Fluoroelastomer (Fluoroelastomer) is a high performance elastomer with excellent chemical, heat and oil resistance. It is widely used in aerospace, automotive, chemical and medical fields. fluoroelastomer mainly includes peroxyfluoroelastomer (HFP-based fluoroelastomer) and ordinary fluoroelastomer (VDF-based fluoroelastomer). In this paper, the differences between these two fluororubbers will be discussed in detail, including their chemical structure, physical properties, performance characteristics and application fields.
1. Chemical structure
Peroxyfluoro rubber
Peroxyfluororubber, also known as hexafluoropropylene (HFP) fluororubber, its main chemical structure units are hexafluoropropylene (HFP) and vinylidene fluoride (VDF).
Ordinary fluorine rubber
Common fluororubber, also known as vinylidene fluoride (VDF) fluororubber, its main chemical structure units are vinylidene fluoride (VDF) and tetrafluoroethylene (TFE).
2. Physical properties
Peroxyfluoro rubber
Density: The density of peroxyfluoro rubber is higher, usually between 1.8-2.0 g/cm³.
Hardness: The hardness is high, usually between Shore hardness A 70-90.
Tensile strength: Tensile strength is high, usually between 10-20 MPa.
Heat resistance: Peroxyfluoro rubber has excellent high temperature resistance and can be used for a long time in an environment of up to 200°C.
Ordinary fluorine rubber
Density: The density of ordinary fluororubbers is low, usually between 1.7-1.9 g/cm³.
Hardness: The hardness is low, usually between Shore hardness A 60-80.
Tensile strength: Tensile strength is low, usually between 5-15 MPa.
Heat resistance: The heat resistance of ordinary fluororubber is slightly lower than that of peroxyfluororubber, and it can be used in an environment of up to 150°C for a long time.
3. Performance characteristics
Peroxyfluoro rubber
Chemical resistance: Peroxyfluoro rubber has excellent chemical resistance and can resist the attack of most chemicals, including acids, bases and organic solvents.
Oil resistance: Excellent oil resistance and fuel resistance, suitable for oil and fuel environments.
Weather resistance: It has good weather resistance in ultraviolet and ozone environments.
Ordinary fluorine rubber
Chemical resistance: The chemical resistance of ordinary fluoro rubber is also very good, but slightly worse than peroxyfluoro rubber.
Oil resistance: oil resistance and fuel resistance is better, but not as good as peroxyfluoro rubber.
Weather resistance: good weather resistance, but slightly worse than peroxyfluoro rubber.
4. Application field
Peroxyfluoro rubber
Aerospace: Due to its excellent high temperature and chemical resistance, peroxyfluoro rubber is widely used in the aerospace field of seals and gaskets.
Automotive industry: For the manufacture of high-performance engine seals and fuel system components.
Chemical: Used to manufacture corrosion-resistant pipe seals and valves.
Ordinary fluorine rubber
Automotive industry: Used in the manufacture of seals, gaskets and hoses, especially in fuel systems and lubrication systems.
Industrial equipment: For the manufacture of oil and chemical resistant seals and rubber products.
Electronic appliances: For the manufacture of high temperature and chemical resistant cables and connectors.
conclusion
There are significant differences in chemical structure, physical properties, performance characteristics and application fields between peroxyfluororubbers and ordinary fluororubbers. Peroxyfluororubbers play an important role in high-end applications with their higher heat, chemical and oil resistance, while ordinary fluororubbers play a role in a wide range of applications with their cost effectiveness and versatility. Understanding the difference between the two types of fluororubbers helps to select the most suitable material for practical applications to meet specific needs.
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