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HYDROGEN DIMETHICONE/OCTYL SILSESQUIOXANE COPOLYMER.

Valuable CAS - / BINDING

This silicone copolymer forms a protective, non-greasy film on the skin, effectively reducing transepidermal water loss and shielding against environmental factors. It also significantly enhances product spreadability, imparts a luxurious silky texture, and serves as a valuable binder and anti-caking agent in complex cosmetic formulations.

Summary

Skin Protectant Film Former Texture Enhancer Spreadability Enhancer Binder Anti-Caking Agent UV Filter Enhancer

Science

Mechanism of Action

HYDROGEN DIMETHICONE/OCTYL SILSESQUIOXANE COPOLYMER establishes a hydrophobic barrier on the skin's surface. This protective film actively prevents exogenous substances from penetrating the stratum corneum and demonstrably reduces transepidermal water loss (TEWL). Its molecular structure also contributes to improved product spreadability, a distinctive silky sensory feel, and functions as both a binder and an anti-caking agent in various cosmetic applications; it may additionally confer UV resistance.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 The US FDA considers HYDROGEN DIMETHICONE/OCTYL SILSESQUIOXANE COPOLYMER a skin protector at low concentrations, citing its favorable safety profile. Its high molecular weight minimizes absorption into the skin, contributing to its non-irritating character when properly formulated.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

This silsesquioxane crosspolymer exhibits high stability and resistance to oxidation, contributing to extended product shelf life. While specific pH stability for this exact copolymer is not explicitly detailed, related dimethicone polymers typically demonstrate stability within a pH range of 5.5 to 8.5.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has thoroughly assessed polysilsesquioxanes, including Hydrogen Dimethicone/Octyl Silsesquioxane Copolymer, concluding they are safe for cosmetic use under current industry practices and concentrations. Its high molecular weight ensures minimal absorption into the skin or scalp, significantly mitigating potential for irritation or sensitization. Clinical studies on related dimethicone copolyols have further confirmed their non-irritating and non-sensitizing properties, even in concentrations up to 40% in aqueous solutions and undiluted. The FDA additionally recognizes it as a skin protector with good safety at low concentrations.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

HYDROGEN DIMETHICONE/OCTYL SILSESQUIOXANE COPOLYMER is a valuable multi-functional ingredient, offering robust skin protection, enhancing sensory aesthetics, and improving formulation stability with an exceptional safety profile suitable for all skin types.

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