Elastomers are polymers that have both viscosity and elasticity, and are therefore known as viscoelastic materials. They are characterized by weak intermolecular forces, low Youngs modulus, and high failure strain compared to other materials. Elastomers are usually thermosets, meaning they require vulcanization, but they may also be thermoplastic. The long polymer chains cross-link during curing, which gives them their unique properties.

Elastomers are used in a variety of applications, including seals, adhesives, and molded flexible parts. They are also used in the automotive industry, in the manufacture of medical tubes and prostheses, in the textile industry for manufacturing elastic clothing, and in the manufacture of industrial belts and wheels of vehicles.

Some examples of elastomers include natural rubber, polyurethanes, polybutadiene, silicone, and neoprene. Elastomers are highly elastic and viscous polymers formed by long molecules in the form of long carbon, hydrogen, oxygen, or silicon chains, whose chemical structures have intermolecular cross-links and are capable of recovering their original shape after being stretched.

The properties of elastomers include elasticity, viscosity, low stress deformation, and the ability to regain their original shape after being stretched. They also have good chemical resistance, thermal resistance, and are flexible and durable. However, they can suffer from hardening, cracking, and splitting if pushed beyond their ageing resistance.

In summary, elastomers are a type of polymer with unique properties that make them useful in a variety of applications. They are characterized by their elasticity, viscosity, and ability to regain their original shape after being stretched.