Science
Mechanism of Action
As a poly(2-hydroxyethyl methacrylate), or pHEMA, this polymer is inherently hydrophilic, enabling it to readily form a hydrogel upon contact with water. Its capacity to absorb between 10% and 600% of its dry weight in water allows it to swell and create a stable, gel-like structure. In cosmetic applications, it establishes a uniform film on the skin's surface, contributing to an enhanced sensorial experience with a smooth and velvety texture. When present as polymer microspheres, it can scatter incident light, thereby creating a diffused, soft-focus, or blurring visual effect. The presence of multiple hydroxyl groups within its molecular structure facilitates broad interaction with other ingredients.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PHEMA hydrogels exhibit considerable mechanical strength and maintain stability across a wide pH range, specifically from 1 to 13. This robustness is attributed to their inherently stable cross-linking structures. Furthermore, the polymer demonstrates solubility in ethanol, with documented concentrations up to 120 mg/mL.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Polyhydroxyethylmethacrylate is safe for use in cosmetics when formulated to be non-irritating and applied within current practices and concentrations. The FDA highlights its biocompatibility by permanently listing specific Poly(Hydroxyethyl Methacrylate)-dye copolymers as exempt from certification for coloring medical devices such as contact lenses, with usage restricted to the minimum amount required for the intended coloring effect.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyhydroxyethylmethacrylate is a valuable polymer for skincare formulations, offering advanced textural enhancement and film-forming properties with a robust safety profile and broad skin compatibility.
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