Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Dow SILASTIC LS-4940 Fluorosilicone Rubber

Dow SILASTIC LS-4940 Fluorosilicone Rubber is a high-performance elastomer combining silicone’s thermal stability with fluorocarbon’s fuel/oil resistance. It offers excellent low-temperature flexibility (–60 °C), compression set resistance, and broad chemical compatibility—ideal for aerospace, automotive, and oilfield sealing applications requiring reliability under extreme conditions.
  • dow silastic ls 4940 fluorosilicone rubber_4d71eeed
  • dow silastic ls 4940 fluorosilicone rubber_4d71eeed

Features Of Dow SILASTIC LS-4940 Fluorosilicone Rubber

  1. Excellent resistance to fuels, lubricants, and aggressive hydrocarbon-based chemicals.

  2. Broad service temperature range from –65 °C to +200 °C (–85 °F to +392 °F) with retained elasticity.

  3. Superior compression set resistance compared to standard silicone elastomers.

  4. Good low-temperature flexibility and weathering stability.

  5. Platinum-cured formulation enabling consistent, reproducible vulcanization without byproducts.

Typical Applications Of Dow SILASTIC LS-4940 Fluorosilicone Rubber

  1. Aerospace fuel system seals and gaskets exposed to jet fuels and synthetic lubricants.

  2. Automotive under-hood components requiring resistance to engine oils and transmission fluids.

  3. Oil & gas downhole instrumentation seals subjected to sour gas and hydrocarbon exposure.

  4. Industrial fluid-handling systems operating with aromatic solvents and chlorinated hydrocarbons.

  5. Medical device components requiring biocompatibility support and chemical inertness.

Specifications Of Dow SILASTIC LS-4940 Fluorosilicone Rubber

Chemical TypeFluorosilicone elastomer (FVMQ)
Product FormTwo-part liquid silicone rubber (LSR), Part A + Part B
AppearanceTranslucent to slightly hazy viscous liquid
Base PolymerFluoroalkyl-substituted poly(methylvinylsiloxane)
Cure SystemPt-catalyzed hydrosilylation
Shore A Hardness (Cured)40 ± 3
Density (g/cm³)1.25–1.30
Primary ApplicationsStatic and dynamic sealing in chemically aggressive environments


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