Isononyl Isononanoate

Isononyl Isononanoate 1
AKA: 7-methyloctyl 7-methyloctanoate, 42131-25-9, WE(8:0(7Me)/8:0(7Me)), Isononanoicacid, Isononyl ester (9CI), CHEBI:196213
Synthetic
Skin Conditioner
Synthetic
Clean
The CIR Expert Panel concluded that the alkyl esters, listed subsequently, are safe in the present practices of use and concentration described in this safety assessment when formulated to be non-irritating.
Effective at 32.02%
Formula
C18H36O2
Mol. Weight
284.50
CAS #
59219-71-5, 42131-25-9
Form
Liquid
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.
Reduces Static
Softens & Smooths
Conditions Skin
Reduces Flyaways
Traditional Use
This does not appear to be a valid ingredient designation; unable to provide historical use information.
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Concentration Guide
0.03%
64.0%
0%90%
Reported use
CIR reported use: 0.07-4 | >0.1-25 | 0.07-53 | 0.03-64
Regulatory Status
USAunder review
CANADA✔ permitted
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR