C26-28 Alkyldimethylsilyl Polypropylsilsesquioxane
AKA “Silicone Resin, Polypropylsilsesquioxane
Ingredient
Ingredient Facts
C26-28 alkyldimethylsilyl polypropylsilsesquioxane
AKA: Silicone Resin
Ingredient · Film Forming · EWG: 4
Synthetic
Occlusive
Silicone
Not Clean
C26-28 Alkyldimethylsilyl Polypropylsilsesquioxane is a cosmetic ingredient used as film forming, viscosity controlling. Assessed as safe by the CIR.
CAS #
-
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.
Viscosity Controlling
Creates Protective Barrier
Controls Viscosity
Creates protective layer
Controls product thickness
Traditional Use
A complex silicone-based polymer developed in the late 20th century for advanced cosmetics. Used as a texturizing and suspending agent in sophisticated skincare and makeup.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR