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HYDROGENATED BUTYLENE/ETHYLENE/STYRENE COPOLYMER.

Valuable / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

A versatile elastomer, Hydrogenated Butylene/Ethylene/Styrene Copolymer functions as a film-forming agent, creating a resilient, breathable barrier on the skin. It significantly enhances product texture as a viscosity controller and delivers emollient and conditioning benefits.

Summary

Viscosity Controlling Film-forming Skin Conditioning Emollient

Science

Mechanism of Action

This copolymer operates by forming a flexible, lightweight, and durable film on the skin's surface. This film not only improves product longevity and water resistance but also creates a breathable barrier that protects against environmental stressors and minimizes transepidermal water loss. Concurrently, it increases formulation viscosity, optimizing texture and consistency, while also acting as an emollient to soften and smooth the skin.

Research

Clinical Evidence

Medium confidence
Effective range 5–70%
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

No data indicates this ingredient is commonly 'dusted' or associated with adverse effects at specific concentration thresholds.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The ingredient is insoluble in water but readily dissolves in oil. It exhibits excellent thermal and UV stability, making it robust for diverse formulations. For optimal uniformity, it should be combined with other oil-phase ingredients, ideally at elevated temperatures, with nonpolar or less polar components added first. While generally compatible with most chemical ingredients, including cyclomethicone and phenyl trimethicone, some additions may lead to a decrease in gel viscosity. It is important to note its non-biodegradable nature for specific 'clean beauty' considerations.

Synergies

  • Cyclomethicone
  • Phenyl Trimethicone
  • Other oil-phase ingredients

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed its safety, along with other styrene and vinyl-type styrene copolymers, within current cosmetic use practices and concentrations. Its large molecular size renders significant skin penetration unlikely, thereby minimizing systemic exposure risk. While rare instances of skin irritation or allergic reactions have been noted for individuals with highly sensitive skin, it is generally considered non-irritating and non-sensitizing.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
No Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Hydrogenated Butylene/Ethylene/Styrene Copolymer is a valuable multifunctional ingredient, offering significant improvements in formulation stability, texture, water resistance, and skin conditioning with a strong safety profile and broad skin compatibility.

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