Fluorosilicone Rubber
Fluorosilicones can operate over a very wide range of temperatures (-60°C to +200°C) and their resistance to di-ester lubricants, ozone and weathering is excellent. They have good electrical strength and moderate oil resistance.
However, they are particularly expensive rubbers and unsatisfactory for use with phosphate esters. Like Silicone rubbers, their physical properties and permeability to gases are poor.
Typical applications include aerospace fuel system components, diaphragms, gaskets, hose lining, seals and O-rings.