Are FKM and Viton the same?

Dec. 05, 2023

The world of synthetic rubbers is vast and diverse, with numerous types available for different applications. Among these, two terms are often used interchangeably: FKM and Viton. But are they truly the same, or is there a difference between them? Let's delve into this topic and explore the intricacies of FKM and Viton.

1. FKM and Viton: Understanding the Basics.

Are FKM and Viton the same?

FKM, also known as Fluoroelastomer, is a type of synthetic rubber that contains fluorine atoms. It exhibits excellent resistance to heat, chemicals, and oils, making it a popular choice in various industries, including automotive, aerospace, and chemical processing. Viton, on the other hand, is a brand name for FKM developed by the chemical company DuPont. It is widely recognized and respected in the industry due to its high-quality standards and reliability.

2. Composition and Properties.

Both FKM and Viton share the same chemical composition, consisting mainly of vinylidene fluoride (VF2) and hexafluoropropylene (HFP). This combination allows for exceptional resistance to extreme temperatures and various chemicals, including acids, bases, fuels, and solvents. FKM/Viton also displays excellent compression set, low gas permeability, and outstanding mechanical properties, such as tensile strength and tear resistance. Therefore, in terms of composition and properties, FKM and Viton are virtually identical.

3. Manufacturing Standards.

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While FKM and Viton have the same chemical backbone, it is important to note that only products bearing the Viton brand are manufactured according to DuPont's rigorous standards. This ensures strict quality control and consistency in terms of performance. However, many other manufacturers also produce FKM products that meet or exceed industry standards. These FKM alternatives are often referred to as generic FKM or simply FKM. So, if you require a product with certified quality, it is advisable to opt for genuine Viton.

4. Availability and Pricing.

Considering the widespread popularity of FKM and Viton, they are readily available from various suppliers. Viton products, due to their brand recognition and stringent manufacturing standards, may come at a higher price compared to generic FKM. However, it is worth noting that generic FKM can also offer excellent performance and value for certain applications, especially where strict quality control is not a primary concern.

5. Applications and Compatibility.

Both FKM and Viton exhibit excellent compatibility with a wide range of chemicals and fluids, making them suitable for demanding applications such as oil seals, gaskets, O-rings, and other sealing components. They are particularly chosen when resistance to extreme temperatures, aggressive chemicals, and fuels is vital. It is crucial to consider the specific application requirements when choosing between FKM and Viton, as well as consulting with experts or manufacturers to ensure the best match for your needs.

In conclusion, while FKM and Viton are often used interchangeably, they are technically the same in terms of chemical composition and properties. The key difference lies in the manufacturing standards, with Viton being produced according to DuPont's stringent guidelines. However, generic FKM alternatives can also offer outstanding performance and value, depending on the application requirements. Whether you choose Viton or generic FKM, these synthetic rubbers provide remarkable resistance to heat, chemicals, and oils, serving numerous industries worldwide.

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