Propylene Glycol Diisononanoate
molecular structure · PubChem
AKA: 125804-17-3, 7-methyloctanoic acid;propane-1, 2-diol, 7-Methyloctanoic acid--propane-1, 2-diol (2/1)
Synthetic
Emollient
Skin Conditioner
Not Clean
Isononanoic acid, 1-methyl-1,2-ethanediyl ester
Effective at 1.0%
Formula
C21H44O6
Mol. Weight
392.60
CAS #
125804-17-3
Form
Powder
Functions
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
Synthesized in the late 20th century as a synthetic branched-chain ester. Created for use in modern cosmetics as a lightweight emollient and texture enhancer, designed to improve spreadability and skin feel.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
9.9e-05%
2.0%
0%14%
Reported use
CIR reported use: 0.000099-2
Regulatory Agencies
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR