Table of Contents:
- Beginning
- A Short Introduction to the Two Materials
- Why Should You Compare These Two Materials?
- What is VMQ/SILICONE?
- Composition and Structure
- Important Parts
- Uses
- What is FVMQ?
- Composition and Structure
- Important Parts
- Uses
- Comparing Performance: VMQ and FVMQ
- Resistance to heat
- Stability and Resistance to Chemicals
- Mechanical Properties: Hardness, elasticity, and resistance to wear
- Resistance to Aging
- Analysis of the application scenario
- How well it works in different situations
- Case studies that show how well the material works and what its benefits are
- Price
- The cost of the two materials
- Suggestions for Choosing
- Suggestions Based on What the Application Needs
- Case studies and pictures to help readers choose the best option
- The End
- Talk about how great Jingteng Precision’s research and development team and production department are. They can help customers with their problems, come up with solutions that fit their needs, and do 100% inspections for the customer’s benefit.
1. Introduction
Choosing the right materials is very important for how well a product works and what it can be used for in today’s industrial world. Different types of rubber materials have different advantages, especially when they need to be resistant or have good mechanical performance and then need to be maintained. VMQ and FVMQ are two common types of silicone-based rubbers that have very different chemical structures, performance, and uses. This article will go into detail about the main differences between VMQ and FVMQ, which will help you understand their pros and cons and when to use each one.
2. What is VMQ/SILICONE?
1. Composition and Structure:
VMQ, is also known as silicone rubber, is an elastomer composed of a polysiloxane . Its basic chemical structure consists of alternating silicon (Si) and oxygen (O) atoms in the backbone, with organic side groups like methyl and vinyl attached to the silicon atoms.
This structure gains silicone rubber excellent thermal stability and chemical inertness, allowing it to withstand elasticity at extreme temperatures.
2. Key Features:
VMQ silicone rubber is renowned for its outstanding high and low-temperature resistance, remaining stable across a temperature range from -60°C to 225°C, with special formulations that can be used between -100°C and 300°C.
Additionally, silicone rubber has excellent electrical insulation properties and stability against heat oxidation and ozone. It is non-toxic and environmentally friendly.
However, silicone rubber has relatively low mechanical strength, poor oil, solvent, and acid-alkali resistance, and a more complex vulcanization process.
3. When you can use apps:
VMQ is used a lot in both hot and cold situations because it has special properties. For example, it is used in hoses, seals, and insulation layers for cables that have to work in hot weather.
It is very common in the food and medical fields because it is safe and doesn’t smell. For example, it is used to seal medical devices, baby products, and food.
Silicone rubber is the best material for anything that needs to be safe, flexible, and stable when it’s hot.
3. What does the acronym FVMQ stand for?
1. Structure and Composition
FVMQ is a unique elastomer with a backbone made of silicon and oxygen (Si-O) and trifluoropropyl groups on the side chain. The process of polymerizing FVMQ is the same as that of dimethyl silicone rubber: it uses a cyclic siloxane ring-opening polymerization process. Fluorosilicone rubber is resistant to heat, oil, and solvents because of the way it is made. This gives it special benefits in very bad weather.
2. Key Features:
FVMQ is very resistant to oils and solvents, especially when it comes to staying stable at normal and high temperatures when exposed to petroleum-based fuels, lubricants, hydraulic oils, and some synthetic oils. It can work in temperatures from -60°C to 200°C for a long time, and even longer when it is in oil, up to 180°C. It doesn’t resist heat and drugs as well as regular fluororubber, but its special silicon-oxygen bond and fluorine side chain structure make it work well in fuel oil environments. It doesn’t work well with ethanol gasoline, it isn’t very strong mechanically, and it costs more.
3. Applications:
FVMQ is widely in the automotive and aerospace industries. The aerospace industry needs to withstand low temperatures, oil, and acids. Examples include fuel oil seals on planes, integral tank seals, and sensor materials. FVMQ is a common material for seals, oil seals, diaphragms, ducts, valves, and other parts of cars and trucks. It’s especially good for making seals for doors and windows and materials for sensors. FVMQ is great in performance which stay stable in extreme conditions because it works better than other materials.
4. Performance Comparison: VMQ vs FVMQ
1. Temperature Resistance:
– FVMQ: Its Maximum operating temperature is 200°C, low-temperature resistance down to -80°C.
– VMQ: Its Maximum operating temperature is 250°C, low-temperature resistance ranging from -70°C to -120°C.
VMQ performs better at high temperatures and with similar low temperatures performance, But VMQ has a broader low-temperature range.
2. Stability and Chemical Resistance:
– FVMQ: It is very resistant to fuels, oils, oxygen, and chemical solvents, especially fuel oils and chemical solvents.
– VMQ: It doesn’t resist chemicals and oxygen as well as FVMQ.
When it comes to chemical solvents, fuel oil, and combustion, FVMQ is better than VMQ at staying stable.
