Fluorosilicone o-rings feature excellent low temperature performance and resistance to most jet fuels and mineral oils, making them ideal for use in aerospace, automotive and some semiconductor applications. Fluorosilicone o’rings are a hybrid of Silicone and FKM materials.

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Service Temperature Range
Low Temp. Range, °F Abbv. High Temp. Range, °F Compr. Set Oils Steam Weather/
Fuels Acids/
Bases Abrasion Wear Permeation
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temperature range chart
  • Excellent
  • Moderate
  • Poor
  • Specialty Compounds Only


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Popular Allorings Compounds
Compound Relative
Low Temp ° F High Temp ° F Durometer Color Special
View Datasheet Relative Price: 3 Relative Availability: 3 -80  350  70  Blue 
Compatibile with most jet and auto fuels. Formulated to meet Military and Aerospace specifications. 
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Common Names
Fluorosilicone, FVMQ

Trade Name:  Silastic® LS,   FSE

General Description:

Fluorosilicone is a widely used elastomer that can be compounded to meet a wide range of applications.  The mechanical and physical properties are very similar to silicone rubber. However, fluorosilicone offers improved fuels and mineral oil resistance but poor hot air resistance when compared with silicone. This material is widely used in semiconductor Ashing equipment for its resistance to oxygen plasma. 


  • Excellent flexibility and resistance to compression set
  • Excellent resistance to aging and weather-sunlight
  • Resistance to oxidizing chemicals, animal and vegetable oils, fuels, aromatic and chlorinated solvents
  • Resistant to diluted alkalies, diester oils, aliphatic and aromatic fluorocarbons, silicone oil, toluene, benzene, ozone and oxidative environments.



  • Brake fluids, ketones, hydrazine, adelhydes, amines, ketones
  • Poor abrasion resistance


Service Temperature:

  • -80o to 350o F (-62o to 177o C)