Milliken’s AOX is a reactive, polymeric carbon-centered radical scavenger that protects thermoset polymers from oxidation/degradation. It is effective at low levels in polyurethanes, where exposure to high temperatures during processing causes degradation and discoloration. Unlike most conventional stabilizers, this antioxidant reacts into urethane systems resulting in significantly lower volatility, migration, bloom, and plate-out. In addition, most hindered phenols and hindered amines cause yellowing when the urethane is exposed to nitrous oxide gas. Milliguard does not cause this problem.