FKM / Viton B Rubber Sheet
Viton A and Viton B are both types of fluoroelastomers, also known as FKM (fluoroelastomeric) materials. These materials are renowned for their excellent resistance to heat, chemicals, and a wide range of fluids. While Viton A and Viton B share similar characteristics and are part of the Viton family, they do possess some key differences that set them apart.
Composition: Viton A is composed of a copolymer of vinylidene fluoride (VF2) and hexafluoropropylene (HFP), while Viton B is made from a terpolymer of vinylidene fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). The addition of TFE in Viton B provides enhanced chemical resistance compared to Viton A.
Temperature Resistance: Viton A has a maximum continuous service temperature of around 200°C (392°F), while Viton B can withstand higher temperatures with a maximum continuous service temperature of approximately 250°C (482°F). This makes Viton B more suitable for applications where higher heat resistance is required.
Fluid Resistance: Both Viton A and Viton B exhibit excellent resistance to a broad range of chemicals, oils, fuels, and solvents. However, Viton B offers improved resistance to certain aggressive chemicals, such as acids, amines, and steam, due to the presence of TFE in its composition. It also exhibits better resistance to compression set and permeation.
Mechanical Properties: In terms of mechanical properties, Viton B generally provides slightly better tensile strength and tear resistance compared to Viton A. However, both materials are known for their excellent resilience and durability, making them suitable for demanding sealing and gasketing applications.
Cost: Viton B is typically more expensive than Viton A due to its improved chemical resistance and higher temperature capabilities.
Ultimately, the choice between Viton A and Viton B depends on the specific requirements of the application. Viton A is commonly used in a wide range of industries for sealing applications that don't require extremely high temperatures or exceptional chemical resistance. Viton B, on the other hand, is preferred when enhanced chemical resistance and higher temperature resistance are critical factors. It is commonly employed in industries such as chemical processing, oil and gas, aerospace, and automotive applications.