Trade Names
  • FE — Shin-Etsu
  • Elastosil— Wacker
  • Silastic LS — Dow
  • FSE — General Electric
ASTM D1418 Designation
ASTM D2000/SAE J200 Type, Class
Apple Compound Designation
Standard Color
Fluorosilicone combines the good high and low temperature stability of Silicones with the fuel, oil, and solvent resistance of Fluorocarbons.
Key Use(s)
Aerospace fuel systems. Auto fuel emission control systems. Primarily for static sealing and low outgassing applications.
Temperature Range:
Standard Compound: -75°F to +400°F.
Hardness (Shore A)
40 to 80.
  • Fluorosilicone is most often used in aerospace applications for systems requiring fuel and/or diester-based lubricant resistance up to 400°F.
  • Although generally specified for aerospace use, due to its excellent fuel resistance and high temperature stability, Fluorosilicone is becoming an increasingly popular material for a wider range of sealing applications.
  • Featuring good compression set and resilience properties, fluorosilicone compounds are suitable for exposure to air, sunlight, ozone, chlorinated and aromatic hydrocarbons.
Due to limited physical strength, poor abrasion resistance, and high friction characteristics, Fluorosilicone elastomers are not generally recommended for dynamic sealing. They are predominantly designed for static sealing use. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.