Widely used as a secondary antioxidant and phosphite-based stabilizer in polymer systems, this compound effectively prevents oxidative degradation during processing and extends the service life of plastics. It is commonly employed in polyolefins, such as polyethylene and polypropylene, to protect against heat and shear stress during extrusion, molding, and other high-temperature processing methods. Its ability to decompose hydroperoxides and neutralize acidic byproducts makes it valuable in maintaining color stability and preventing polymer embrittlement. It is also used in conjunction with primary antioxidants like hindered phenols for synergistic stabilization. Applications span across films, fibers, molded parts, and wire & cable compounds where long-term thermal and color stability are critical. Additionally, it finds use in adhesives, elastomers, and some engineering plastics requiring enhanced processing stability.