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Silicone Rubber: Fluoro Liquid Silicone Rubber (F-LSR)

SILASTIC™ Fully Fluorinated Liquid Silicone Rubber: Properties, Processing, and Applications

Fluorosilicones (FVMQs) are highly suitable for applications requiring wide operating temperatures and fluid resistance. Their unique physical properties make them a material of choice in applications requiring contact with aggressive elements such as oils and fuels, coolants, and corrosive blowby gases. As the landscape for mobility materials becomes more competitive, Dow’s fluorosilicone technologies have evolved to offer greater flexibility for meeting rigorous chemical resistance requirements.

Dimethyl based liquid silicone rubber (LSR) was initially developed to allow manufacturers to produce rubber parts more efficiently by providing fast cycle times, material waste reduction, flashless molding, and automated processing. To take advantage of the strengths of both LSR and fluorosilicone technologies, Dow created a range of fully fluorinated LSRs that allow the desirable process efficiencies of LSR to be integrated with the fluid resistance performance capabilities of a fluorosilicone. The benefits include:

  • Wide operating temperature (-70C to 200C); excellent low temperature performance compared to dimethyl LSR and FKM
  • Available in 30, 40, and 60 ShoreA, mechanical properties comparable to standard LSRs
  • Low compression set
  • Excellent resistance to non-polar hydrocarbon fuels, oils, and solvents; comparable to standard high consistency FSR grades
  • Compatible with standard injection molding equipment
  • Fast cycle times and less material waste

Examples of applications include:

  • Fuel line safety seals
  • Oil system seals
  • Fuel cell gasketing
  • Turbocharger hoses
  • Intercooler hoses


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