C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane
AKA “Silicone Resin, Polypropylsilsesquioxane
Ingredient
Ingredient Facts
C30-45 alkyldimethylsilyl polypropylsilsesquioxane
AKA: Silicone Resin
Ingredient · Film Forming · EWG: 4
Synthetic
Occlusive
Silicone
Not Clean
C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane is a cosmetic ingredient used as film forming. 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.
Creates Protective Barrier
Traditional Use
A modern silicone polymer developed for the cosmetics industry in the late 20th century to provide enhanced conditioning, smoothing, and anti-stick properties in makeup and skincare products.
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