can meet the actual application requirements.

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