Fluorosilicone O-Rings
Fluorosilicone O-Rings (FVMQ O-Rings)
Fluorosilicone O-rings (FVMQ) combine the excellent low-temperature flexibility of silicone with enhanced resistance to fuels, oils, and hydrocarbons. This unique combination makes FVMQ a specialized sealing material widely used in aerospace, aviation, automotive fuel systems, and high-performance industrial equipment where standard silicone O-rings may fail. Fluorosilicone is particularly valued in applications that require both fuel compatibility and reliable sealing across a wide temperature range.
What Is Fluorosilicone (FVMQ)?
Fluorosilicone is a modified silicone elastomer containing fluorinated side groups within its polymer structure. Compared with standard VMQ silicone, FVMQ offers significantly improved resistance to:
- Aviation fuels
- Gasoline and diesel
- Aromatic hydrocarbons
- Mineral oils
- Jet fuel
- Ozone and weather exposure
While maintaining the flexibility and compression-set characteristics that make silicone-based materials attractive for sealing applications.
Why Choose Fluorosilicone O-Rings?
Excellent Fuel Resistance
One of the biggest advantages of FVMQ is its ability to withstand fuels that would quickly degrade conventional silicone rubber.
Fluorosilicone O-rings are commonly specified for:
- Aircraft fuel systems
- Fuel injectors
- Fuel pumps
- Aerospace hydraulic equipment
- Automotive fuel delivery systems
This makes FVMQ one of the most trusted sealing materials in aviation and transportation industries.
Wide Operating Temperature Range
FVMQ remains flexible at extremely low temperatures while maintaining stability at elevated temperatures.
| Property | Typical Value |
|---|---|
| Low Temperature | -60°C |
| High Temperature | +177°C |
| Standard Hardness | 70 Shore A |
This broad temperature capability makes fluorosilicone suitable for outdoor, aerospace, and environmental control systems.
Outstanding Ozone and Weather Resistance
Like standard silicone, fluorosilicone provides excellent resistance to:
✓ Ozone
✓ UV exposure
✓ Oxidation
✓ Weathering
✓ Environmental aging
These characteristics help extend service life in outdoor and aerospace environments.
Chemical Compatibility
Recommended Media
Fluorosilicone O-rings perform well with:
✓ Jet fuel
✓ Gasoline
✓ Diesel fuel
✓ Aromatic mineral oils
✓ Benzene
✓ Toluene
✓ Ozone and outdoor exposure
Not Recommended For
FVMQ is generally not the best choice for:
✗ Brake fluids
✗ Ketones
✗ Hydrazine
✗ High-abrasion dynamic applications
Selecting the wrong material can lead to swelling, degradation, or premature seal wear.
How to Select the Right Fluorosilicone O-Ring
Before choosing a Fluorosilicone O-ring, verify:
- Fuel or oil compatibility
- Minimum operating temperature
- Static versus dynamic sealing conditions
- Required certifications (FDA, aerospace, military, UL)
- Compression and groove design
Because FVMQ has lower abrasion resistance than many industrial elastomers, it generally performs best in static sealing applications rather than high-speed dynamic environments.
Preferred Environmental Guidelines for Fluorosilicone Rubber O-rings
Performs Well In:
- Fuels
- Aromatic mineral oils
- Benzene, toluene
- Ozone and weather
Doesn't Perform Well In:
- Brake fluid
- Ketones
- Hydrazine