Oleyl Ethyl Phosphate
AKA “Ethyl oleyl phosphate, ZP5C14RDAO, Ethyl oleyl hydrogen orthophosphate, UNII-ZP5C14RDAO, 10483-96-2, Oleyl ethyl phosphate [INCI], Phosphoric acid, monoethyl mono-(9Z)-9-octadecenyl ester, monoethyl mono-9-octadecenyl ester (Z)-, RefChem:168119
Surfactant
Ingredient Facts
Oleyl ethyl phosphate
AKA: Ethyl oleyl phosphate, ZP5C14RDAO, Ethyl oleyl hydrogen orthophosphate, UNII-ZP5C14RDAO, 10483-96-2, Oleyl ethyl phosphate [INCI], Phosphoric acid, Monoethyl mono-(9Z)-9-octadecenyl ester, Monoethyl mono-9-octadecenyl ester (Z)-, RefChem:168119
Surfactant · Cleansing · EWG: 4
Synthetic
Cleanser
Emulsifier
Not Clean
Phosphoric acid, monoethyl mono-9-octadecenyl ester (Z)-
Formula
C20H39O5P
Mol. Weight
390.50
CAS #
10483-96-2
Form
Powder
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.
Surfactant Cleansing
Surfactant Emulsifying
Moisturizing
Antimicrobial
Fights Acne
Lifts away dirt and oil
Mixes oil and water
Traditional Use
Developed as a synthetic phosphate ester in the 20th century. Used in cosmetics as an emulsifier and conditioning agent with no traditional use history.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR