PEG-4 Sorbitan Triisostearate
AKA “Polyethylene Glycol 4 Sorbitan Triisostearate
Surfactant
Ingredient Facts
Peg-4 sorbitan triisostearate
AKA: Polyethylene Glycol 4 Sorbitan Triisostearate
Surfactant · Emulsifying · EWG: 4
Plant-Derived
Cleanser
Emulsifier
Not Clean
Sorbitan, poly(oxy-1,2-ethanediyl) derivs. triisooctadecanoates, (4 mol EO average molar ratio)
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.
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
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
USApermitted
CANADApermitted
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR