An Elastomer is a polymer with the physical property of elasticity. Elastomer is a term derived from elastic polymer, which is often used interchangeably with the term rubber. Each of the monomers which link to form the polymer is usually made of carbon, hydrogen, oxygen and or silicon. Elastomers are usually thermosets requiring a cure process of rubber involving heat and the addition of sulfur or other equivalent curatives. In addition elastomers might also be thermoplastic.