ABSTRACT
To extend the service life of vulcanized rubber goods, it is very important to protect them from oxygen, ozone, light, heat, and flex fatigue. Most natural and synthetic rubbers containing unsaturated backbones-natural rubber (NR), styrene butadiene rubber (SBR), polybutadiene rubber (BR), and nitrile rubber (NBR), for example-must be protected against oxygen and ozone. Usually, internal components that are not exposed to atmosphere require only antioxidants. However, external components that are exposed to the environment require both antiozonants and antioxidants.
