C26-28 Alkyldimethylsilyl Polypropylsilsesquioxane
AKA “Silicone Resin, Polypropylsilsesquioxane
Synthetic
Ingredient Facts
C26-28 alkyldimethylsilyl polypropylsilsesquioxane
AKA: Silicone Resin
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Occlusive
Skin Conditioner
Silicone
Synthetic
Clean
Science: Functions: Film Forming, Viscosity Controlling Safety Ratings: CIR: Safe as used
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
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Smoothing
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
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR