Propanediol Diisostearate
AKA “Propanediol Isostearate Ester”
Synthetic
Ingredient Facts
Propanediol diisostearate
AKA: Propanediol Isostearate Ester
Synthetic · Emollient · EWG: 4
Varies With Manufacturer
Emollient
Skin Conditioner
Plant Oil
Synthetic
Clean
Science: Origin: Botanic/Natural | Functions: Skin Conditioning - Emollient Safety Ratings: CIR: Safe as used
CAS #
-
Form
Liquid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Viscosity Controlling
Locks In Moisture
Traditional Use
Developed in the late 20th century as a synthetic ester. Created as an emollient for cosmetic formulations to provide a silky, non-greasy feel.
Skin Types
●all-skin-types
Best For
Dryness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Verified Feb 2026
Data: CosIng · EWG · CIR