Ceteareth-18
AKA “Ceteareth-18, PEG-18 Cetearyl Ether
Surfactant
Ingredient Facts
Ceteareth-18
AKA: PEG-18 Cetearyl Ether
Surfactant · Cleansing · EWG: 2
Plant-Derived
Cleanser
Emulsifier
Plant Oil
Clean
C16-18 alcohols, ethoxylated (18 mol EO average molar ratio)
Effective at 8.02%
CAS #
68439-49-6
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
Developed in the mid-20th century as a synthetic ethoxylated emulsifier derived from cetearyl alcohol. Created to stabilize oil-water mixtures in cosmetics and pharmaceuticals, with no traditional use history.
Skin Types
all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-2
medical-approval
pregnancy-nursing-safe
all-shades-safe
Concentration Guide
0.03%
16.0%
0%22%
Effective Range
CIR reported use: 0.03-16 | 0.09-0.3
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR