PEG-90 Diisostearate
AKA “Polyethylene glycol 90 diisostearate
Ingredient
Ingredient Facts
Peg-90 diisostearate
AKA: Polyethylene glycol 90 diisostearate
Ingredient · Cleansing · EWG: 4
Plant-Derived
Cleanser
Not Clean
Poly(oxy-1,2-ethanediyl), .alpha.-(1-oxo-16-methylheptadecyl)-.omega.-[(1-oxo-16-methylheptadecyl)oxy]- (90 mol EO average molar ratio)
Form
Liquid
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Removes Impurities
Traditional Use
A synthetic emulsifier developed in the mid-20th century combining polyethylene glycol with isostearic acid (a branched form of stearic acid). Created to provide stable, mild emulsification for modern cosmetic and personal care 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
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR