Hydrogenated Styrene/Butadiene Copolymer

Hydrogenated styrene/butadiene copolymer is a synthetic polymer derived from the hydrogenation of styrene-butadiene block copolymers. It is a rubber-like material that has been chemically treated to improve stability and safety for cosmetic use.In skincare formulations, it serves two primary functions: it creates a thin, flexible film on the skin surface and helps control the viscosity (thickness) of the product itself. This makes it useful in products where a light, uniform texture and modest barrier properties are desired.

When applied to skin, hydrogenated styrene/butadiene copolymer molecules link together to form a flexible polymer film. This film sits on the skin surface rather than penetrating deeply, creating a light protective barrier.Within the formulation itself, the ingredient acts as a thickener and stabiliser, adjusting how the product flows and feels during application. Its elasticity means the film remains flexible and comfortable rather than feeling rigid or occlusive.

Use as directed in your product instructions. Since this ingredient is typically present at low concentrations and serves largely a textural and protective role, consistency of use matters more than frequency. Apply to clean skin and allow the product to dry fully for optimal film formation.

Hydrogenated styrene/butadiene copolymer is generally well-tolerated and is approved for cosmetic use in the EU and UK. Allergic contact dermatitis is rare but possible, as with any ingredient.