Fluorosilicone
FVMQ (Fluorosilicone) combines the good high and low temperature properties of silicone with limited fuel and oil resistance. Fluorosilicone offers a much wider operating temperature range than Fluorocarbon rubbers.
FVMQ Applications
Primary applications of fluorosilicone O-rings are in fuel systems at temperatures up to +177°C (+350°F) and in applications where the resistance to dry heat is required.
Fluorosilicone O-rings can also be exposed to petroleum-based oil and/or hydrocarbon fuels. However, in some fuels and oils, the high temperature limit in the fluid list is more conservative because fluid temperatures approaching 200°C can degrade the liquid, producing acids that attack fluorosilicone O-rings. For low-temperature applications, fluorosilicone O-rings close at temperatures as low as -73°C (-100°F).
Due to the relatively low tear strength, high friction and limited wear resistance of these materials, they are generally only recommended for static applications. High tear strength fluorosilicone is also available. Some of these compounds show improved resistance to compression. Many fluorosilicone compounds have a higher than normal shrinkage rate, so production molds for fluorosilicone products are often different from molds for nitrile.
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