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Tristearyl Phosphate
AKA “Trioctadecyl phosphate, 4889-45-6, Phosphoric acid, tristearyl ester, trioctadecyl ester, 4KU600FQTM, EINECS 225-509-7, DTXSID7063637, RefChem:900580, DTXCID2040652”
Surfactant
Ingredient Facts
Tristearyl phosphate
AKA: Trioctadecyl phosphate, 4889-45-6, Phosphoric acid, Tristearyl ester, Trioctadecyl ester, 4KU600FQTM, EINECS 225-509-7, DTXSID7063637, RefChem:900580, DTXCID2040652
Surfactant · Cleansing · EWG: 4
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
See origin →
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
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
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR