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

Dow SILASTIC LS 4-9040 Fluorosilicone Rubber

Dow SILASTIC LS 4-9040 Fluorosilicone Rubber is a high-performance elastomer combining silicone’s thermal stability with fluorocarbon’s exceptional fuel, oil and solvent resistance. Ideal for aerospace and automotive sealing applications requiring extreme chemical and temperature resilience up to 200°C. Offers excellent compression set resistance and low-temperature flexibility down to –60°C.
  • dow silastic ls 4 9040 fluorosilicone rubber_dec8d579
  • dow silastic ls 4 9040 fluorosilicone rubber_dec8d579

Features Of Dow SILASTIC LS 4-9040 Fluorosilicone Rubber

  1. Excellent resistance to fuels, oils, and aggressive hydrocarbon-based chemicals across a wide temperature range.

  2. Outstanding low-temperature flexibility with continuous service capability down to –65 °C (–85 °F).

  3. Superior compression set resistance for long-term sealing performance in dynamic and static applications.

  4. Good high-temperature stability up to 200 °C (392 °F) for short-term exposure and 175 °C (347 °F) continuously.

  5. Easy processability via injection molding, compression molding, and extrusion—compatible with standard silicone equipment.

Typical Applications Of Dow SILASTIC LS 4-9040 Fluorosilicone Rubber

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

  2. Automotive under-hood components including turbocharger hoses, valve cover gaskets, and fuel injector O-rings.

  3. Oil & gas downhole instrumentation seals requiring resistance to sour gas, crude oil, and drilling fluids.

  4. Military and defense electronics enclosures requiring environmental sealing with chemical and thermal resilience.

  5. Industrial fluid handling systems involving aromatic solvents, chlorinated hydrocarbons, and phosphate ester hydraulic fluids.

Specifications Of Dow SILASTIC LS 4-9040 Fluorosilicone Rubber

Chemical TypeFluorosilicone elastomer (FVMQ)
Product FormHigh-consistency rubber (HCR), two-part platinum-cure system
AppearanceOpaque, off-white to light tan gum stock
Primary ApplicationsStatic and dynamic sealing in demanding chemical/thermal environments
Key FeaturesFuel/oil resistance, low-temp flexibility, low compression set, thermal stability
BenefitsExtended service life, reduced maintenance, compliance with aerospace and automotive specifications
Curing SystemPt-catalyzed addition cure (hydrosilylation)
Shelf Life12 months at 23 °C (73 °F) when stored unopened in original packaging


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