Capryleth-4
AKA “Capryleth-4, PEG-4 Capryl Ether”
Surfactant
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Ingredient Facts
Capryleth-4
AKA: PEG-4 Capryl Ether
Surfactant · Cleansing · EWG: 4
Synthetic
Cleanser
Emulsifier
Not Clean
Poly(oxy-1,2-ethanediyl), .alpha.-octyl-.omega.-hydroxy- (4 mol EO average molar ratio)
CAS #
27252-75-1
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.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Removes Impurities
Mixes Oil & Water
Traditional Use
A synthetic non-ionic surfactant created in the mid-20th century by ethoxylating caprylic acid (a naturally occurring fatty acid). Used as an emulsifier and solubilizer 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 Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR