Silicone SI and Fluorosilicone FSI Rubbers

Silicone rubbers, also known as polysiloxanes, are a series of compoimds whose polymer structure consists of silicon and oxygen atoms rather than the carbon structures of most other elastomers. The silicones are derivatives of silica, Si02 or 0=Si=0. When the atoms are combined so that the double linkages are broken and methyl groups enter the linkages, silicone rubber is produced  

Silicone and fluorosilicone rubbers display excellent resistance to sun, weathering, and ozone. Their properties are virtually unaffected by longterm exposure. 

The fluorosilicone rubbers have better chemical resistance than the silicone rubbers. They have excellent resistance to aliphatic hydrocarbons and good resistance to aromatic hydrocarbons, oil and gasoline, animal and vegetable oils, dilute acids and alkalies, and alcohols and fair resistance to concentrated alkalies. 

Refer to Table 5.21 for the compatibility of silicone rubbers with selected 

Compatibility of Silicone Rubbers with Selected Corrodents 

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