Fluoresilicone combines the good properties of high and low temperature of silicone with limited resistance to fuel and oil. In fact, it is a plastic because of the lack of hydrocarbon compounds. Fluoresilicone is available in all different RAL colours, as well as transparent. The colouring of fluorosilicones does not affect the mechanical properties.
The maximum temperature resistance goes up to 230ºC and the material is very plastic, from hard (80 Shore-A) to soft (40 Shore-A).
Fluorosilicones offer a much wider range of temperatures under freezing temperatures than Fluorocarbon rubbers. The most important applications of fluorosilicon seals are cooling & freezing systems, arctic conditions, but also in fuel systems at temperatures up to + 177 ° C (+ 350 ° F) and in applications where the dry heat resistance of silicone O-rings is required.Fluorine silicone seals can also be exposed to oil based on petroleum and / or hydrocarbon fuels. In contrast to silicone, fluorosilicones are resistant to silicone oil & grease.
For applications at low temperatures, fluorosilicone O-rings are suitable up to -73 ° C (-100 ° F). These materials are only recommended for static applications due to the relatively low tear strength, high friction and limited abrasion resistance.
Fluoresilicones with high tear strength are also available. Some of these compounds exhibit improved resistance to compression.
Many fluorosilicones have a higher than normal shrinkage during the vulcanisation process, so that moulds for products in fluorosilicones in size often differ from moulds for other elastomers.