Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer

Silicone Quaternium-16/Glycidoxy Dimethicone Crosspolymer is a synthetic polymer derived from silicone chemistry. It belongs to a class of conditioning agents designed to coat and protect hair fibres, combining both silicone and quaternary ammonium components to enhance adhesion and performance.This ingredient is primarily used in hair care formulations rather than skincare. It functions as a conditioning and film-forming agent, depositing a protective layer on the hair surface to improve texture, shine, and manageability.

The ingredient works by forming a thin, continuous film along the hair shaft. The silicone component provides a hydrophobic (water-repellent) coating, whilst the quaternary ammonium groups help the polymer adhere firmly to the hair surface through electrostatic attraction.This dual mechanism means the conditioning benefits persist through washing and styling, rather than rinsing away immediately. The crosslinked polymer structure also helps it withstand heat and mechanical stress.

This ingredient is typically found in rinse-off hair conditioners, leave-in treatments, and styling products. When present in a formula, it usually remains on the hair after rinsing and builds up with repeated use. If you find your hair becomes weighed down over time, consider using a clarifying shampoo periodically to remove accumulated silicone deposits.

Silicone-based conditioning polymers are generally well-tolerated and have a long safety history in cosmetics. Some people report that silicone buildup on hair can occur with frequent use, though this is a cosmetic concern rather than a safety issue.