3. Mechanical Properties: Elasticity, Hardness, and Abrasion Resistance:
- FVMQ: It has a hardness range of 50 to 80 Shore A and good elasticity, but it doesn’t hold up well to wear and tear.
- VMQ: It is also very elastic, with a hardness range of 30 to 90 Shore A, and it is a little less resistant to abrasion.
VMQ has a wider range of hardness options than the other material, but both are equally elastic. Both are moderately resistant to wear and tear, but FVMQ is a little better than VMQ.
4. Aging Resistance:
– FVMQ: Has great resistance to aging, ozone, and oxygen.
– VMQ: It also resists aging well, especially when exposed to heat, oxygen, and ozone.
Both materials are very resistant to aging, it is good for use where need to be exposed to harsh conditions for a long time.
5. Application Scenario Analysis
1. Performance in Different Applications:
VMQ and FVMQ each have special advantages in their respective fields of application. VMQ is widely used in scenarios requiring long-term high-temperature, low-temperature, and good electrical insulation, such as insulation layers for wires and cables, seals, and food-grade and medical-grade seals.
Due to its non-toxic and odorless properties, VMQ is also often used in applications with food and the human body.
FVMQ, on the other hand, is particularly suitable for sealing and protective components in extreme environments, especially in the aerospace and automotive industries. It can maintain elasticity and stability for long periods when exposed to fuel oils, lubricants, hydraulic oils, and other oil products, making it ideal for aircraft fuel systems, oil tank seals, and automotive oil seals, diaphragms, etc.
2. Case Studies:
– VMQ :
– Food and Medical Equipment Industry:
In food processing equipment, VMQ seals are widely used due to their high-temperature resistance, non-toxicity, and odorless properties. They can work long-term in steam environments without affecting the taste or safety of the food. For example, in high-temperature baking equipment, VMQ seals can work for extended periods at 200°C without significant performance degradation.
– Medical Equipment:
In medical devices like respiratory masks and catheters, VMQ is the material of choice due to its biocompatibility and resistance to disinfection. It can withstand repeated high-temperature disinfection treatments while maintaining softness and sealing properties.
– Electronics Industry:
In the electronics industry, VMQ is used to make insulating materials, such as high-temperature cable sheaths. Its heat resistance and excellent electrical insulation make it perform well in high-temperature electrical environments. For instance, the VMQ insulation layer in electrical equipment can operate at 250°C, ensuring the normal operation of the equipment.
– FVMQ (Fluorosilicone Rubber):
– Aerospace Industry:
FVMQ is extensively used in the aerospace industry. For example, in an aircraft’s fuel system, FVMQ seals can maintain good sealing performance under extreme temperature variations (-60°C to 200°C), resist fuel oil corrosion, and prevent fuel leakage. A typical case is a certain model of passenger aircraft fuel system, where FVMQ seals have maintained excellent elasticity and oil resistance after long-term use, avoiding material aging and fuel leakage problems that could occur with conventional rubber.
– Automotive Industry:
In automotive manufacturing, FVMQ is used to make various critical seals, such as engine oil seals and fuel system seals. FVMQ can effectively resist the high temperatures and chemical erosion of engine lubricating oil, extending the lifespan of seals. In high-performance racing cars, FVMQ is often used as an oil seal material due to its oil resistance and high-temperature resistance, ensuring the normal
operation of the engine.
– Oil and Chemical Industry:
In the oil and chemical industries, FVMQ is used in oil pipelines and chemical containers that require sealing and protective components to resist chemical corrosion and maintain stable performance at high temperatures. For example, in a chemical plant’s reactor system, FVMQ seals provide excellent sealing performance and chemical resistance, maintaining the system’s tightness during chemical reactions and avoiding safety issues such as leaks.
6. Cost
1. Cost Comparison:
– VMQ: VMQ is generally more cost-effective and is available in various formulations to suit different budgets and performance requirements.
– FVMQ: Due to its specialized performance characteristics, FVMQ is typically more expensive, with costs driven by its unique resistance properties and use in high-performance applications.
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7. Selection Recommendations
1. Recommendations Based on Application Needs:
– Choose VMQ if:
– You require high-temperature resistance in applications like electrical insulation or food-grade materials.
– Cost is a significant factor, and the environment doesn’t demand high chemical or oil resistance.
– Choose FVMQ if:
– Your application involves exposure to harsh chemicals, fuels, or extreme temperatures.
– You need a material that can maintain performance in aerospace or automotive environments.
8. Conclusion
Jingteng Seiko—a leader in the fluid control industry—offers tailored solutions for automotive, medical, food, and other sectors. We uphold the highest standards in material selection and precision craftsmanship, ensuring every product undergoes rigorous testing before delivery. With a commitment to 100% reliability, Jingteng Precision ensures your equipment operates efficiently and effectively.
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