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HYDROGENATED STYRENE/ISOPRENE COPOLYMER.

Valuable CAS 68648-89-5 / VISCOSITY CONTROLLING

Hydrogenated Styrene/Isoprene Copolymer is a versatile polymer primarily functioning as a film-forming agent to enhance moisture retention. It also improves formula aesthetics by controlling viscosity and stabilizing emulsions. Its large molecular structure ensures it acts topically without skin penetration.

Summary

film-former viscosity increasing agent emulsion stabilizer opacifying agent water-repelling agent suspending agent moisture retention

Science

Mechanism of Action

This ingredient functions by creating a breathable, non-occlusive film on the skin's surface, which effectively helps to lock in moisture and provide water-repelling properties. Due to its significant molecular size, it remains on the skin's outer layers without absorption. Within formulations, it acts as an opacifying and viscosity-controlling agent, assisting in suspending other ingredients and stabilizing water-in-oil emulsions.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Hydrogenation enhances its thermal stability, weather resistance, and oxidative durability. It is soluble in organic solvents such as alcohol, ether, methanol, acetone, and carbon disulfide, and sparingly soluble in water. It is an effective stabilizer for water-in-oil (W/O) emulsions.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
4.2%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Hydrogenated Styrene/Isoprene Copolymer is safe for use in cosmetics. This determination is supported by its large molecular size, which suggests a lack of skin absorption, and negative results observed in toxicity tests. Typical usage concentrations in cosmetic products range from 0.89% to 4.2%.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Hydrogenated Styrene/Isoprene Copolymer is a valuable and safe ingredient, offering formulation stability, enhanced texture, and effective moisture retention through its breathable film-forming properties, suitable for all skin types.

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