PEG-4 Sorbitan Triisostearate
AKA “Polyethylene Glycol 4 Sorbitan Triisostearate
Synthetic
Ingredient Facts
Peg-4 sorbitan triisostearate
AKA: Polyethylene Glycol 4 Sorbitan Triisostearate
Synthetic · Emulsifying · EWG: 4
Plant-Derived Synthetic
Cleanser
Emulsifier
Skin Conditioner
Synthetic
Clean
Sorbitan, poly(oxy-1,2-ethanediyl) derivs. triisooctadecanoates, (4 mol EO average molar ratio) Science: Origin: Botanic/Natural | Process: Ethoxylation | Functions: Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
CAS #
9005-67-8
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emulsifier
Locks In Moisture
Wound Healing
Antioxidant Protection
Mixes Oil & Water
Traditional Use
Synthetic emulsifier combining PEG with sorbitan and branched stearic acid esters, developed mid-to-late 20th century. Designed for improved stability and conditioning in cosmetic formulations.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe w/Qualifications
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
CANADApermitted
Regulatory Agencies
Verified Feb 2026
Data: CosIng · EWG · CIR