Polyurethane-35

Polyurethane-35 is a synthetic polymer derived from petrochemical sources. In skincare formulations, it functions as a binding agent—helping to hold other ingredients together and maintain the structural integrity of a product over time.As a binder, this ingredient works behind the scenes rather than directly interacting with skin. It is used sparingly in skincare products (appearing in roughly 0.1% of formulations), where its primary role is to support formula stability and consistency rather than to deliver active skincare benefits.

Polyurethane-35 works by creating a polymer network within a formulation. This network acts like a scaffold, binding other components together and preventing them from separating. The polymer chains interlock with the surrounding formula matrix, creating a more cohesive product.This binding function is structural rather than therapeutic—it does not penetrate the skin or alter skin biology directly. Instead, it ensures that active ingredients remain evenly distributed and that the product maintains its intended consistency from first use to the last.

Polyurethane-35 is not an active ingredient that requires specific application technique. It works passively within your product, so simply use your skincare formula as directed by the manufacturer. Store products in a cool, dry place to help preserve formula stability over time.

Polyurethane-35 is generally well-tolerated and has a long history of safe use in cosmetics. It is not an irritant and does not typically trigger sensitivity responses.