Introduction to FKM Rubber

Fluoroelastomers, commonly known as FKM rubber, represent a specific category of synthetic rubber renowned for its exceptional resistance to heat, chemicals, and oil. The term “FKM” is derived from the German abbreviation “Fluor-Kautschuk-Material,” which translates to fluorine rubber material. This elastomer has gained significant attention in various industries due to its unparalleled performance under extreme conditions.

Definition and Common Names

FKM is a family of fluorocarbon-based fluoroelastomer materials. These materials are defined by specific international standards, such as ASTM International standard D1418 and ISO standard 1629. While “FKM” is a widely accepted term, this rubber is also commonly referred to as fluorine rubber or fluoro-rubber. One of the most recognized brand names under which FKM was initially developed is “Viton,” a trademark that originally belonged to DuPont but is now owned by Chemours.

Historical Development and Key Manufacturers

The journey of FKM rubber began with its development by DuPont, under the brand name Viton. However, the production and advancement of FKM rubber are not limited to a single company. Over the years, several global giants, including Daikin (producing under the name Dai-El), 3M (known for its Dyneon brand), and Solvay S.A. (with its Tecnoflon brand), have ventured into the production of FKMs. Additionally, numerous manufacturers from China have also made significant contributions to the FKM market, ensuring its widespread availability and application.

FKM’s unique properties, primarily its resistance to various chemicals and elevated temperatures, make it more expensive than other elastomers like neoprene or nitrile rubber. However, the benefits it offers, especially in demanding applications, justify its cost.

The Chemistry Behind FKM Rubber

Understanding the chemistry of FKM rubber is crucial to appreciate its superior properties and wide-ranging applications. At its core, FKM is a copolymer comprised of multiple monomers, where the presence of fluorine plays a pivotal role in its exceptional characteristics.

Chemical Composition and Varieties

FKM rubber is primarily composed of vinylidene fluoride (VDF) or hexafluoropropylene (HFP). The specific type of FKM is determined by the amount and type of fluorinated monomers in its composition. There are several types of FKM, each with its unique composition and properties:

  • Type 1: A dipolymer of VDF and HFP.
  • Type 2: A terpolymer of VDF, HFP, and tetrafluoroethylene (TFE).
  • Type 3: A terpolymer containing VDF, TFE, and a cure site monomer.
  • Type 4: A tetrapolymer composed of VDF, HFP, TFE, and a cure site monomer.

Each type offers distinct properties, making them suitable for specific applications. For instance, Type 2 FKMs are known for their excellent fluid resistance, while Type 3 FKMs are preferred for their superior compression set resistance.

The Role of Fluorine in FKM

Fluorine atoms in FKM rubber are responsible for its outstanding resistance to heat, chemicals, and oxidation. The strong bonds formed by fluorine atoms make the polymer chain highly stable, even under extreme conditions. This stability translates to prolonged service life, reduced maintenance, and overall cost savings, especially in demanding industrial applications.

Properties of FKM Rubber

FKM rubber stands out in the elastomer family due to its unique set of properties, which make it the material of choice for many challenging applications.

Temperature and Chemical Resistance

FKM rubber can withstand temperatures ranging from -20°C to 220°C, making it suitable for high-temperature applications. Its resistance to a wide variety of chemicals, including oils, fuels, and most mineral acids, is unparalleled. This chemical resistance is attributed to the high fluorine content in the polymer.

Density and Physical Characteristics

FKM has a density ranging from 1.8 to 2.0 g/cm³, depending on its specific type and formulation. It offers excellent mechanical properties, including high tensile strength, elongation, and hardness. These physical characteristics, combined with its thermal and chemical resistance, make FKM a versatile material.

Comparison with Other Elastomers

While other elastomers like NBR (nitrile rubber) and EPDM (ethylene propylene diene monomer rubber) have their advantages, FKM’s superior resistance to heat, chemicals, and aging sets it apart. Its longevity and performance in harsh environments often justify the higher initial cost compared to other rubber types.

Applications of FKM Rubber

The unique properties of FKM rubber make it a preferred choice for a myriad of applications across diverse industries. Its resilience against harsh chemicals, high temperatures, and aggressive environments ensures that machinery and equipment function optimally and have extended lifespans.

