Science
Mechanism of Action
This copolymer functions as a rheology modifier, creating a dynamic network within the cosmetic matrix. Its polyethylene glycol components are central to its ability to modulate a formulation's viscosity, effectively acting as a consistency enhancer. This control ensures a refined product feel and consistent performance without direct interaction with skin's biological processes.
Research
Clinical Evidence
Low confidence2.5%
Transparency
Dusting Analysis
This ingredient primarily serves as a viscosity controlling agent, a functional role within the formulation, rather than a dermatologically active compound. Therefore, concerns regarding 'dusting' for skin efficacy are not applicable.
The Formula
Formulation
Stability
Polyethylene glycols, key components of this copolymer, are recognized for good skin tolerance and resistance to microbial degradation, which may reduce the need for additional preservatives. Solubility diminishes as the molar mass of polyethylene glycols increases.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed STEARETH-100/PEG-136/HDI Copolymer safe for use in cosmetics. Tests demonstrate it is non-irritating to rabbit eyes and skin, even at a 100% concentration, and exhibits a low oral toxicity with an LD50 greater than 10,000 mg/kg in rats. Its large molecular weight suggests minimal to no transdermal absorption. The highest reported concentration in cosmetic applications is 2.5%. Trace amounts of residual Hexamethylene Diisocyanate (HDI) are below detection limits at temperatures up to 150°C, and 1,4-dioxane, a potential byproduct, can be controlled through purification.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This copolymer is a valuable formulation enhancer, safely controlling product viscosity to improve texture and consumer experience across a wide range of skincare products.
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