Polyurethane-9

Polyurethane-9 is a synthetic polymer derived from petrochemical sources. In skincare formulations, it functions as a film-forming agent and binder, creating a thin, flexible layer across the skin's surface.This ingredient is commonly used in cosmetic products to improve texture, enhance adherence of other components, and provide a subtle smoothing effect. It works by forming a cohesive film that helps other ingredients stay in place and can contribute to the overall feel and performance of a product.

Polyurethane-9 works by forming a flexible, semi-permeable film when applied to skin. This polymer chains link together to create a continuous network across the surface, which can help trap water and prevent moisture loss whilst remaining flexible enough to move with facial expressions.The film-forming mechanism also allows the ingredient to act as a binder in formulations, helping to stabilise emulsions and improve the overall coherence of the product texture.

Polyurethane-9 is used in rinse-off and leave-on formulations at varying concentrations depending on the desired film thickness and product type. When using products containing this ingredient, apply as directed by the product instructions. The polymer film will naturally shed with normal skin cell turnover and cleansing, so regular use is typically needed to maintain any benefit.

Polyurethane-9 is generally well-tolerated and widely used in cosmetic products. It is not known to be a significant skin sensitiser, though as with all ingredients, patch testing is recommended if you have particularly sensitive skin.