Science
Mechanism of Action
This ingredient functions as a surfactant by reducing the surface tension between liquids, allowing immiscible substances like oil and water to blend and form stable emulsions. In cleansing applications, it effectively aids in solubilizing and washing away lipophilic impurities and environmental particulates from the skin and hair.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The provided research data does not contain specific information regarding dusting properties or concentration thresholds for potential undesirable effects associated with this ingredient.
The Formula
Formulation
Stability
Sorbeth-40 Tetraisostearate exhibits stability at room temperature across a broad pH range from 2 to 12. However, it is susceptible to hydrolysis under highly acidic or alkaline conditions in the presence of water. Its emulsifying nature confirms its dispersibility in both aqueous and oil phases.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed polysorbates, including Sorbeth-40 Tetraisostearate due to its structural similarities, safe for use in cosmetics when formulated to be non-irritating. While a general maximum concentration of 25% was noted for a broader category of PEG Sorbitan/Sorbitol Fatty Acid Esters, a specific maximum for Sorbeth-40 Tetraisostearate was not identified. Formulators should be mindful of the potential for trace amounts of 1,4-dioxane, a by-product of the ethoxylation process, which can be mitigated through appropriate purification steps.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sorbeth-40 Tetraisostearate is a valuable surfactant, crucial for creating stable emulsions and effective cleansing formulations across a wide pH range, with a favorable safety profile.
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References
Sources