These pigments are slightly more difficult to produce than ordinary monoazo pigments and are available in yellow, orange, red, violet, magenta, brown and purple.

The selection of antioxidant should be based on the type and model of rubber and plastic materials, processing equipment and technological conditions, the variety and amount of other chemical additives, the use of the product environment and time limit and other factors.

In each stage of the polymer life cycle, that is, its survival, storage, processing, use process, will be due to its own or external factors and oxidation, resulting in the degradation or loss of polymer and its products properties. This is also known as the aging of polymer materials. Adding antioxidant is an effective means to delay the aging of materials.