PEG-6 Isostearate ●
TL;DR. This ingredient is a nonionic emulsifier, co-emulsifier, and solubilizer, often used to help oils, fragrances, and oily actives disperse into water-based or rinse-off formulas. It can also improve slip and mildness in cleansing systems.
What does PEG-6 Isostearate do in a cosmetic formula?
This ingredient is a nonionic emulsifier, co-emulsifier, and solubilizer, often used to help oils, fragrances, and oily actives disperse into water-based or rinse-off formulas. It can also improve slip and mildness in cleansing systems.
Is PEG-6 Isostearate clean?
From a clean-beauty perspective, this ingredient has friction because it is made through ethoxylation, a process associated with trace residual concerns that depend on purification quality. It is generally considered low-irritation in finished formulas, but it is not a favorite in stricter clean frameworks.
Is PEG-6 Isostearate sustainable?
This material is partly petrochemical-derived and partly fatty-acid-derived, with the fatty portion commonly linked to plant or synthetic routes. Its biodegradability is less straightforward than simple plant oils or fatty alcohols, and the synthetic hydrophilic portion reduces its sustainability profile.
Is PEG-6 Isostearate COSMOS-approved?
It is not permitted under COSMOS-natural or COSMOS-organic standards because the manufacturing route relies on ethoxylation, which the standard excludes. From a Green Chemistry lens, it offers useful performance at low levels but has weaker alignment due to nonrenewable inputs and processing-residue considerations.
How does PEG-6 Isostearate work chemically?
The molecule is a nonionic ester built from a branched C18 fatty acid and a short hydrophilic ether chain, giving it both oil affinity and water-dispersing behavior. Typical use is often around 1 to 5% as a co-emulsifier or solubilizer, and it is generally stable in mildly acidic to neutral formulas, while strong acid or alkaline conditions can slowly hydrolyze the ester bond.
Last updated 2026-05-15