Aerospace and Aviation

In an industry where safety and performance are paramount, FKM rubber is extensively used in seals, gaskets, and O-rings. Its ability to resist jet fuels, lubricants, and high temperatures makes it indispensable in aircraft engines, fuel systems, and hydraulic actuators.

Chemical Processing and Petroleum Refining

FKM’s resistance to a wide range of chemicals, including aliphatic hydrocarbons, aromatic hydrocarbons, and chlorinated hydrocarbons, makes it the go-to material for seals and gaskets in chemical plants and refineries. It ensures that processes run smoothly without the risk of leaks or contamination.

Automotive Industry

Modern cars and trucks rely heavily on FKM rubber, especially in fuel systems and engine components. From fuel injector O-rings to manifold gaskets, FKM ensures that vehicles operate efficiently, reducing emissions and improving fuel economy.

Wearables and Consumer Products

The rise of smart wearables has seen an increased use of FKM rubber, especially in watch bands and fitness trackers. Its hypoallergenic properties, combined with resistance to sweat and cosmetics, make it a popular choice for wearable tech.

Suzhou Baoshida Rubber: China’s Premier FKM Rubber Supplier

When it comes to high-quality FKM rubber products, Suzhou Baoshida Rubber stands out as a leader in the industry. With a rich history and a commitment to innovation, the company has established itself as a trusted supplier for businesses worldwide.

Company Overview and Expertise

Established in 2007, Suzhou Baoshida Rubber has consistently delivered top-tier rubber products, including FKM seals, O-rings, and specialized rubber tools. Their dedication to quality, combined with a deep understanding of the industry’s needs, has cemented their reputation as a reliable partner.

Custom Solutions and Services

Recognizing that every industry has unique requirements, Suzhou Baoshida Rubber offers tailored solutions to meet specific needs. Their customization services ensure that products align perfectly with client specifications, ensuring optimal performance and longevity.

Case Studies: FKM Rubber in Action

Suzhou Baoshida Rubber’s expertise is best showcased through real-world applications. From aerospace components to automotive seals, their FKM products have consistently delivered in terms of quality and performance.

Production Process of FKM Rubber at Suzhou Baoshida Factory

The production of FKM rubber is a meticulous process that requires precision, expertise, and a commitment to quality. At Suzhou Baoshida Rubber, every step of the production journey is carefully monitored to ensure the final product meets the highest standards.

Material Selection and Sourcing

The first step involves selecting the right monomers and additives to produce the desired type of FKM rubber. Depending on the intended application, different formulations might be chosen to achieve specific properties, such as enhanced chemical resistance or improved mechanical strength.

Molding and Shaping

Once the raw materials are mixed and the rubber compound is prepared, it undergoes a molding process. Precision-engineered molds are used to shape the FKM rubber into various products, from seals to gaskets. This step ensures consistency in product dimensions and quality.


Vulcanization is a critical step in the production of FKM rubber. It involves heating the molded rubber in the presence of sulfur or other agents, causing cross-linking between polymer chains. This process enhances the rubber’s mechanical properties and resistance to chemicals and heat.

Quality Control and Testing

Every batch of FKM rubber products undergoes rigorous quality checks. Tests are conducted to assess tensile strength, elongation, hardness, and other vital properties. Additionally, products are tested for their resistance to specific chemicals and temperatures, ensuring they meet the set specifications.

Packaging and Delivery

After passing all quality checks, the FKM rubber products are carefully packaged to prevent contamination and damage during transit. Suzhou Baoshida Rubber ensures timely delivery, catering to the urgent needs of industries worldwide.

Key Considerations for International Buyers

Sourcing FKM rubber, especially from international suppliers, requires careful consideration and due diligence. Here are essential aspects that buyers should keep in mind:

Questions to Ask When Sourcing FKM Rubber from China

  • What is the source of the raw materials used in the production?
  • Are there any certifications or third-party tests that validate the quality of the products?
  • What is the lead time for production and delivery?
  • Are customization options available to meet specific requirements?

Ensuring Quality and Authenticity

It’s crucial to partner with suppliers who prioritize quality control and have a proven track record. Visiting the production facility, if possible, can provide insights into the manufacturing process and quality assurance measures in place.

Understanding Price and Cost Factors

While FKM rubber’s superior properties often justify its higher cost compared to other elastomers, it’s essential to understand the factors influencing its price. Raw material costs, production complexity, and customization requirements can all impact the final product’s cost.


