Octoxynol-9 Carboxylic Acid
AKA “24-Octaoxahexacosanoic acid, EINECS 246-867-0, PEG-9 Octyl phenyl ether carboxylic acid, RefChem:856063, 24-octaoxahexacosanoic acid, 24-OCTAOXAHEXACOSANOIC ACID, 24-octaoxahexacosan-1-oic acid”
Synthetic
Ingredient Facts
Octoxynol-9 carboxylic acid
AKA: 24-Octaoxahexacosanoic acid, EINECS 246-867-0, PEG-9 Octyl phenyl ether carboxylic acid, RefChem:856063, 24-octaoxahexacosanoic acid, 24-OCTAOXAHEXACOSANOIC ACID, 24-octaoxahexacosan-1-oic acid
Synthetic · Cleansing · EWG: 4
Synthetic
Cleanser
Emulsifier
Synthetic
Clean
A gentle cleansing agent that helps remove oil and dirt from skin while maintaining softness. Works to keep formulas stable and effective.
Formula
C32H56O11
Mol. Weight
616.80
CAS #
25338-58-3
Form
Liquid
State
Solid
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
Removes Impurities
Traditional Use
A derivative of octoxynol-9 created by introducing a carboxylic acid functional group. Used in cosmetics as an emulsifier with enhanced properties for specific formulation needs.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Mild Irritant
Regulatory Agencies
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR