As rubber applications continue to evolve and require higher-temperature performance and higher resistance against fuels and oils, many industries - including automotive, aviation, and oil and gas - are looking beyond traditional materials for solutions. Applications include everything from turbocharger hose lining to blowback preventer seals to gaskets for airplane hydraulic systems. FKM (fluorocarbon rubber) and FVMQ (fluorosilicone rubber) have historically been used in these applications, with FKM being used for many of the applications requiring the highest-temperature resistance and FVMQ being used for temperatures up to 220°C. Recent advancements in FVMQ technology have extended the upper service-temperature performance up to 240°C with peak temperatures to 250°C. This advancement, in addition to greater property stability over a wide temperature range compared to FKM, now allows FVMQ to be used in higher-temperature applications. Additionally, FVMQ provides 25% lower density, allowing for better weight savings and lower material usage. This paper discusses the technology advancements in FVMQ, showing comparisons to traditional FVMQ and FKM materials. Comparisons will be made to newly developed FVMQ materials with higher heat stability, showing test results for physical properties measured at elevated temperature (up to 200°C), aging performance in automotive fluids (fuels and oils), adhesion performance to VMQ (as it relates to co-extrusion application), and acid-gas resistance. This paper will demonstrate how FVMQ elastomers can be designed to precisely meet specific application requirements and highlight performance attributes in which FVMQ provides advantages over FKM.
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