Aluminum Isostearate

Aluminum Isostearate 1
AKA: 72277-75-9, Isooctadecanoic acid, Aluminum salt, Aluminum isostearate [INCI], Isostearic acid, Aluminum;16-methylheptadecanoate
Plant-Derived
Emulsifier
Not Clean
Isostearic acid, aluminum salt
Formula
C54H105AlO6
Mol. Weight
877.40
CAS #
72277-75-9
Form
Wax
Functions
Anticaking
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Opacifying
Viscosity Controlling
Prevents Clumping
Stabilizes Emulsion
Adds Opacity
Controls Viscosity
Keeps product blended
Creates creamy opacity
Controls product thickness
Traditional Use
Synthetic aluminum salt developed in the 20th century as a thickening and emulsifying agent for cosmetics. Created to replace natural waxes and improve product stability in creams and ointments.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR