PEG-8/SMDI Copolymer ●
TL;DR. This ingredient is primarily a synthetic film-former and binder. It helps products create a flexible, wear-supporting layer on skin, lashes, brows, or hair, improving adhesion, hold, and water resistance.
What does PEG-8/SMDI Copolymer do in a cosmetic formula?
This ingredient is primarily a synthetic film-former and binder. It helps products create a flexible, wear-supporting layer on skin, lashes, brows, or hair, improving adhesion, hold, and water resistance.
Is PEG-8/SMDI Copolymer clean?
From a clean-beauty perspective, this ingredient has friction because it is a synthetic ethoxylated polymer and may require tight impurity controls for processing residues such as 1,4-dioxane and residual isocyanate-derived monomers. It is generally more of a standards and persistence concern than a common irritation concern in finished formulas.
Is PEG-8/SMDI Copolymer sustainable?
This material is typically petrochemical-derived and is not readily biodegradable. Its polymeric nature raises persistence concerns after rinse-off or disposal, especially compared with simpler biodegradable film-formers.
Is PEG-8/SMDI Copolymer COSMOS-approved?
It is not permitted under COSMOS-natural or COSMOS-organic standards. Its petrochemical origin, ethoxylated backbone, and limited biodegradability make it a poor fit with Green Chemistry preferences for renewable feedstocks, benign processing, and end-of-life breakdown.
How does PEG-8/SMDI Copolymer work chemically?
The molecule is a urethane-linked synthetic copolymer made from short polyether segments and diisocyanate-derived linking units, giving it flexible film-forming behavior. It is typically used at low levels as a performance polymer, and formulation attention centers on dispersion compatibility, film feel, water resistance, and supplier control of residual monomers and ethoxylation byproducts.
Last updated 2026-05-13