Momentive Fluorosilicone Elastomers

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, such as 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

Momentive fluorosilicones applications:

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

Types of fluorosilicones:

Over the last several years, the marketplace for molded silicone rubber parts has moved toward using 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 available in two primary forms:
 

• FSE Heat-Cured Elastomers: These 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.

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.

 

 

• Long-lasting in engine oils: 

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

 

 

• Low swelling in fuels: 

  Momentive performance fluorosilicones provide low-volume swelling, making them excellent for use in static and dynamic seals around fuel systems.

 

 

 

• 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 byproducts.

 

• 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 up to 200°C. Thermal conductivity of 0.25 W/m·K can also be modified by compounding. (Coefficient of thermal expansion 2 x 10-4 K-1).

Momentive HCR Fluorosilicones: