Science
Mechanism of Action
This ingredient is composed of three-dimensional siloxane polymers and oligomers, forming cage structures that create a resilient yet flexible film on the skin's surface. This film helps to maintain skin integrity and provides a smooth canvas. Beyond film formation, it enhances product texture, imparts a silky feel, and can absorb excess oil. Its unique structure also contributes to a soft-focus effect, temporarily diminishing the appearance of fine lines, and functions as a gentle cleansing agent that does not exploit surface-active properties detrimental to the stratum corneum.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polysilsesquioxanes generally exhibit robust thermal and chemical stability, making them suitable for a wide range of formulation conditions. Their large molecular volume ensures minimal skin penetration.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Trimethylpentyl Polysilsesquioxane is safe for cosmetic use under current practices. Acute oral toxicity tests report an LD50 greater than 5000 mg/kg. Dermal irritation studies in rabbits at 100% concentration showed only very slight to transient erythema (Primary Irritation Index 0.30-0.78), resolving within 7 days, thereby alleviating concerns about local dermal irritation and sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Trimethylpentyl Polysilsesquioxane is a valuable ingredient for enhancing cosmetic elegance, delivering a silky skin feel, and providing a temporary soft-focus effect, all while demonstrating a strong safety profile and broad skin compatibility.
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References
Sources