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    High durability elastomers for harsh and demanding applications.

Momentive fluorosilicone elastomers are an excellent choice for applications that require chemical, fuel, or solvent resistance under a wide range of temperatures. They are also unaffected by ozone, UV and gamma radiation, and harsh weather conditions like rain, frost, and snow.

Why Momentive fluorosilicones?

• Excellent resistance in automotive fluids like engine and hydraulic oils, fuels, and various mixtures
• High thermal stability
• Lowest temperature flexibility of all fluoroelastomers
• Constant modulus over a wide temperature range
• Low hardness without the addition of plasticizers
• Good tear strength
• Low compression set

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Momentive fluorosilicones applications:


Momentive fluorosilicones are the top choice for use in fuel systems. They offer a combination of high thermal stability up to +177°C (+350°F) and a superior resistance to petroleum fuels and hydrocarbon fluids. This makes them excellent for use in a wide array of applications such as:

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    Automotive Parts: Components such as seals, O-rings, quick-connect seals, gaskets, diaphragms, membranes, flexible valves, and turbocharger hose liners.
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    Aviation/Aerospace: Parts including gaskets, seals, hoses, bellows, and connectors.
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    Railway and Heavy Transportation: Parts including gaskets, seals, hoses, bellows, and connectors.
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    Petrochemical, Oil & Gas, and Industrial: Components such as sealing elements for pumps, valves, and pipelines exposed to liquid or gas hydrocarbons or corrosive chemicals.
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Types of fluorosilicones:

Over the last several years, the marketplace for molded silicone rubber parts has moved toward the use of liquid silicone rubber (LSR) due to its ease of processability, design versatility, excellent quality, and high productivity.

Liquid silicone rubbers offer intermediate fuel and solvent resistance; however, in very harsh environments, heat-cured fluorosilicones are still the material of choice due to their higher fluorine content, thermal stability, and superior solvent resistance. 
Fluorosilicone elastomers are primarily available in two primary forms:

  • FSE Heat-Cured Elastomers: They can be processed with conventional high consistency rubber processes, including injection molding, transfer or compression molding, extrusion, and calendering molding.

  • FSL Liquid Silicone Rubber: This range of products is excellent for use in conventional LSR injection molding applications.

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Momentive fluorosilicones offer superior resistance compared to traditional VMQ silicones:

  • Superior resistance compared to traditional silicones:

    VMQ silicones offer good flexibility, insulation, and heat resistance. However, fluorosilicones (FVMQ) have fluorinated side chains that provide superior resistance to oils, fuels, and hydrocarbon fluids.

Fluorosilicones (FVMQ) compared to VMQ silicones

  • Long-lasting in engine oils: 

    ??Momentive fluorosilicone elastomers remain almost unaffected and provide long-lasting performance in contact with mineral and synthetic engine oils.

Fluorosilicones (FVMQ) compared to VMQ silicones in contact with fuels

  • Low swelling in fuels: 

    Momentive fluorosilicones provide low volume swelling that makes them excellent for use in static and dynamic seals around fuel systems.

Swelling resistance of fluorosilicones compared to traditional silicones


  • Resistance against blow-by-gas condensates: 

    It is essential for membrane and diaphragm parts to have high resistance to blow-by-gas mixtures and combustion by-products.


Resistance of fluorosilicones against blow-by-gas condensates


  • Performance over a wide temperature range: 

    Momentive fluoroelastomers provide excellent properties and remain flexible for long periods when exposed to elevated temperatures. They also offer superior performance at temperatures as low as -55°C and are useful at a wide temperature range of -55 up to 200°C. Thermal conductivity of 0.25 W/m.K that also can be modified by compounding. (Coefficient of thermal expansion 2 x 10-4 K-1).


  • Superior mechanical properties and strength: 

    It can be challenging to reach low hardness with various elastomers. Momentive fluorosilicone elastomers enable low hardness down to 20 Shore without the need for plasticizers. They also show excellent dielectric strength, arc resistance, and low compression for sealing applications like O-rings and gaskets with complex designs.

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Momentive fluorosilicones sealing applications:

Momentive fluorosilicone elastomers are used in almost all industries ranging from automotive and aerospace to chemical processing, and O&G explorations. Applications include:
• O-rings and gaskets
• Membranes and diaphragms
• Seals in contact with fuel and oil
• Check-valves
• Turbo-charger hoses

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Momentive HCR Fluorosilicones:

    Density g/ cm3
    Hardness/ Durometer Shore A
    Tensile Strength, Mpa
    Elongation, %
    Tear Strength, Die B N/mm
    Compression Set, % (post-cured)
    FSE7340Pale Yellow1.434311.2500428
    FSE7360Pale Yellow1.476210.54003812
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