Fluotech (Xiamen) New Materials Co., Ltd. Fluotech (Xiamen) New Materials Co., Ltd.
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  • FKM Precompound
FKM Precompound
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Rubber Compounds

Fluoroelastomer Precompound

Cured polymers made of raw gum, accelerator and curing agent

Fluoroelastomer precompound is an intermediate material used in the production of high-performance rubber products. It is primarily composed of FKM raw gum, which has a high fluorine content and strong carbon-fluorine bond stability, ensuring excellent chemical and heat resistance. The raw gum is typically produced through free radical polymerization of vinyl monomers, such as vinylidene fluoride (VDF). At the precompound stage, curing agents, accelerators, and other additives are introduced to enhance processing and performance characteristics. However, the mixing intensity and ingredient ratios differ from fully compounded materials, allowing manufacturers to further adjust the formulation based on specific application needs.

Fluoroelastomer precompound is widely used in applications that require chemical resistance and durability, making it a key material for seals, oil hoses, gaskets, and pipeline linings. Once processed, it is commonly found in automotive components, petrochemical equipment, aerospace systems, and semiconductor manufacturing, where long-term performance under demanding conditions is required.

  • FKM Precompound
  • FKM Precompound
  • FKM Precompound
  • FKM Precompound
  • FKM Precompound
Typical Applications
Automotive Industry

Used in engine seals and fuel hoses, providing resistance to high temperatures and exposure to fuels and lubricants. Helps maintain vehicle performance and reliability under demanding operating conditions.

Automotive Industry
Petrochemical Industry

Applied in reactor vessels, pumps, valves, and pipeline linings, offering resistance to strong acids, bases, and organic solvents. Enhances operational safety by preventing leaks and material degradation in chemical processing environments.

Aerospace Industry

Used in aircraft engines, hydraulic systems, and fuel system seals, capable of withstanding high temperatures, pressure variations, and aggressive fluids. Contributes to the efficiency and durability of aerospace components.

Electronics & Semiconductor Industry

Utilized in chip packaging and equipment seals, benefiting from chemical stability and low gas permeability. Helps protect electronic components and maintain manufacturing precision in semiconductor production.

FKM Precompound Selection Guide
Product Code Nominal Viscosity ML (1+10) Specific Gravity (g/cm³) Fluorine Content (%) Tensile (MPa) Elongation (%) Hardness Shore A Compression Set (%) 70h@200℃ TR10 (℃) Volume Change (Fuel C)
F201A 25 1.83 66 13 220 78 16 -17 4.0%
F301A 30 1.83 66 14 220 77 17 -17 3.9%
F401A 40 1.83 66 15 210 76 15 -17 3.8%
F501A 50 1.83 66 15.3 230 76 16 -17 3.8%
F601A 60 1.83 66 16.2 220 77 13 -17 3.5%
F901A 90 1.83 66 17.8 240 77 11 -17 3.5%
F375B 32 1.82 66 14.5 250 77 20 -17 3.7%
F475B 40 1.83 66 15 230 75 19 -17 4.0%
F561B 55 1.83 66 15.7 260 78 21 -17 4.0%
F445C 40 1.83 66 14.3 250 75 18 -17 4.0%
F201E 22 1.84 66 13 250 75 25 -17 4.0%

For more information, please refer to the PDF below.

FKM Precompound Properties

Fluoroelastomer precompound is designed for applications that require chemical resistance, thermal stability, and reliable mechanical properties. Its formulation allows for customization based on processing and performance requirements, making it suitable for a wide range of industries.

  • Chemical and Oil Resistance

    Resistant to chemical corrosion, making it suitable for seals in pumps and equipment containers used in chemical processing. Helps prevent leaks and degradation when exposed to aggressive substances.

    Performs well in oil-rich environments, resisting swelling and deterioration when in contact with petroleum-based and synthetic oils, lubricants, and fuels. It is commonly used in engine seals, transmission components, and valve seals where long-term oil resistance is required.

  • Thermal Performance

    Designed for long-term use in high-temperature environments, maintaining stable properties at 200°C and above. Certain grades can withstand short-term exposure to 250°C–300°C, making it one of the most heat-resistant elastomers available. This allows it to perform reliably in applications exposed to continuous heat and thermal cycling.

    Performance at low temperatures is relatively limited, with elasticity retention typically ranging between -15°C and -20°C. As the temperature decreases, tensile strength increases, but reduced flexibility may lead to sealing challenges and potential leakage in extremely cold conditions.

