No Image Available
C9-11 Pareth-4
AKA “Pareth-4, Nonionic Surfactant”
Surfactant
Ingredient Facts
C9-11 pareth-4
AKA: Nonionic Surfactant
Surfactant · Emulsifying · EWG: 4
Synthetic
Cleanser
Emulsifier
Not Clean
C9-11 Pareth-4 is a polyethylene glycol ether of a mixture of synthetic C9-11 fatty alcohols with an average of 4 moles of ethylene oxide
CAS #
-
Form
Liquid
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Mixes Oil & Water
Traditional Use
Synthetic surfactant derived from ethoxylated isoparaffin, developed in the mid-20th century. Used as a mild cleanser and emulsifier in personal care products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
C11-15 Pareth-40
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C12-13 Pareth-4
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C12-14 Sec-Pareth-40
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C12-15 Pareth-4
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C14-15 Pareth-4
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C20-40 Pareth-40
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C30-50 Pareth-40
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
C9-11 Pareth-4
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Development, Characterization and Skin Interaction of Capsaicin-Loaded Microemulsion-Based Nonionic Surfactant.
Duangjit S, Chairat W, Opanasopit P, Rojanarata T, Panomsuk S et al.
Biological & pharmaceutical bulletin, 2016
→
C11-15 Pareth-40
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Verified Jun 2026
Data: CosIng · EWG · CIR