Silicone:
Silicones are high-molecular compounds based on a three-dimensional structure of alternating silicon and oxygen atoms. Typically heat-resistant, nonstick, and rubberlike, they are frequently used in cookware, medical applications, sealants, lubricants, and insulation. Silicones are polymers that include silicon together with carbon, hydrogen, oxygen, and sometimes other chemical elements.

Rubber:
A general term used to describe elastic materials that can be vulcanized and finished into thermosetting elastomers, such as natural or synthetic rubbers, neoprene, Hypalon, butyl rubber, & others