Tristearyl Phosphate
molecular structure · PubChem
AKA: Trioctadecyl phosphate, 4889-45-6, Phosphoric acid, Tristearyl ester, Trioctadecyl ester
Plant-Derived
Cleanser
Not Clean
The CIR Expert Panel concluded the following 28 alkyl phosphates are safe in the present practices of use and concentration in cosmetics when formulated to be non-irritating...Tristearyl Phosphate...
Formula
C54H111O4P
Mol. Weight
855.40
CAS #
4889-45-6
Form
Powder
Functions
Plasticiser
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Surfactant Cleansing
Lifts away dirt and oil
Adds flexibility
Traditional Use
A synthetic phosphate ester developed in the 20th century for use as an emollient and conditioning agent in cosmetics. No traditional use history.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️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