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C20-40 Pareth-40
AKA “C20-40 Pareth-40, Pareth-40”
Synthetic
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Ingredient Facts
C20-40 pareth-40
Synthetic · Cleansing | Surfactant - Cleansing | Surfactant - Emulsifying · EWG: 4
Plant-Derived
Cleanser
Emulsifier
Synthetic
Clean
A gentle cleansing agent that helps remove makeup and impurities while keeping formulas smooth and blended.
CAS #
246538-83-0
Form
Liquid
Plant-Derived
Synthetic. Derived from petroleum-derived paraffin waxes and ethylene oxide, belonging to the polyethylene glycol ether family. Synthesized through ethoxylation of C20-40 paraffin waxes with ethylene oxide under catalytic conditions.
Function
Cleansing | Surfactant - Cleansing | Surfactant - Emulsifying
Benefits
Removes Impurities
Cleansing Surfactant
Emulsifier
Mixes Oil & Water
Traditional Use
A highly hydrophilic synthetic surfactant developed for cosmetics. Used as an emulsifier and solubilizer in water-based formulations.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe, Not a Sensitizer
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Feb 2026
Data: CosIng · EWG · CIR