How to choose the right grade of fluorosilicone FVMQ?

When it comes to the world of high - performance elastomers, fluorosilicone FVMQ stands out for its unique combination of properties. As a leading fluorosilicone FVMQ supplier, I understand the challenges customers face in choosing the right grade of this remarkable material. In this blog, I will share some key considerations to help you make an informed decision.

Understanding Fluorosilicone FVMQ

Fluorosilicone FVMQ is a specialty elastomer that combines the excellent low - temperature flexibility of silicone rubber with the chemical resistance and fuel resistance of fluorocarbon rubber. It is widely used in applications where exposure to fuels, oils, solvents, and high - temperature environments is common, such as automotive, aerospace, and chemical processing industries.

The performance of fluorosilicone FVMQ is determined by several factors, including its chemical composition, molecular weight, and the type of cross - linking system used during vulcanization. Different grades of FVMQ are formulated to meet specific performance requirements, so it's crucial to understand your application needs before making a selection.

Factors to Consider When Choosing the Right Grade

1. Chemical Resistance

One of the primary reasons for choosing fluorosilicone FVMQ is its resistance to a wide range of chemicals. However, not all grades offer the same level of chemical resistance. If your application involves contact with aggressive chemicals, such as fuels, oils, or solvents, you need to select a grade that can withstand these substances without significant degradation.

For example, some grades of FVMQ are specifically designed for use in contact with aviation fuels. These grades have been tested and proven to maintain their physical properties even after prolonged exposure to fuel. On the other hand, if your application involves exposure to milder chemicals, you may be able to choose a more cost - effective grade with a lower level of chemical resistance.

2. Temperature Range

Fluorosilicone FVMQ has excellent temperature stability, but different grades have different temperature limits. Consider the operating temperature range of your application. Some grades can withstand extremely low temperatures, making them suitable for applications in cold environments, such as aerospace components that operate at high altitudes. Other grades are better suited for high - temperature applications, such as engine gaskets in automotive engines.

The ability of FVMQ to maintain its flexibility and mechanical properties over a wide temperature range is a key advantage. However, you need to ensure that the grade you choose can meet the specific temperature requirements of your application.

3. Mechanical Properties

The mechanical properties of fluorosilicone FVMQ, such as hardness, tensile strength, and elongation at break, are also important considerations. The hardness of FVMQ is typically measured on the Shore A scale. Softer grades (lower Shore A values) are more flexible and are suitable for applications where a tight seal or cushioning is required. Harder grades (higher Shore A values) offer better resistance to abrasion and deformation and are often used in applications where the material needs to withstand high pressures.

Tensile strength and elongation at break indicate the ability of the material to withstand stretching and tearing. For applications where the material will be subjected to high stresses, such as in dynamic seals, you need to choose a grade with high tensile strength and good elongation properties.

4. Compression Set

Compression set is the ability of a rubber material to recover its original shape after being compressed. In applications where a seal is required, such as in gaskets and O - rings, a low compression set is essential. A material with a high compression set will lose its sealing ability over time, leading to leaks. Different grades of FVMQ have different compression set values, so it's important to choose a grade that can maintain its sealing performance under the specific compression conditions of your application.

5. Vulcanization System

The vulcanization system used in the production of fluorosilicone FVMQ can also affect its properties. There are two main types of vulcanization systems: bisphenol vulcanization and peroxy vulcanization.

Bisphenol Vulcanized Fluororubber Raw Rubber offers good mechanical properties, chemical resistance, and heat resistance. It is a popular choice for many applications. On the other hand, Peroxy Vulcanized Fluororubber Raw Rubber provides better resistance to compression set and is often used in applications where long - term sealing performance is critical.

Application - Specific Considerations

Automotive Applications

In the automotive industry, fluorosilicone FVMQ is used in a variety of applications, including gaskets, seals, and O - rings. For engine gaskets, a grade with high temperature resistance and good compression set properties is required to ensure a reliable seal under the high - temperature and high - pressure conditions inside the engine. For fuel system seals, chemical resistance to fuels and oils is of utmost importance.

Aerospace Applications

Aerospace applications demand the highest level of performance from materials. Fluorosilicone FVMQ used in aerospace components must be able to withstand extreme temperature variations, high altitudes, and exposure to aviation fuels. Grades with excellent low - temperature flexibility and high chemical resistance are typically chosen for these applications.

Chemical Processing Applications

In chemical processing plants, fluorosilicone FVMQ is used to seal pipes, valves, and other equipment. The grade selected must be able to resist the specific chemicals used in the process. Additionally, good mechanical properties and compression set resistance are required to ensure long - term sealing performance.

Making the Right Choice

Choosing the right grade of fluorosilicone FVMQ requires a thorough understanding of your application requirements. It's advisable to consult with a technical expert or our team at the supplier. We have the knowledge and experience to help you select the most suitable grade based on your specific needs.

We offer a wide range of fluorosilicone FVMQ grades, each carefully formulated to meet different performance requirements. Our technical support team can provide detailed information about the properties of each grade and assist you in conducting compatibility tests if necessary.

If you are in the process of selecting a fluorosilicone FVMQ grade for your application, we encourage you to reach out to us for a consultation. We can help you navigate the complex world of elastomers and ensure that you choose the right material for your project. Whether you need a grade with high chemical resistance, excellent temperature stability, or specific mechanical properties, we have the solution for you. Contact us today to start the conversation and explore how our fluorosilicone FVMQ products can meet your needs.

References

• "Handbook of Elastomers", Second Edition, Edited by A. K. Bhowmick and H. L. Stephens
• "Rubber Technology: Compounding, Vulcanization, and Testing", Third Edition, By Werner Hofmann