Hydrogenated Styrene/Butadiene Copolymer

What is Hydrogenated Styrene/Butadiene Copolymer?

Hydrogenated Styrene/Butadiene Copolymer is a synthetic polymer produced by polymerizing styrene and butadiene monomers, then hydrogenating to add hydrogen atoms and stabilize the structure. Derived from petrochemical sources, it appears in makeup, sunscreens, hair styling, and nail products. In formulations, it creates a thin, flexible film on skin or hair, boosting water resistance, product adhesion, and durability without greasiness. Simultaneously, it modifies viscosity to achieve ideal thickness, aiding even distribution, ingredient suspension, and overall stability. This dual role supports diverse product types, from long-wear foundations to hold-providing gels, while its saturated bonds reduce reactivity for broader compatibility in rinse-off and leave-on items.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Film former
Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Forms a protective film that enhances water resistance and product longevity on skin or hair.

Controls viscosity for smoother texture and better stability in formulations.

Supports non-comedogenic properties, suitable for acne-prone skin routines.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of long-wear makeup seeking transfer-resistant finishes.
Those with rare allergies to synthetic styrene-based polymers.
Individuals applying sunscreens or styling products needing water resistance.
People avoiding petrochemical-derived ingredients on principle.
People preferring stable, easy-to-apply cosmetic textures.
Individuals sensitive to film-forming agents in high concentrations.

Safety Notes

  • Considered low hazard in cosmetic concentrations by safety assessments.
  • Typically non-irritating and non-comedogenic based on formulation data.

Frequently Asked Questions about Hydrogenated Styrene/Butadiene Copolymer

What is Hydrogenated Styrene/Butadiene Copolymer used for?

It acts as a film former for water resistance and a viscosity controller for product texture in cosmetics.

Is it safe for daily skincare use?

Safety evaluations rate it low hazard when used as directed in formulations.

Does it cause irritation or acne?

Evidence shows low irritation potential and zero comedogenic rating.