Zinc benzoate is indeed used as a PVC (polyvinyl chloride) stabilizer. PVC is susceptible to degradation when exposed to heat and light over time, leading to a reduction in its mechanical properties and discoloration.

Zinc benzoate functions as a heat stabilizer and is particularly effective in PVC applications where resistance to discoloration is important. It helps prevent the breakdown of PVC polymer chains when exposed to high temperatures, thus extending the material’s lifespan and maintaining its mechanical properties.

Stabilizers like zinc benzoate work by capturing and neutralizing the free radicals generated during PVC degradation processes, thereby preventing further degradation reactions. They can also act as antioxidants, protecting PVC from oxidative degradation.

Zinc benzoate is often used in combination with other stabilizers, such as calcium/zinc stabilizers or organic-based stabilizers, to provide a comprehensive stabilization system that addresses various degradation mechanisms and environmental conditions.

Overall, zinc benzoate plays a valuable role as a stabilizer in PVC formulations, contributing to the durability, performance, and appearance of PVC products in a wide range of applications.