Fluorosilicone rubber and silicone rubber are both elastomers with distinct properties suited for different applications. 
Fluorosilicone rubber is a modified version of silicone rubber, incorporating fluorinated side chains. This modification enhances its chemical resistance, particularly against fuels, oils, and solvents, making it ideal for aerospace, automotive, and industrial applications where exposure to harsh chemicals is common. It maintains its flexibility and performance over a wide temperature range, typically from -60°C to 200°C, and offers excellent resistance to ozone, UV, and weathering.
Silicone rubber, on the other hand, is known for its superior thermal stability, maintaining its properties from -60°C to 230°C or higher. It is highly flexible, biocompatible, and resistant to environmental factors like ozone and UV radiation. Silicone rubber is widely used in medical, food, and consumer goods industries due to its non-reactive and non-toxic nature.
While both materials share some similarities, such as thermal stability and environmental resistance, the key difference lies in their chemical resistance. Fluorosilicone is preferred in environments with aggressive chemicals, whereas silicone is chosen for applications requiring higher thermal stability and biocompatibility. Additionally, fluorosilicone is generally more expensive than silicone due to its specialized properties.
In summary, the choice between fluorosilicone and silicone rubber depends on the specific requirements of the application, particularly concerning chemical exposure and temperature range.