PEG-10 Isostearate ●
TL;DR. This ingredient is a nonionic emulsifier and solubilizer used to help oils, pigments, and lipophilic actives disperse evenly in water-based or mixed-phase formulas.
What does PEG-10 Isostearate do in a cosmetic formula?
This ingredient is a nonionic emulsifier and solubilizer used to help oils, pigments, and lipophilic actives disperse evenly in water-based or mixed-phase formulas.
Is PEG-10 Isostearate clean?
From a clean beauty perspective, this ingredient has friction because it is made through ethoxylation and can require tight control for trace 1,4-dioxane and residual ethylene oxide. It is not a common sensitizer at typical use levels, but many stricter standards flag this chemistry class.
Is PEG-10 Isostearate sustainable?
This material is typically made from a branched fatty acid source combined with petrochemical-derived ethoxylation chemistry. It is expected to break down more readily than persistent silicones, but its fossil-derived portion and processing profile weaken its sustainability case.
Is PEG-10 Isostearate COSMOS-approved?
It is not permitted under COSMOS-natural or COSMOS-organic because the manufacturing route relies on ethoxylation, which is excluded by that standard. Its Green Chemistry alignment is limited by nonrenewable feedstock inputs and purification needs, even though it can reduce the need for harsher solubilization systems.
How does PEG-10 Isostearate work chemically?
The molecule is a nonionic fatty ester with a branched C18 lipophilic tail and an average chain length of about 10 oxyethylene units, giving it oil-water interfacial activity. It is generally used at low single-digit percentages as a solubilizer or emulsifier, and formulators monitor peroxide value, residual 1,4-dioxane, and compatibility with electrolytes or high-pH systems.
Last updated 2026-09-02