Corrosion is a natural chemical or electrochemical process in which materials—mostly metals—deteriorate due to reactions with environmental elements such as oxygen, moisture, chemicals, salts, or pollutants. It typically leads to rust, weakening, material loss, and surface degradation.

Vapour Corrosion Inhibitors (VCIs) are specialized chemical compounds designed to protect metal surfaces from rust and corrosion without the need for direct application. When incorporated into packaging materials such as films, papers, sachets, or masterbatches, VCIs release protective vapours that form a molecular-level barrier on metallic surfaces, preventing oxidation even in harsh environments.