Phosphite co-stabilizers are widely used in PVC formulations in combination with mixed metal stabilizers to enhance overall performance. Organic phosphites play a crucial role in protecting the properties of many polymers, performing a variety of functions, including maintaining transparency, preserving initial color, and reinforcing the effectiveness of primary antioxidants as thermal and processing stabilizers in polyolefins, elastomers, and engineering plastics. They also improve the service life, durability, and weatherability of plastics used in outdoor applications.
In addition to PVC, phosphite co-stabilizers are commonly incorporated into polyolefins, polyurethane, and other polymer resins to provide enhanced stability during processing and long-term performance. Their use ensures that polymers retain their mechanical properties, appearance, and functional integrity even under harsh thermal or environmental conditions.