Isodeceth-5
AKA “Isodecyl alcohol ethoxylate, PEG-5 isodecyl ether
Synthetic
Ingredient Facts
Isodeceth-5
AKA: Isodecyl alcohol ethoxylate, PEG-5 isodecyl ether
Synthetic · Cleansing · EWG: 4
Synthetic
Cleanser
Emulsifier
Synthetic
Clean
Alcohols, C10-branched, ethoxylated (5 mol EO average molar ratio) Science: Functions: Surfactant - Cleansing, Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
Effective at 1.6%
CAS #
9002-92-0; 68439-50-9; 5274-68-0; 9004-95-9; 9005-00-9; 4536-30-5; 3055-93-4; 3055-94-5; 3055-95-6
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
Modern synthetic ethoxylated surfactant created for cosmetic applications as an emulsifier and solubilizer, developed to improve ingredient compatibility in complex formulations.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.2%
3.0%
0%4%
Effective Range
CIR reported use: 0.7-2 | 1-3 | 0.2-3
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR