Antioxidant Blends

Physical blends of stabilizers with different stabilization mechanisms are the state-of-the art today.  Blends of hindered phenols acting as hydrogen donors in combination with phosphites and/or thiosynergists acting as hydroperoxide decomposers have long been used to stabilize polymeric materials. Powerful hydroxylamines, which interrupt the oxidation cycle early by scavenging carbon centered radicals are often used in combination with phosphites when high performance processing stability is needed. These different antioxidant combinations are known to provide a synergistic effect.  In other words, the overall benefit of combining these antioxidants is greater than the impact of each chemistry individually.