STEARETH-10
Steareth-10 is an ether of stearyl alcohol linked to ten ethylene oxide units, and it appears on labels as STEARETH-10. This combination joins a long end that mixes more readily with oily materials to an ethoxylated part that has an affinity for water, giving it the character of a non-ionic surfactant.
STEARETH-10: what it is
Steareth-10 is an ether of stearyl alcohol linked to ten ethylene oxide units, and it appears on labels as STEARETH-10. This combination joins a long end that mixes more readily with oily materials to an ethoxylated part that has an affinity for water, giving it the character of a non-ionic surfactant.
It differs from stearyl alcohol itself: the latter is a fatty alcohol, whereas steareth-10 has an ethoxylated sequence attached to that chain. The number 10 refers to the ten units in that sequence in the substance description. This is why it is better suited than stearyl alcohol alone to systems that bring water and oil together.
STEARETH-10: what it does in cosmetics
In creams, lotions and other products with water and oil phases, steareth-10 helps disperse the two kinds of ingredients into a more even mixture. In practical terms, its emulsifying action helps oil and water resist separating during use and supports a product that comes out with a uniform texture.
In cleansing preparations, its surfactant action helps water spread over oily residue and makes rinsing easier. Its refatting role relates to formulas designed for a less stripped feel after cleansing by incorporating lipid materials into the preparation; it does not mean that steareth-10 on its own moisturises or treats the skin.
STEARETH-10: conditions and care
The Cosmetic Ingredient Review assessed alkyl PEG ethers as a group and found them safe for cosmetic use when the formulation is non-irritating. That conclusion does not set one concentration for steareth-10 or replace assessment of the finished product.
Products containing this ingredient
See which products include it and the name used in each composition.