  • Low Gas Permeability

    Its dense polymer structure minimizes gas transmission and leakage, making it suitable for vacuum systems, aerospace components, and other applications where maintaining an airtight seal is critical.

  • Flame Resistance

    Fluoroelastomer precompound has inherent flame-retardant properties, allowing it to self-extinguish when exposed to fire. This characteristic enhances safety in high-risk environments, reducing the risk of fire-related failures.

  • Processability and Versatility

    The precompounding process improves workability, making it suitable for compression molding, extrusion, and injection molding. Manufacturers can easily shape it into custom rubber components for diverse industrial applications, ensuring compatibility with different production requirements.

  • Mechanical Properties

    High tensile and tear strength ensure durability under continuous stress, reducing the risk of cracking or damage. This enhances the longevity and reliability of components used in demanding applications.

    Moderate hardness, typically ranging from Shore A 70–80, provides a balance between rigidity and flexibility. This allows parts to maintain their shape and structural stability over extended use.

    Excellent resistance to permanent deformation, enabling components to recover their original shape and dimensions after prolonged stress or compression. Low compression set helps maintain long-term sealing performance in gaskets and other sealing applications.

Packaging

Supplied in sheet form to facilitate storage, handling, and processing. Standard packaging includes 20kg per box, with palletized options of 500kg, 700kg, or 800kg for bulk orders. To accommodate different application needs, we also offer customized packaging solutions, ensuring flexibility in size and format based on specific requirements.

Packaging
Packaging
Support and Service
Processing Support

FKM raw gum can be processed using compression molding, extrusion, and injection molding, depending on the application. Compression molding is ideal for complex shapes and high-precision components, while extrusion is suited for continuous forms such as tubes and strips. Injection molding is preferred for high-volume production of standardized parts, offering efficiency and consistency.

Value-Added Service

We provide customized formulation design to meet specific application requirements, adjusting the compound properties and processing parameters based on the intended use. We also offer technical consultation and training services to help customers optimize material performance, improve production efficiency, and enhance product quality.

Types of FKM
  • FKM Raw Gum
    FKM Raw Gum
  • FKM Precompound
    FKM Precompound
  • FKM Compound
    FKM Compound
Contact Us
  • ada@fluotechrubber.com
  • +86-592-7213752
  • +86-13753601944
Want to learn more about our rubber compounds or industrial rubber products?

Feel free to reach out to us for any inquiries.

Related Products

Rubber Compounds & Industrial Rubber Products
Fluorosilicone Rubber (FVMQ)
Fluorosilicone Rubber (FVMQ)
Perfluoroelastomer (FFKM)
Perfluoroelastomer (FFKM)
Phenyl Silicone (PVMQ)
Phenyl Silicone (PVMQ)
Fluorine Rubber Vulcanization Accelerator
Fluorine Rubber Vulcanization Accelerator
Why Us

Why Choose Us

We specialize in the research and production of rubber compounds and industrial rubber products. With over 30 years of expertise in rubber compounding, our R&D team has in-depth knowledge in polymer materials, chemistry, and other technical fields, providing strong support for the development of specialized rubber materials.

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Industry Solutions

Rubber solutions for Various Applications

We provide specialty rubber solutions for a wide range of industries, including automotive, semiconductor manufacturing, oil and gas, aerospace, and wearable technology. Each sector presents unique challenges, from high-temperature resistance and chemical exposure to precision sealing and mechanical durability.

Explore All Applications
Automotive
Rubber Compound Solutions Automotive
Petrochemical
Rubber Compound Solutions Petrochemical
Smart Wearables
Rubber Compound Solutions Smart Wearables
Semi-Conductor
Rubber Compound Solutions Semiconductor
Aerospace
Rubber Compound Solutions Aerospace
Fluotech (Xiamen) New Materials Co., Ltd. Your trusted partner in special rubber compounds for aerospace, automotive, and other high-performance applications
ada@fluotechrubber.com
+86-592-7213752
+86-13753601944
Products
  • Hydrogenated Nitrile Rubber (HNBR)
  • Fluoroelastomer (FKM)
  • Fluorosilicone Rubber (FVMQ)
  • Perfluoroelastomer (FFKM)
  • Phenyl Silicone (PVMQ)
  • Fluorine Rubber Vulcanization Accelerator
  • Perfluorinated Polyether Oil (PFPE Oil)
Applications
By Industries
  • Automotive
  • Semiconductor
  • Petrochemical
  • Aerospace
  • Smart Wearables
By Function
  • Low Temperature Resistant
  • High Temperature Resistant
  • Chemical Resistant
  • Oil & Corrosion Resistant