Anti-Yellowing Strategies for Preventing Discoloration in Molded Polyurethane Shoe Parts 🧠 Introduction: The Golden Glow That Isn’t So Golden Polyurethane (PU) has long been a darling of the footwear industry, celebrated for its versatility, durability, and comfort. From sleek soles to cushiony midsoles, molded polyurethane parts are ubiquitous in modern shoe design. But even this...