A PVC stabilizer is a chemical additive added to polyvinyl chloride (PVC) to improve its thermal and mechanical properties. The PVC stabilizer protects PVC from decaying and oxidation and substantially improves its processing characteristics.

Without adding stabilizers, PVC becomes brittle and prone to cracking as the stabilizers significantly impact the strength of PVC material. Apart from it, the stabilizers also prevent the PVC from losing its color and maintain the aesthetics of PVC products.