Navigating the complexities of FKM rubber can raise several questions. Here, we address some of the most common queries to provide clarity and insights:

  • What makes FKM rubber superior to other elastomers?
    • FKM rubber boasts exceptional resistance to heat, chemicals, and oxidation, thanks to its unique chemical composition. Its ability to perform under extreme conditions, combined with its longevity, sets it apart from other elastomers.
  • How does Suzhou Baoshida Rubber ensure the quality of its FKM products?
    • Suzhou Baoshida Rubber employs a rigorous quality control process, which includes testing for tensile strength, elongation, hardness, and resistance to specific chemicals and temperatures. Their commitment to quality is further evidenced by their collaborations with partner factories and their adherence to international standards.
  • Can FKM rubber be recycled?
    • While FKM rubber is not as easily recyclable as some other materials due to its cross-linked nature, certain methods, such as pyrolysis, can be used to break it down. However, the primary focus is often on ensuring its longevity to reduce the need for frequent replacements.
  • Is FKM rubber resistant to UV radiation?
    • Yes, one of FKM rubber’s standout properties is its resistance to UV radiation, making it suitable for outdoor applications where it might be exposed to sunlight.
  • How does temperature affect the properties of FKM rubber?
    • FKM rubber can withstand a wide temperature range, from -20°C to 220°C. While it maintains its properties across this range, prolonged exposure to temperatures at the extremes can lead to changes in its elasticity and other mechanical properties.


FKM rubber, with its unparalleled properties, has revolutionized industries, offering solutions that were previously deemed impossible. Its resistance to harsh chemicals, extreme temperatures, and aggressive environments ensures machinery and equipment’s optimal performance. With manufacturers like Suzhou Baoshida Rubber leading the charge, the future of FKM rubber looks promising, promising innovations and advancements that will further enhance its applications.

The Environmental Impact of FKM Rubber

In today’s world, where sustainability and environmental consciousness are paramount, it’s crucial to understand the ecological footprint of materials we use. FKM rubber, with its myriad of benefits, also has environmental considerations.

Production and Carbon Footprint

The production of FKM rubber, like many industrial processes, has associated carbon emissions. However, the longevity and durability of FKM products often mean fewer replacements and reduced waste in the long run. Manufacturers, including Suzhou Baoshida Rubber, are continually seeking ways to optimize production processes to minimize environmental impact.

Waste Management and Disposal

Given FKM rubber’s resistance to breakdown, its disposal poses challenges. Landfilling is not the most environmentally-friendly option, and as mentioned earlier, recycling methods like pyrolysis are being explored. Companies are also looking into more sustainable disposal methods, such as converting waste rubber into energy.

Sustainable Alternatives and Research

Research is ongoing to find sustainable alternatives to traditional FKM rubber without compromising its beneficial properties. Bio-based monomers and green production processes are areas of active exploration.

Collaborating with Suzhou Baoshida Rubber: A Partnership for Success

For businesses seeking a reliable partner in the FKM rubber industry, Suzhou Baoshida Rubber offers more than just high-quality products. Their commitment to innovation, sustainability, and customer satisfaction makes them an ideal choice.

Customized Solutions for Diverse Needs

Every industry has unique challenges, and Suzhou Baoshida Rubber understands this. Their team collaborates closely with clients to develop customized FKM rubber solutions tailored to specific applications.

A Commitment to Sustainability

Suzhou Baoshida Rubber is not just focused on the present but is also looking ahead to the future. Their research and development efforts are geared towards finding sustainable production methods and eco-friendly alternatives, ensuring they remain at the industry’s forefront.

Building Long-Term Relationships

At the heart of Suzhou Baoshida Rubber’s success is their emphasis on building lasting relationships with clients. Their after-sales support, consultation services, and commitment to addressing client feedback set them apart in the industry.

Final Thoughts

FKM rubber, with its exceptional properties, has undeniably transformed industries. Its ability to withstand challenging environments ensures machinery and equipment’s longevity and efficiency. As we look to the future, the collaboration between businesses and manufacturers like Suzhou Baoshida Rubber will be pivotal in driving innovations, ensuring sustainability, and meeting the ever-evolving challenges of the modern world.