Fluorosilicone

Fluorosilicone rubber sheet and uncured compound from ElastaPro provides excellent chemical resistance to dilute acids and alkalines, and to non-polar fluids like petroleum oils, hydrocarbon fuels, diester and silicone oils. Solid sheet materials come in various thicknesses and widths and arrive ready for die cutting. Uncured compound arrives ready for compression molding. Both types of material meet AMSR25988 (formerly MIL-DTL-25988) requirements.

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What is Fluorosilicone Rubber?

Fluorosilicone rubber (FVMQ) is a specialty elastomer engineered for sealing in chemically aggressive and thermally extreme environments. Unlike standard silicone (VMQ), fluorosilicone rubber incorporates trifluoropropyl side groups into its polymer backbone, which dramatically enhances resistance to fuels, aromatic hydrocarbons, solvents, and mineral oils. This dual chemistry combines the low‑temperature flexibility of silicone with the chemical inertness of fluorocarbon rubber.

For engineers, key design considerations include:

• Operating range: typically -65°C to +200°C, with reliable elasticity across cycles.
• Compression set: improved in certain formulations, but gland design must mitigate extrusion risks.
• Limitations: poor abrasion resistance and incompatibility with phosphate esters or amines.

Typically, fluorosilicone rubber is specified when mission-critical seals must endure both temperature extremes and aggressive chemical exposure.

How Does Fluorosilicone Rubber Compare to Silicone Rubber?

In general, fluorosilicone is chosen when chemical exposure to fuels/solvents is unavoidable. Standard silicone is preferred for general sealing and thermal stability without aggressive chemical contact. The table below provides more information.

Fluorosilicone Rubber Sheet from ElastaPro

ElastaPro supplied fluorosilicone rubber sheet in four durometers: 40, 50, 60, and 70 Shore A. Click the links below to see individual data sheets.

• ESS40FS- 40 Durometer Fluorosilicone
• ESS50FS – 50 Durometer Fluorosilicone
• ESS60FS – 60 Durometer Fluorosilicone
• ESS70FS – 70 Durometer Fluorosilicone

Material Properties for ElastaPro’s Fluorosilicone Rubber Sheet

The table below lists typical properties for the four durometers of fluorosilicone rubber sheet that ElastaPro offers.

Spec Grade Fluorosilicone Rubber Sheet: AMSR25988 TY2 CL1 GR40-70

Solid fluorosilicone rubber sheet from ElastaPro meets AMSR25988 TY2 CL1 GR specifications and AMS3325 requirements.

• AMSR25988: The specification number
• TY2 (Type 2): This defines the material’s intended use as suitable for molded parts, sheets, strips, and extruded shapes.
• CL1 (Class 1): This indicates a general-purpose fluorosilicone material.
• GR (Grade): This refers to the material’s durometer (hardness) on the Shore A scale. The number following GR (e.g., GR60), specificies the exact hardness.

These are the specific spec grade fluorosilicone rubber sheet that ElastaPro makes.

• AMSR25988 TY 2 CL1 GR40

• AMSR25988 TY2 CL1 GR50

• AMSR25988 TY2 CL1 GR60

• AMSR25988 TY2 CL1 GR70

Uncured AMSR25988 Fluorosilicone Compound FVMQ

For manufacturers requiring flexibility in shaping and curing, the uncured AMSR25988 fluorosilicone compound provides a versatile option. Delivered ready for curing for various fabrication methods, including extrusion and molding, this material can be customized to specific applications while maintaining its adherence to industry standards. Whether used for molding, extrusion, or laminating, it offers the same high-performance characteristics as the solid sheets.

Fluorosilicone Rubber Sheet Sizes

ElastaPro’s fluorosilicone Solid Sheet is available in various forms and dimensions to suit diverse requirements. With thicknesses ranging from .010 inches to .500 inches, widths up to 65 inches, and offered in sheets or continuous roll lengths.

Customization is also available, including color-matching capabilities and pressure-sensitive adhesive (PSA) backing. These features make it easy to integrate the material into existing systems and projects. With durometer options spanning from 20 to 80, customers have a wide range of choices for their specific needs.

Fluorosilicone O-Rings

Fluorosilicone O-rings are specified in engineering environments where fuel, solvent, and extreme temperature exposure converge. From a design perspective, engineers must account for compression set behavior under prolonged thermal cycling. While fluorosilicone maintains elasticity at -65°C to +200°C, its mechanical strength is lower than fluorocarbon (FKM), requiring careful gland design to avoid extrusion under high pressure. Engineers should also evaluate volume swell in blended fuels; fluorosilicone O-rings excels in JP-8 and diesel environments but may show limitations in certain biofuels.

Fluorosilicone vs. Flourosilicone and Fluoro Silicone

Fluorosilicone solid sheets are used in a variety of industries where materials are exposed to extreme or challenging conditions. In aerospace and aeronautics, these sheets provide excellent resistance to fuels and high temperatures, making them ideal for sealing and insulating components in aircraft.

In the automotive industry, their durability under chemical exposure guarantees reliable performance for parts that encounter oils and fuels. Chemical processing systems also benefit from fluorosilicone’s ability to withstand solvents and other aggressive substances, having both longevity and dependable operation.

This combination of versatility and resilience makes this material suitable for many applications beyond these primary uses.

Made in USA Fluorosilicones

Flurosilicones from ElastaPro are domestically produced in Santa Fe Springs, California. These proven materials are also available with a full Certificate of Analysis (COA) for ever batch. Our COAs include key specifications such as tensile strength, elongation, compression set, hardness, and the results of temperature range testing. ElastaPro also performs a full qualification when there’s a change to a specification or we update a raw material. Plus, we conduct full lot-to-lot verification in accordance with the spec.  This spec uses a table (Table IV) for testing during the lot-to-lot qualification work, and we follow this procedure.

Fluorosilicone Rubber Sheet and Uncured Compound from ElastaPro

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.