Silicone is also known as polysiloxanes, they are polymers of inert, synthetic compounds of siloxane. Siloxane is a repetition of silicon atoms and oxygen.
Silicones are heat-resistant and has rubber-like properties. But it is not a rubber like the TPE is. We can find this material widespread in our daily life (cooking, lubricant, medicine, etc…).
Nowadays the term “Silicone Sex dolls” refers to all kind of solid dolls, as well the TPEs ones, this can lead to confusion where some shops are using the terme silicone sex doll to promote TPE dolls, or even worst the term Silicone TPEs dolls (only for marketing use).