Trimethylsiloxysilicate ●
TL;DR. This ingredient is a film-forming resin used to improve water resistance, transfer resistance, wear time, and pigment adhesion in makeup, sunscreen, and long-wear products.
What does Trimethylsiloxysilicate do in a cosmetic formula?
This ingredient is a film-forming resin used to improve water resistance, transfer resistance, wear time, and pigment adhesion in makeup, sunscreen, and long-wear products.
Is Trimethylsiloxysilicate clean?
From a clean-beauty perspective, it has low direct irritation potential but is often flagged because it is a synthetic persistent polymer. It commonly appears on restricted or not-accepted lists in standards that limit non-biodegradable film formers.
Is Trimethylsiloxysilicate sustainable?
This material is synthetically produced from mineral and petrochemical inputs and is not readily biodegradable. Its main sustainability concern is environmental persistence rather than high acute aquatic impact.
Is Trimethylsiloxysilicate COSMOS-approved?
This ingredient is not permitted under COSMOS-natural or COSMOS-organic standards because it falls outside the allowed raw-material categories. Its Green Chemistry fit is weak due to synthetic feedstocks, limited biodegradability, and persistence after rinse-off or product removal.
How does Trimethylsiloxysilicate work chemically?
The molecule is a highly crosslinked organosilicon network capped with methyl groups, which forms a rigid, water-resistant film as volatile carriers evaporate. It is often supplied as a dispersion or solution with 50 to 75% solids and used at roughly 1 to 10% active, especially in anhydrous or emulsion systems that need long wear.
Last updated 2026-05-13