Butylene Glycol Diisononanoate
AKA “Ester oil, Emollient ester”
Emollient
Ingredient Facts
Butylene glycol diisononanoate
AKA: Ester oil, Emollient ester
Emollient · Emollient · EWG: 4
Synthetic
Emollient
Skin Conditioner
Not Clean
Butylene Glycol Diisononanoate is the diester of butylene glycol and branched chain nonanoic acids
CAS #
-
Form
Powder
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 20th century as a synthetic ester emollient. Created to provide lightweight skin conditioning and improve product texture in modern cosmetic formulations.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR