Stearoxymethicone/Dimethicone Copolymer ●
TL;DR. This ingredient functions as a conditioning agent, film-former, and slip enhancer in skin, hair, and color cosmetics. It helps improve spread, reduce tack, add softness, and support water-resistant feel.
What does Stearoxymethicone/Dimethicone Copolymer do in a cosmetic formula?
This ingredient functions as a conditioning agent, film-former, and slip enhancer in skin, hair, and color cosmetics. It helps improve spread, reduce tack, add softness, and support water-resistant feel.
Is Stearoxymethicone/Dimethicone Copolymer clean?
From a clean-beauty lens, it has friction because many standards exclude persistent synthetic polymers and closely watch trace cyclic oligomers from manufacture. Skin irritation is generally low, so the concern is more standards alignment and residue profile than day-to-day tolerance.
Is Stearoxymethicone/Dimethicone Copolymer sustainable?
It is made from mineral-derived silicon chemistry combined with petrochemical carbon inputs, with energy-intensive processing. It is not readily biodegradable and can persist in wastewater solids and sediment.
Is Stearoxymethicone/Dimethicone Copolymer COSMOS-approved?
It is not permitted under COSMOS natural or organic standards because it is a synthetic organosilicon polymer. It scores weakly on Green Chemistry for renewable feedstocks and end-of-life biodegradation, although it is chemically inert and typically used at low levels.
How does Stearoxymethicone/Dimethicone Copolymer work chemically?
The molecule is a high-molecular-weight hydrophobic copolymer with a flexible Si-O backbone, methyl substitution, and C18 alkoxy side chains that add a waxy, oil-compatible character. Typical use is often about 0.1 to 5%, with good stability across normal cosmetic pH and heat processing, and it is usually added to the oil phase or pre-dispersed in compatible nonpolar emollients.
Last updated 2026-05-13