Fluotech (Xiamen) New Materials Co., Ltd. Fluotech (Xiamen) New Materials Co., Ltd.
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  • Fluoroelastomer (FKM)
  • FKM Precompound
Polyurethane Rubber (PU)
Polyurethane Rubber (PU) Polyurethane Rubber (PU)

Rubber Compounds

Fluoroelastomer Precompound

Cured polymers made of raw gum, accelerator and curing agent
Basic Data

Fluorine Content: 66-70%
Form: Solid
Specific Gravity: 1.81
Thickness: 2-8mm
Compression Set: 17
Finished Product: Slab
Color: Off-white / Transparent
Solubility: Ketones and Esters
Mooney Viscosity ML 1+10@ 121℃: 20-90
Typical Applications: O-rings, gaskets, oil seals, fuel hoses, sundries, and other products.

Fluoroelastomer precompound is formulated using a copolymer or terpolymer of hexafluoropropylene, vinylidene fluoride, and tetrafluoroethylene, together with curatives. It is designed for applications such as O-rings, seals, gaskets, calendered goods, and extruded tubing and hoses that require methanol resistance. FKM precompound also has high performance in manufacturing metal-bonded components, valve-stem seals, and other rubber parts with complex geometries.

Manufacturing Process
Internal Mixing and Sheeting Process
Internal Mixing and Sheeting Process
Cooling Process
Cooling Process
Cutting and Packaging Process
Cutting and Packaging Process
F375B Medium Mooney Bisphenol Copolymer Precompound, Hardness 77F375B Medium Mooney Bisphenol Copolymer Precompound, Hardness 77
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HT401A Medium Mooney Bisphenol Terpolymer Precompound, Hardness 78HT401A Medium Mooney Bisphenol Terpolymer Precompound, Hardness 78
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T405A Medium Mooney Bisphenol Terpolymer Precompound, Hardness 76T405A Medium Mooney Bisphenol Terpolymer Precompound, Hardness 76
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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) Typical Applications
F Series: Bisphenol Copolymer series. Miscellaneous applications with balanced performance and processing properties
F201A 25 1.83 66 13 220 78 16 -17 4.0% O-rings, gaskets, injection molding components
F301A 30 1.83 66 14 220 77 17 -17 3.9% O-rings, gaskets, and some sealing parts that required low compression set
F401A 40 1.83 66 15 210 76 15 -17 3.8% O-rings, gaskets, and some FDA-standard sealing components
F501A 50 1.83 66 15.3 230 76 16 -17 3.8% O-rings, gaskets, and sealing components
F601A 60 1.83 66 16.2 220 77 13 -17 3.5% O-rings, gaskets, and some sealing components that required low compression set
F901A 90 1.83 66 17.8 240 77 11 -17 3.5% O-rings, gaskets, and compression molding components
F375B 32 1.82 66 14.5 250 77 20 -17 3.7% Valve stem oil seals, shaft seals, and parts with complicated geometries
F475B 40 1.83 66 15 230 75 19 -17 4.0% Valve stem oil seals, shaft seals, and parts with complicated geometries
F561B 55 1.83 66 15.7 260 78 21 -17 4.0% Oil seals, oil shaft seals, and some parts require a bonding property
F445C 40 1.83 66 14.3 250 75 18 -17 4.0% Rubber parts with complicated shapes, like valves and bellows
F201E 22 1.84 66 13 250 75 25 -17 4.0% Hose and other extrusion parts
T and HT TL Series: Bisphenol Terpolymer series. Enhance resistance to heat & chemicals, combined with high resistance to compression set.
T401A 40 1.85 68 14.5 240 78 28 -13 3.0% General purpose, O-rings, gaskets, and moulded parts
T601A 60 1.85 68 15.4 230 79 24 -13 3.0% General purpose, O-rings, gaskets, moulded parts
T301B 35 1.86 68 13.5 250 77 35 -13 3.0% General purpose, oil seals, shaft seals, valve seals, and parts that require bonding or adhesion
T401B 40 1.86 68 14.6 260 77 35 -12 2.0% General purpose, oil seals, shaft seals, valve seals, and parts that require bonding or adhesion
T401C 46 1.86 68 14.2 270 77 26 -12 2.0% General purpose, O-rings and gaskets, moulded parts
T 201E 27 1.86 69 13.1 300 76 35 -12 2.0% Fuel hose that required bonding with ECO, like an extruded hose
HT 501C 50 1.89 70 14.8 250 79 39 -9 1.2% Rubber parts with complicated shapes
HT 601A 55 1.89 70 15.5 240 79 37 -9 1.2% Sealing components that required low fuel permeability
TL 301A 30 1.8 66 14 230 78 26 -19 4.0% General purpose, O-rings, gaskets, and extruded profiles
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 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

Fluoroelastomer precompounds are packaged in a carton box, weighing 25 kg per box. We provide options of 500 kg, 625 kg, and 700 kg per pallet for bulk shipping, sent through express delivery services such as FedEx, DHL, and others.

Packaging
Packaging
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.

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Phenyl Silicone (PVMQ)
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Fluorine Rubber Vulcanization Accelerator
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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