18 Nov What is the Difference Between FKM and Viton® Cord?
At I.B. Moore Manufacturing, we don’t expect our clients to know what FKM and Viton® cords are right off the bat. Those terms might initially sound complicated, but both are types of synthetic rubber. What’s important to understand is that they have distinct characteristics that increase suitability for different applications. Once you learn about them, you can make informed decisions for your company.
But first, let’s step back and explain what cords stock is.
The Basics of Cord Stock
Cord stock is also called rubber cord stock and O-Ring stock. It’s made from rubber or elastomer material and produced in long lengths. We use cord stock to manufacture seals, gaskets, and O-rings. It’s available in different materials, like FKM and Viton®.
We cut the cord stock to specific lengths and in certain ways to meet client requirements. Then, we bond the ends through adhesion, vulcanization, or splicing.
The Relationship Between FKM and Viton®
FKM stands for fluorocarbon rubber, a synthetic elastomer known for its excellent heat, oil, and chemical resistance. We recommend it for applications where durability is essential. Viton® is a specific brand of FKM produced by DuPont.
Know this: While all Viton® is FKM, not all FKM is Viton®. The distinction lies in the specific formulations and additives that Viton® contains. That can improve its performance in particular environments.
FKM and Viton®: Key Differences in Composition
FKM may include different fluoropolymer blends, while Viton® uses a proprietary mix to offer superior performance characteristics. That includes better flexibility, lower compression, and improved temperature stability. These differences can affect how each material performs in various settings.
Properties of FKM and Viton®
FKM and Viton® have similar qualities, but there are distinctions:
- Temperature Resistance: FKM can generally handle temperatures ranging from -20°F to 400°F. Certain Viton® grades can tolerate even higher ones.
- Chemical Resistance: Both materials offer excellent resistance to chemicals, but companies may prefer Viton® for use with harsh solvents or acids.
- Flexibility and Compression Set: While both materials are flexible, Viton® typically has a lower compression set. That means it retains its shape and effectiveness better over time, even under pressure.
- Cost: Viton® tends to be more expensive than standard FKM due to its specialized manufacturing process and performance properties.
We recommend weighing the costs against the performance benefits when choosing between FKM and Viton®.
FKM and Viton® Applications and Uses
FKM and Viton® are applicable in various industries, including automotive and aerospace. Here are some common usages for each:
FKM
- Pump and valve seals
- Seals and gaskets in fuel systems
- O-rings for hydraulic applications
- Hoses and tubing in industrial machinery
Viton®
- High-performance O-rings seals in aerospace components
- Gaskets in automotive engines
- Parts exposed to extreme temperatures or aggressive chemicals
- Transporting oil and gas in extreme conditions
How Can I Decide Whether to Use FKM or Viton®?
The I.B. Moore Manufacturing team takes these steps when designing projects that might use FKM or Viton®:
- Identify the Environment: We determine the operating conditions, such as temperature ranges and chemical exposure.
- Think About Durability: If a client project requires a long-lasting solution, Viton® might be best.
- Test the Materials: We conduct tests to see how the materials hold up under specific conditions. That provides valuable insights.
Don’t hesitate to seek advice from professionals who frequently work with these materials. I.B. Moore Manufacturing can provide recommendations based on your real-world applications.
What Other Kind of Cord Stock is Available?
Other kinds of cord stock material include:
- Natural Rubber: Made from latex, natural rubber is resilient and flexible. It’s fine for general-purpose applications but has limited chemical resistance.
- Neoprene: This synthetic rubber resists oil, weather, and ozone. It’s ideal for seals and gaskets exposed to harsh environments.
- EPDM: Ethylene propylene diene monomer (EPDM) cord is highly resistant to heat, aging, and weathering. Two applications for EPDM are roofing and automotive weather seals.
- Silicone: This flexible material resists high temperatures. It’s suited for food processing, medical devices, and applications in extremely high- and low-temperature environments.
- Nitrile: Also known as Buna-N, this cord stock has excellent oil resistance.
We’ll Help You Select the Best Cord Stock for Your Project
Each type of cord stock meets specific performance requirements, so choosing the best materials is critical. Whether you’re looking at FKM, Viton®, or another stock, don’t hesitate to reach out to us for assistance. Contact us in Lexington, KY, for nationwide service.