Potassium C11-15 Alkyl Phosphate
AKA “Anionic surfactant
Surfactant
Ingredient Facts
Potassium c11-15 alkyl phosphate
AKA: Anionic surfactant
Surfactant · Cleansing · EWG: 1
Synthetic
Cleanser
Clean
Potassium salt of the phosphoric ester of C11-15 alcohol
CAS #
90506-45-9; 17026-85-6; 19035-79-1; 84861-79-0; 190454-07-0; 39322-78-6
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.
Cleansing Surfactant
Removes Impurities
Traditional Use
A synthetic surfactant and emulsifier developed in the mid-20th century for modern cosmetics. No traditional use; created to replace plant-based and animal-derived emulsifiers with standardized synthetic alternatives.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
1
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR