Polypropylsilsesquioxane
AKA “PPSX, Polypropylsilsesquioxane”
Ingredient
Ingredient Facts
Polypropylsilsesquioxane
AKA: PPSX
Ingredient · Film Forming · EWG: 1
Synthetic
Occlusive
Silicone
Clean
Polymer formed by hydrolysis and condensation of propyltrichlorosilane
CAS #
36088-62-7
Form
Powder
See origin →
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Creates Protective Barrier
Traditional Use
A synthetic silicone-based polymer developed in the late 20th century for cosmetics. Designed to provide lightweight texture, slip, and mattifying properties as a modern alternative to talc and mineral powders.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
C26-28 Alkyldimethylsilyl Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
Polypropylsilsesquioxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
Polypropylsilsesquioxane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Verified Jun 2026
Data: CosIng · EWG · CIR