Science
Mechanism of Action
This copolymer functions by creating a continuous, ultra-thin film on the skin's surface, which improves product adherence and establishes a physical barrier against external factors such as chemicals, UV radiation, and pollution. Additionally, it serves as an effective oil thickener to increase the viscosity of oil-containing cosmetic formulations, and can also act as an opacifying agent to reduce formulation transparency.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient is oil-soluble and integrates into the oil phase effectively with heat application, typically between 100-110°C. For optimal stability, store in a tightly closed container at room temperature, protected from direct sunlight or heat, ensuring a shelf life of at least 3 years (referring to the hydrogenated form).
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Styrene/Methylstyrene/Indene Copolymer is safe for use in cosmetics under current concentrations and practices. Due to its large molecular size, percutaneous absorption is not anticipated. Any detectable levels of residual styrene monomer are considered to be substantially below levels of concern.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A valuable polymeric ingredient, Styrene/Methylstyrene/Indene Copolymer effectively enhances product texture and forms a protective, non-absorbing film on the skin, making it beneficial for various oil-based cosmetic applications with a low irritancy potential.
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