Rubber and its products in the long-term storage and use of the process, due to heat, oxygen, ozone, variable price metal ions, mechanical stress, light, high-energy rays, as well as other chemical substances and mold erosion, will gradually sticky, hardened brittle or cracking. This physical and mechanical properties decline over time, the phenomenon of reduced elasticity is called Kuzeeka mawakala .
Antioxidants za mpira zinaweza kugawanywa katika vizazi vitatu .
Kizazi cha 1: antioxidant D (PBN) na antioxidant A (PBA)
Kizazi cha 2: TMQ (RD)
Kizazi cha 3: IPPD (4010na) na 6PPF (4020)