NITI Ventures | Fluorosilicone

Fluorosilicone O-Rings

Fluorosilicone combines much of silicone’s temperature flexibility with better resistance to fuels and hydrocarbons. It is commonly considered for fuel-related service where plain silicone is not fuel-resistant enough.

Typical temperature rangeAbout -50°C to +175°C typical, with some grades extending higher.

Other namesFluorosilicone, FVMQ

Hardness optionsCommon fluorosilicone hardness options may include 60, 70, and 80 Shore A.

Compliance optionsDepending on compound, fluorosilicone may be available with aerospace-oriented grades, automotive-oriented grades, and application-specific industrial compounds.

Best used for

Fuel exposure with low-temperature flexibility
Hydrocarbon and petroleum-based fluid exposure
Automotive and aerospace fuel systems
Low-temperature applications involving fuels or lubricants

Key advantages

Better fuel resistance than standard Silicone
Good low-temperature flexibility
Useful where both weather resistance and hydrocarbon exposure matter
Good heat resistance

Performs well in

Petroleum-based fuels
Lubricants
Hydrocarbons
Aromatic mineral oils
Many low-temperature fuel-system environments

Use with caution or avoid

Applications better served by FKM or FFKM
Simple non-fuel applications where standard silicone is enough
Highly wear-intensive service

Typical applications

Aerospace fuel systems
Automotive fuel-related sealing
Hydrocarbon hydraulic applications at lower temperatures
Static and moderate-duty industrial applications involving fuels and oils

Common industries

Aerospace
Automotive
Fuel handling systems
Industrial equipment with hydrocarbon exposure

When to choose Fluorosilicone

Choose Fluorosilicone when silicone temperature flexibility is attractive but plain VMQ is not fuel-resistant enough.

When not to choose Fluorosilicone: Avoid or review carefully when you need the broadest chemical resistance, or when fuel resistance is not needed and standard silicone is sufficient.

Selection guide

This is a practical selection guide. Final material choice should always be checked against actual fluid, temperature, pressure, movement, environment, and any approval requirement for the exact compound.

Other materials

Need help selecting the right material?

Tell us your fluid, temperature, pressure, size, and whether the seal is static or dynamic. We can help review the most suitable starting options before final size and compound selection.