The contents of this section include:

(1) High Bond Energy
The polymeric molecular  structure of  silicone rubbers has a main chain  formed of  siloxane linkages  Si-O. The bond  energy  of the siloxane linkage Si-O is 106.0 kcal/mole which is much higher than the bond  energy 84.9  kcal/mole of the carbon-to-carbon bond C-C.
This  difference  in the bond  energies  explain  the outstanding  stability  of silicone  rubbers in  comparison with  other organic rubbers . In general , silicone rubber  have  much  better  heat resistance , electrical insulation , chemical stability, etc.. than organic rubber.

(2) Low intermolecular force and strong coil-forming

Dimenthylpolysiloxane, a typical polymeric constituent of silicone rubbers, has a helical of coiled molecular configuration with a small intermolecular force so that it has high resilience. large compressibility and excellent cold resistance . Furthermore, the outwardly directed methyl groups are able to rotate freely resulting in the unique surface properties of silicones such as water repellence and surface-releasability.