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C20-40 Pareth-10
AKA “C20-40 Pareth-10, Pareth-10”
Surfactant
Ingredient Facts
C20-40 pareth-10
Surfactant · Cleansing · EWG: 1
Synthetic
Cleanser
Emulsifier
Clean
Alcohols, C20-40, ethoxylated (10 mol EO average molar ratio)
CAS #
246538-83-0
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 developed in the mid-20th century. Used as an emulsifier and solubilizer in cosmetic formulations.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR