Fluorosilicone

Fuel‑ and solvent‑resistant elastomers for aerospace and defense, industrial and chemical processing, and other demanding applications. 

ElastaPro manufactures fluorosilicone (FVMQ) materials that resist fuels, oils, solvents, hydraulic fluids, and aggressive chemicals. Fluorosilicone rubber offers stable performance from –75°F to +450°F, exceptional compression set resistance, and long‑term durability.

All of ElastaPro’s fluorosilicones are Made in America and produced in accordance with our ISO 9001:2015 / AS9100D quality management system (QMS). We provide a full Certificate of Analysis (COA), lot traceability, and physical property verification with each batch.

Solid fluorosilicone rubber sheet from ElastaPro meets AMS-R-25988 and AMS3325 requirements. We also offer spec-grade fluorosilicone sheeting that meets AMS3326, AMS3327, and MIL-DTL-25988 standards. Fluorosilicone rolls and fluorosilicone compound from ElastaPro can meet these same specifications.

Request a Quote

Download Data Sheet

What is Fluorosilicone Rubber?

Fluorosilicone rubber combines the flexibility of silicone with fluorinated chemistry to deliver exceptional resistance to fuels, oils, and solvents. It maintains stable mechanical properties across a wide temperature range, performing reliably in environments where standard silicone would swell or degrade. FVMQ (Fluoro Vinyl Methyl Siloxane) is the ASTM designation for fluorosilicone.

Fluorosilicone vs. Silicone Rubber

• Fluorosilicone is more expensive than silicone rubber but provides greater resistance to fuels, oils, solvents, and aggressive chemicals.
• Silicone offers broader temperature resistance,  costs less, and is used in high-temperature applications that do not involve exposure to aggressive chemicals.
• The table below provides typical values for each elastomers.

Property	Fluorosilicone (FVMQ)	Standard Silicone (VMQ)
Fuel resistance	Excellent	Poor
Solvent resistance	Excellent	Poor
Temperature range	–75°F to +450°F	–80°F to +500°F
Cost	Higher	Lower
Use cases	Fuels, oils, chemicals	High-temp sealing

Fluorosilicone vs. Viton

• Fluorosilicone provides significantly better low‑temperature flexibility and superior weathering resistance than Viton.
• Viton withstands higher temperatures and provides greater mechanical strength for hot, high‑pressure sealing environments.
• The table below provides typical values for each elastomer.

Property	Fluorosilicone (FVMQ)	Viton (FKM)
Low‑temperature flexibility	Excellent	Fair
Fuel resistance	Excellent	Excellent
High‑temperature limit	450°F	500°F
Weather/ozone resistance	Excellent	Good
Compression set	Better	Good

Fluorosilicone Strengths and Weaknesses

Like all elastomers, fluorosilicone rubber has its strengths (advantages) and weaknesses (disadvantages). Consider them during material selection, especially when comparing fluorosilicone rubber to silicone or Viton.

Advantages

• Strong chemical resistance: Unlike silicone, fluorosilicone won’t swell, degrade, or soften from hydrocarbon-based fuels, petroleum oils, mineral oils, and common solvents.
• Wide operating range and thermal stability: Standard grades of FVMQ rubber maintain their properties across temperatures from around -65°C (-85°F) to 200°C (392°F).
• Environmental resistance: Fluorosilicone resists ultraviolet (UV) light from the sun, ozone in the air, weathering, and moisture.
• Flame resistance: FVMQ rubber resists ignition and will self-extinguish; however, it can char or degrade.
• Flexibility and resilience: Unlike Viton (FKM), fluorosilicone remains flexible and resists compression set.

Disadvantages

• Lacks mechanical robustness: Compared to general-purpose rubbers, fluorosilicone has lower tear strength and less resistance to abrasion, friction, and wear.
• Limited chemical resistance: Fluorosilicone does not resist all chemicals. Some hydraulic fluids may cause swelling or hardening. Strong acids cause rapid degradation.
• Gas Permeation: FVMQ is susceptible to gas permeation, which can limit its utility in vacuum systems and high-pressure gas sealing applications.
• Higher cost: Fluorosilicone generally costs less than Viton (FKM), but FVMQ is more expensive than silicone and significantly more expensive than commodity elastomers.
• Limited resistance to water and steam: FVMQ is not suitable for hot water or steam. Fresh water and salt water can cause swelling.

Fluorosilicone Sheets

ElastaPro supplies pre-cut fluorosilicone sheets in:

• Thicknesses from .010” to .500”
• Widths up to 65”
• Durometers from 40 to 70 Shore A.
• Colors are typically blue, but customer colors are available.

Fluorosilicone Sheet Thicknesses

Common fluorosilicones sheet thicknesses include:

• 1/64” (0.0156”)
• 1/32” (0.032”)
• 1/16” (0.062”)
• 3/32” (0.093”)
• 1/18” (0.125”)

Fluorosilicone Sheet Sizes

Common fluorosilicone sheet sizes include:

• 12” x 12”
• 12” x 24”
• 36” x 36”

Fluorosilicone Rolls

ElastaPro supplies continuous fluorosilicone rolls in

• Thicknesses from .010” to .500”
• Widths up to 65”
• Durometers from 40 to 70 Shore A.
• Colors are typically blue, but customer colors are available.

Often, customers order fluorosilicone roll stock that is 36” wide.

Fluorosilicone Compound

Fluorosilicone uncured compound (FVMQ) arrives ready for curing and can be calendered, extruded, or compression molded. It offers the same high-performance characteristics as the solid fluorosilicone sheet materials we provide.

Fluorosilicone vs. Fluoro Silicone

Fluorosilicone and fluoro silicone refer to the exact same material—there is no technical difference at all, only a spelling preference. “Fluorosilicone” is the standard, chemistry‑accurate term for FVMQ elastomers containing fluorinated side groups that improve fuel and solvent resistance. Some manufacturers and distributors break it into two words (“fluoro silicone”) for readability, but both describe the same family of elastomers with identical performance characteristics, chemical structure, and application profiles. Whether written as one word or two, the material delivers the same combination of silicone‑like flexibility and fluorinated chemical resistance used in aerospace, defense, and fuel‑system sealing.

Fluorosilicone O-Ring Materials

Fluorosilicone compound from ElastaPro can be molded into fluorosilicone O-rings. Sizes vary but are available for both military and civilian applications.

Spec Grade Fluorosilicone Sheets, Rolls, and Uncured Compound

ElastaPro offers fluorosilicone sheets, rolls, and uncured compound that meet AMS specifications from SAE International and U.S. military specifications that meet detail (MIL-DTL) standards.

AMS Fluorosilicones

AMS fluorosilicones meet Aerospace Materials Specifations (AMS) from SAE International. ElastoPro offers these materials.

• AMS3325

• AMS3326

• AMS3327

MIL-DTL-25988 and AMS-R-25988 Fluorosilicones

MIL-DTL-25988 appears on older part drawings but has been superseded by AMS-R-25988. ElastaPro supplies the following Types (TY), Classes (CL), and durometer-based grades (GR).

• AMSR25988 TY 2 CL1 GR40

• AMSR25988 TY2 CL1 GR50

• AMSR25988 TY2 CL1 GR60

• AMSR25988 TY2 CL1 GR70

Fluorosilicone Applications

Fluorosilicone rubber from ElastaPro can be fabricated into seals, gaskets, O-rings, and other parts for these and other applications.

Aerospace and Defense

• Fuel system O‑rings for jet‑A, JP‑8, and avgas exposure
• Gaskets and seals in aircraft fuel manifolds and fuel pump housings
• Diaphragms in fuel pressure regulators and metering valves
• Connector seals for MIL‑spec electrical connectors exposed to fuels
• UAV fuel bladder seals and propulsion‑system gaskets
• Hydraulic system seals where Skydrol or phosphate esters are present
• Environmental sealing boots on avionics and sensor housings

Automotive and Transportation

• Fuel injector O‑rings and fuel rail seals
• Turbocharger wastegate diaphragms exposed to oil mist and heat
• Vapor‑management system gaskets (EVAP systems)
• Fuel pump module seals
• Quick‑connect fuel line seals
• Transmission and powertrain vent seals

Industrial and Chemical Processing

• Pump and valve seals exposed to aromatic solvents
• Chemical transfer hose gaskets
• Metering pump diaphragms
• Solvent‑tank access‑panel gaskets
• Instrumentation seals for analyzers and chemical sensors

Energy, Oil and Gas

• Downhole tool seals requiring low‑temperature flexibility
• Fuel handling system gaskets for diesel and kerosene
• Compressor and generator fuel‑system O‑rings
• Chemical injection pump diaphragms

Electronics and Harsh‑Environment Enclosures

• Connector grommets and sealing boots for fuel‑exposed electronics
• Sensor housing gaskets in fuel‑rich or solvent‑rich environments
• Cable‑entry seals for aerospace and industrial control systems

Marine and Off‑Highway Equipment

• Diesel fuel system O‑rings
• Hydraulic system seals exposed to oils and additives
• Environmental gaskets for marine engine compartments

Fluorosilicone Rubber Price

Fluorosilicone is a high-performance material with different pricing for:

• raw materials
• low volumes vs. high volumes
• standard vs. specification-grade.

Prices are relatively stable, but there is high demand in the aerospace, defense, and automotive sectors because of fluorosilicone’s fuel and oil resistance. Request a quote from ElastaPro.

Fluorosilicone Rubber Temperature Range

Fluorosilicones generally operate from approximately –60°C to +200°C. While its high‑temperature limit is slightly lower than standard silicone, its chemical resistance makes it the preferred choice in fuel‑rich or solvent‑exposed environments.

FAQs about Fluorosilicone Rubber

Are fluorosilicone compatible with gasoline, diesel, and jet fuel?

Yes. Fluorosilicones are specifically engineered for resistance to fuels including gasoline, diesel, aviation fuels (Jet‑A, JP‑8), and many aromatic hydrocarbons. This is one of its primary advantages over standard silicone.

What chemicals are fluorosilicones NOT compatible with?

Fluorosilicones are not recommended for use with strong acids, strong bases, ketones (like MEK or acetone), or phosphate esters. These chemicals can cause degradation or excessive swelling. For these environments, engineers typically consider FKM/Viton™, EPDM, or specialty elastomers.

Do fluorosilicones have good compression set resistance?

Fluorosilicones have moderate compression set performance—better than many hydrocarbon elastomers but not as strong as high‑performance silicone or FKM.

Engineers often compensate with gland design, increased cross‑section, or optimized durometer selection.

Can fluorosilicones be used for food‑contact applications?

Generally no. Fluorosilicones are not typically formulated for FDA, BfR, or food‑contact compliance. Standard silicone or platinum‑cured food‑grade silicone is preferred for those applications.

Are fluorosilicones more expensive than standard silicone?

Yes. Fluorosilicones are more expensive due to its specialized chemistry and narrower production base. Engineers typically specify it only when fuel or solvent resistance is essential to system performance.

Can fluorosilicones be bonded, laminated, or PSA‑backed?

Yes. Fluorosilicone sheets can be laminated with pressure‑sensitive adhesives, bonded to fabrics, or converted into multi‑layer assemblies. Adhesive selection must consider chemical exposure and temperature.

Is fluorosilicone suitable for low‑temperature sealing?

Yes. Fluorosilicone maintains flexibility down to approximately –60°C, making it suitable for cold‑weather aerospace and defense applications where fuel exposure is present.

Does fluorosilicone resist ozone and UV?

Yes. Like standard silicone, fluorosilicone has excellent resistance to ozone, UV, and weathering, making it suitable for outdoor or long‑term environmental exposure.

Ask ElastaPro for Fluorosilicone Sheets, Rolls, and Compounds

Selecting the right material is critical for the success of any project. ElastaPro offers reliable and high-performance solutions. Contact ElastaPro today to discuss your needs and discover the right solution for your application.

Technical Articles

Fluorosilicone Chemical Compatibility Charts

Fluorosilicone COA with Every Batch

Military Silicones and Fluorosilicones

Fluorosilicone Test Reports

In March 2026, ElastaPro asked ACE Laboratories of Ravena, Ohio to requalify four spec-grade fluorosilicones.

All four AMS-R-25988 / MIL-DTL-25988 materials passed the tests and have been requalified.

Contact ElastaPro for any of these test reports.

AMS-R-25988B Type II Class 1 Grade 40 Fluorosilicone

AMS‑R‑25988B Type II Class 1 Grade 40 fluorosilicone is a low‑durometer, fuel‑resistant elastomer engineered for aerospace, defense, and industrial sealing environments. With a nominal hardness of 40 Shore A, it delivers excellent flexibility, strong elongation, and reliable sealing performance at low temperatures. This grade maintains stability when exposed to jet fuel, oils, hydraulic fluids, and aggressive chemicals, making it ideal for gaskets, O‑rings, and molded components. As a Type II Class 1 material, it meets stringent physical property and fluid‑immersion requirements, providing consistent performance, traceability, and compliance for mission‑critical applications.

AMS-R-25988B Type II Class 1 Grade 50 Fluorosilicone

AMS‑R‑25988B Type II Class 1 Grade 50 fluorosilicone from ElastaPro is a medium‑durometer, fuel‑resistant elastomer designed for aerospace, defense, and industrial sealing applications. With a nominal hardness of 50 Shore A, it provides a balanced combination of flexibility, tensile strength, and durability.

This grade maintains reliable performance when exposed to jet fuel, oils, hydraulic fluids, and aggressive chemicals, making it ideal for gaskets, O‑rings, and molded components in harsh environments. As a Type II Class 1 material, it meets stringent physical property, heat‑aging, and fluid‑immersion requirements, ensuring consistent, traceable performance for mission-critical systems.

MIL-DTL-25988D Type II Class 1 Grade 60 Fluorosilicone

MIL‑DTL‑25988D Type II Class 1 Grade 60 fluorosilicone from ElastaPro is a high‑performance, medium‑firm elastomer engineered for demanding aerospace, defense, and industrial sealing environments. With a nominal hardness of 60 Shore A, it offers increased strength, improved tear resistance, and enhanced durability while maintaining flexibility across wide temperature extremes.

This grade delivers exceptional resistance to jet fuel, oils, solvents, and aggressive chemicals, making it ideal for gaskets, O‑rings, and molded components exposed to harsh fluids. As a Type II Class 1 material, it meets stringent physical property, heat‑aging, and fluid‑immersion requirements, ensuring reliable, traceable performance in mission‑critical applications.

AMS-R-25988B Type II Class 1 Grade 70 Fluorosilicone

AMS‑R‑25988B Type II Class 1 Grade 70 fluorosilicone from ElastaPro is a firm, high‑durometer elastomer engineered for the most demanding aerospace, defense, and industrial sealing environments. With a nominal hardness of 70 Shore A, it delivers excellent dimensional stability, strong tensile strength, and superior resistance to tear, extrusion, and deformation under load.

This grade maintains reliable sealing performance when exposed to jet fuel, oils, hydraulic fluids, and aggressive chemicals. As a Type II Class 1 material, it meets stringent physical property, heat‑aging, and fluid‑immersion requirements, ensuring consistent, traceable performance for mission‑critical gaskets, O‑rings, and molded components.

AMS‑R‑25988B Type II Class 1 Grade 70 fluorosilicone from ElastaPro  is a firm, high‑durometer elastomer engineered for extreme aerospace, defense, and industrial sealing environments. With a nominal hardness of 70 Shore A, it provides excellent dimensional stability, strong tensile strength, and superior resistance to tear and deformation under load. This grade maintains reliable performance when exposed to jet fuel, oils, hydraulic fluids, and aggressive chemicals, making it ideal for gaskets, O‑rings, and molded components requiring rigidity and durability. As a Type II Class 1 material, it meets stringent physical property and fluid‑immersion requirements, ensuring consistent, traceable performance in mission‑critical applications.