Rubber is water repellent and resistant to alkalies and weak acids. Rubber's elasticity, toughness, impermeability, adhesiveness, and electrical resistance make it useful as an adhesive, a coating composition, a fiber, a molding compound, and an electrical insulator.
Both these compounds are polymer materials. They have unique properties depending on their chemical structures. The main difference between plastic and rubber is that plastic is essentially a synthetic polymer whereas rubber can be found as a natural polymer or can be produced as a synthetic polymer.