Trioleyl Phosphate
AKA “Hostaphat KO 300, 3305-68-8, UNII-04N84W7M6Y, 04N84W7M6Y, NIKKOL TOP-0, EINECS 221-983-4, 9-Octadecen-1-ol, phosphate (3:1), (Z, Z, Z)-, 9-OCTADECEN-1-OL, PHOSPHATE (3:1), (9Z, 9'Z, 9''Z)-, 1, 1', 1''-PHOSPHATE
Emollient
Ingredient Facts
Trioleyl phosphate
AKA: Hostaphat KO 300, 3305-68-8, UNII-04N84W7M6Y, 04N84W7M6Y, NIKKOL TOP-0, EINECS 221-983-4, 9-Octadecen-1-ol, Phosphate (3:1), (Z, Z, Z)-, 9-OCTADECEN-1-OL, PHOSPHATE (3:1), (9Z, 9'Z, 9''Z)-, 1, 1', 1''-PHOSPHATE
Emollient · Emollient · EWG: 4
Synthetic
Emollient
Skin Conditioner
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...Trioleyl Phosphate...
Effective at 2.11%
Formula
C54H105O4P
Mol. Weight
849.40
CAS #
3305-68-8
Form
Powder
See origin →
Functions
Plasticiser
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Locks In Moisture
Traditional Use
A modern synthetic ester developed as an emollient and conditioning agent for cosmetics. Designed to improve skin feel and product stability in contemporary formulations.
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
Concentration Guide
0.02%
4.2%
0%6%
Effective Range
CIR reported use: 0.02-4.2
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR