Ca-Zn Stabilizer, short for Calcium – Zinc Stabilizer, is Lead-free thermal stabilization systems formulated for Polyvinyl chloride (PVC) processing, typically incorporating calcium and zinc carboxylates alongside selected co-stabilizers and functional additives. Their stabilization mechanism involves complementary reactions in which zinc compounds interact with thermally labile chlorine sites along PVC molecular chains, while calcium compounds neutralize Hydrogen chloride (HCl) released during thermal processing and contribute to zinc chloride management. Because accumulated zinc chloride can accelerate PVC dehydrochlorination, the selection and balance of calcium-zinc components, secondary stabilizers, and HCl scavengers are critical to achieving sustained thermal stability. Properly engineered Ca-Zn systems provide controlled initial coloration, extended processing stability, and consistent performance across rigid and flexible PVC formulations. Their lead-free composition has established them as an important alternative to conventional Lead-based stabilizers in applications requiring compliance with relevant chemical and environmental regulations.