Oleth-100
AKA “PEG-100 oleyl ether, polyoxyethylene oleyl ether, UNKNOWN
Surfactant
Ingredient Facts
Oleth-100
AKA: PEG-100 oleyl ether, Polyoxyethylene oleyl ether, UNKNOWN
Surfactant · Cleansing · EWG: 2
Synthetic
Cleanser
Clean
Oleth-100 is the polyethylene glycol ether of Oleyl Alcohol
Effective at 9.03%
CAS #
-
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.
Cleansing Surfactant
Removes Impurities
Traditional Use
A synthetic polyethylene glycol ether derived from oleyl alcohol with a higher ethoxylation level than Oleth-10, developed as a solubilizer and emulsifier for cosmetic formulations requiring enhanced stability.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.06%
18.0%
0%25%
Effective Range
CIR reported use: 0.1-18 | 0.3-10 | 1-4 | 0.06-10
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR